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  1. #1
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    1TB : TOSHIBA DT01ACA100 or Seagate ST1000DM003 ?

    Hi,

    i want to buy four hardware to do centos software raid 10 on x9scl+-f/e3 1230,

    i find the two HDD,do you have any experience with them ?

    because their cache are 32MB and 64MB,

    im not sure if it is very important ?


    thanx

  2. #2
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    I only use Seagate hard drives on all my servers. I have only had 1 fail since 2007, that failed slowly and gave me error messages for a long time, so I replaced it before any data was ever lost.
    PS. I have over 40 servers in the data center.
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  3. #3
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    Quote Originally Posted by ttgt View Post
    Hi,

    i want to buy four hardware to do centos software raid 10 on x9scl+-f/e3 1230,

    i find the two HDD,do you have any experience with them ?

    because their cache are 32MB and 64MB,

    im not sure if it is very important ?


    thanx
    well, neither is exactly ideal choice because they are sill desktop drives that are not rated for 24x7 production.

    try seagate 1TB constellation CS (ST1000NC001) which can be had for under $100:
    http://www.ecost.com/p/Seagate-Hard-...67~pdp.iaddjjg
    it has SATA-III 6G/s 7200rpm 64M buffer. sure, it costs $20-$25 more, but at least it comes with 3-year Seagage warranty, let alone it's rated for 24x7 usage on production server.

    WD 1TB RE4 is another choice for 24x7 production even if you don't use them on hardware RAID card. however, it's SATA-II 3G/s based, and it costs in $115 range, but it does have 5-year warranty from WD.
    Last edited by cwl@apaqdigital; 02-09-2013 at 12:04 PM.
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  4. #4
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    Hi,
    Both our constellations and WD RE4s have 5 year warranty with them, but I guess it depends who you purchase them from.

    Quote Originally Posted by cwl@apaqdigital View Post
    well, neither is exactly ideal choice because they are sill desktop drives that are not rated for 24x7 production.

    try seagate 1TB constellation CS (ST1000NC001) which can be had for under $100:
    http://www.ecost.com/p/Seagate-Hard-...67~pdp.iaddjjg
    it has SATA-III 6G/s 7200rpm 64M buffer. sure, it costs $20-$25 more, but at least it comes with 3-year Seagage warranty, let alone it's rated for 24x7 usage on production server.

    WD 1TB RE4 is another choice for 24x7 production even if you don't use them on hardware RAID card. however, it's SATA-II 3G/s based, and it costs in $115 range, but it does have 5-year warranty from WD.
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  5. #5
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    the x9scl+-f has only SATA-II 3G/s,if i buy SATA-III 6G/s HDD,does it have any benefit ? thanx

  6. #6
    Quote Originally Posted by ttgt View Post
    the x9scl+-f has only SATA-II 3G/s,if i buy SATA-III 6G/s HDD,does it have any benefit ? thanx
    On spinning disk I don't think it would make any differences, the Seagate ST1000DM003 data transfer rate can't even reach anywhere near 3Gb/s.
    -

  7. #7
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    I'd go for the bigger cache if all else equal. 6G vs 3G doesn't matter for spin disk. In the end, I think reliability/warranty is the most important for spin disks.
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  8. #8
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    Quote Originally Posted by JD0192 View Post
    Hi,
    Both our constellations and WD RE4s have 5 year warranty with them, but I guess it depends who you purchase them from.
    actually, Constellation CS has 3-year warranty from Seagate. but Constellation ES.2 (64M buffer)/ES.3 (128M buffer) are covered for 5 years, but also cost 50% more than CS models at the same size.
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  9. #9
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    Quote Originally Posted by cwl@apaqdigital View Post
    it has SATA-III 6G/s 7200rpm 64M buffer. sure, it costs $20-$25 more, but at least it comes with 3-year Seagage warranty
    We hadn't really seen a convincing reason to switch to all Enterprise drives until everyone started playing games with warranties. I hate that they did it, but it worked...

    I can understand covering your ass in saying "not rated for 24/7 use" but we've really seen no noticeable difference in reliability.
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  10. #10
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    Quote Originally Posted by KarlZimmer View Post
    We hadn't really seen a convincing reason to switch to all Enterprise drives until everyone started playing games with warranties. I hate that they did it, but it worked...

    I can understand covering your ass in saying "not rated for 24/7 use" but we've really seen no noticeable difference in reliability.
    from the point of view of "true" failure rate (crash head/motor making noises; no power-on; bad sectors...etc, but "kicked-off" bay HW RAID card doesn't count), count me in with your comment about no real difference in reliability between enterprise drives and desktop drives. actually we saw more failed enterprise sata drives than desktop drives in the same given period.

    however, the "TLER" (time limited error recovery) or similar features does make substantial difference when you deal with hardware array. you know we install hundreds of hardware arrays on yearly basis, and I can't begin to tell you the shear numbers of incidents that a HW RAID card kicked a non-enterprise drive off array due to the TLER, and array got degraded because of it, yet if you tested the supposedly "bad" drive by manufacturer's own diagnostic software outside the array, it would passed all tests, short scan, long scan, write-0 the whole drive...etc with flying colors. fine, "degraded" array means your data is not lost, but after you replace the "bad" desktop drive, which is not "really" bad confirmed by outside tests, the annoying-to- -hell array re-sync would start and every one on the server stars to be slowed to crawl! all for what? well, all because the desktop drive does not have TLER or similar on it so that it triggered this chain of event!

    we had one extreme case associated with one of our long-time clients. against my better advice, they install 6x 2.5" SATA desktop drives to have HW RAID-10 installed on dozens of 12 VPS nodes. guess what happened, out of the 72 drives, more than 70% of them tagged by RAID card as "BAD", yet only 10% of them had true actual hardware faults such as bad sectors, and 90% of them tested all good outside the HW array. all because of what? they don't have TLER or similar built-in so that RAID cards just kicked them off like buzzing flies. imagine all the labor, shipping back-n-forth for RMA, DC remote hand charges, and all the dreadful downtime on busy VPS nodes...some incidents even had 2+ drives got kicked off so that arrays is totally demised and VPS needed to be rescued by R1soft which took a day or two. then, as soon as they used enterprise-grade SATA drives with TLER to replace the desktop drives, all these degraded-array issues got stopped cold and disappeared fast.

    this real-life story goes to tell everyone that saving some bucks upfront by using desktop drives on hardware array is just not worth it, not because they aren't rated for 24x7, not because they aren't or are as reliable as "enterprise" drives, but only because they don't have TLER or similar! you could or would (if you think Mr. Murphy would never ring your bell!) be very regretted later on.

    sorry, Karl and OP, just ranting here! I am fully aware that ttgt want to use software raid where desktop drives could be just dandy with no worry to have such headaches caused by hardware RAID array.
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  11. #11
    Hello,

    We have hundreds of ES.2 and Constellation ES 3,5" disks, at most we've seen 3-4 failures. The Toshiba is a very good disk, and we will be populating the next MSA60 with these. Please remember that the DT01ACA100 is a copy of the Hitachi 7K1000.D, the 7K1000 being a legendary line of SATA HD's.

    Therefore, to answer your question, if I needed to choose between a Desktop
    ST1000DM003 and a Desktop DT01ACA100 (7K1000.D with a Toshiba Label), I would definitely choose the Toshiba.

    I still have at least 40 7K1000's (original 5 platter iteration) and all have survived an aircon destabilization incident in Easynet in 2008 (SMART history on them shows they achieved and survived through 72C) - and they are all still in good order.

    BTW, if you can, take the SAS versions of these instead, it's worth the 10-15% premium as you can later intermix them with other high performance 10/15K SAS disks on the same controller with no performance penalty.
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  12. #12
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    Quote Originally Posted by cwl@apaqdigital View Post
    sorry, Karl and OP, just ranting here! I am fully aware that ttgt want to use software raid where desktop drives could be just dandy with no worry to have such headaches caused by hardware RAID array.
    do you want to tell me there is no worry to use desktop HDD if i want to do centos software raid ? or ? thanx

  13. #13
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    Quote Originally Posted by EuroVPS/Director View Post

    Therefore, to answer your question, if I needed to choose between a Desktop
    ST1000DM003 and a Desktop DT01ACA100 (7K1000.D with a Toshiba Label), I would definitely choose the Toshiba.
    but for performance,will there have much difference ? thanx

  14. #14
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    Quote Originally Posted by ttgt View Post
    do you want to tell me there is no worry to use desktop HDD if i want to do centos software raid ? or ? thanx
    I wouldn't worry too much, was it me! unless you DO want longer warranty like Karl said.

    you know, we installed a few hundreds of Seagate barracuda 7200.14 (the "DM" line) drives from 1TB to 3TB in last 12 months on low-end non-HW-raid boxes, and amazingly, or unexpectedly to say the least, only one SINGLE RMA request from the field. can't say the same thing about WD RE4 nor Seagate Constellation.

    however, it's possible that all things could turn hellish after 1-year in 24x7 production because no 7200.14 has been in service over 12 months so that no one can really say with abolute certainty that it won't happen based on hard numbers from the fields. that would be pretty much the ONLY factor (warranty factor) you want to consider desktop drives v enterprise drives.

    the 7200.14 are really flying! simple 10GB dd write 0 test often exceed 200M/s write, that's really outstanding against the 120M-150M/s from WD black/RE4. don't really know about toshiba drives because we haven't installed them before.
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  15. #15
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    do you suggest me use all the same HDD for one server? or mix different brands of HDD ? because is it possible that all the same brand HDD take fail within the same month after months... thanx

  16. #16
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    Quote Originally Posted by ttgt View Post
    do you suggest me use all the same HDD for one server? or mix different brands of HDD ? because is it possible that all the same brand HDD take fail within the same month after months... thanx
    I won't! if you were so wary about 2 or more HDD failed at the time or one failed shortly the first one, then you would rather use the same model in different batches by buying them from different vendors.
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  17. #17
    Never mix different make/model within an array
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  18. #18
    Quote Originally Posted by ttgt View Post
    but for performance,will there have much difference ? thanx
    I've never seen any consumer grade SATA 6 Gb/s, 7.2k RPM disk that perform better than ST1000DM003. WD Cav Black, Toshiba, Samsung Spinpoint etc not even come close in terms of performance. Not sure about reliability though.
    -

  19. #19
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    Quote Originally Posted by BoxIntense View Post
    I've never seen any consumer grade SATA 6 Gb/s, 7.2k RPM disk that perform better than ST1000DM003. WD Cav Black, Toshiba, Samsung Spinpoint etc not even come close in terms of performance. Not sure about reliability though.
    do you mean the performance of ST1000DM003 is better than WD Cav Black, Toshiba, Samsung Spinpoint etc ? thanx

  20. #20
    Quote Originally Posted by ttgt View Post
    do you mean the performance of ST1000DM003 is better than WD Cav Black, Toshiba, Samsung Spinpoint etc ? thanx
    Yes, it even beat some of the older 10k RPM disk.
    -

  21. #21
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    Use the Hitachi (toshiba) drive for sure. Toshiba re-brands HGST/hitachi drives.

    Seagate drives suck... especially their desktop versions. I have seen thousands of them fail. At a huge web-hosting company I used to work for doesn't even bother RMA'ing them anymore because of the failure rate (especially on the replacements).

    Hitachi on the other hand has had an *excelent* track record.

    We have a bunch Of ZFS machines. Quite a few are Sun xfire 4500's that have 48 hitachi drives. I checked 7-8 of these machines and some have ultrastar disks and some have deskstar ones. Anyway they were 1000-2000 days powered on (so some running over 5 years) and of the 8 machines only one machine had a single drive failure. All the rest were the original drive with near perfect stats.

    When checking a bunch of random seagate machines that are 24 disk machines I see commonly 4-10 drive failures over the life of the machine which is under 1300 days powered on and almost all the drives have re-allocated or pending sectors and general bad disk health. The difference between the health of the drives is chocolate and ****.

  22. #22
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    Hi,houkouonchi,so, do you recommend Toshiba DT01ACA100 than Seagate ST1000DM003 ? thanx

  23. #23
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    Quote Originally Posted by ttgt View Post
    Hi,houkouonchi,so, do you recommend Toshiba DT01ACA100 than Seagate ST1000DM003 ? thanx
    Yes its really a hitachi drive because toshiba bought HGST desktop drives. A lot of people who get them they even report as the hitachi model:

    HDS721010DLE6​30


    Here is an example of hitachi deskstars in a solaris box.. almost 2000 days on. Re-alloc = re-allocated sectors, Pend = pending sectors PC = powercycles and Dayson is how many days its been running (the main things I care about from smart):

    Code:
    Solaris SATA System Detected
    zpool: pool
    device   Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c3t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              26
    c4t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              27
    c8t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              27
    c9t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              29
    c10t1d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              27
    c11t6d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              30
    c3t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              28
    c4t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/1/38/1967              29
    c8t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              30
    c9t2d0   HDS7250SASUN500G/K2AOAJ0A                    2/0/39/1966              31
    c10t2d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              29
    c11t5d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              27
    c3t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              30
    c4t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              31
    c8t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              32
    c9t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              32
    c10t3d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              31
    c11t4d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              24
    c3t4d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              23
    c4t4d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              24
    c8t4d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              25
    c11t1d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              27
    c10t4d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              24
    c11t3d0  HDS7250SASUN500G/K2AOAJ0A                    13/0/39/1967             31
    c3t5d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              27
    c4t5d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              26
    c8t5d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              28
    c9t5d0   HDS7250SASUN500G/K2AOAJ0A                    1/0/39/1966              29
    c10t5d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              27
    c11t2d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              30
    c3t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1967              29
    c4t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              29
    c8t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              30
    c9t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              30
    c10t6d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1967              28
    c10t7d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              30
    c3t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              30
    c4t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              30
    c8t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/38/1966              32
    c9t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/39/1966              31
    
    zpool: rpool
    device   Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c9t0d0s0 HDS7250SASUN500G/K2AOAJ0A                    5/0/39/1966              25
    All the drives are the original system drives (all 1966 or 1967 days powered on) and they are desktop drives (HDS not HUA). And almost all are perfect stats

    Another random hitachi machine:

    Code:
    Solaris SATA System Detected
    zpool: pool
    device   Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c3t0d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              25
    c3t1d0   HDS7250SASUN500G/K2AOAJ0A                    14/0/32/1628             28
    c3t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              30
    c3t3d0   HDS7250SASUN500G/K2AOAJ0A                    2/0/32/1628              32
    c3t5d0   HDS7250SASUN500G/K2AOAJ0A                    18/5/32/1628             27
    c3t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              29
    c3t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c4t0d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              26
    c4t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              29
    c4t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1627              31
    c4t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1627              32
    c4t4d0   HDS7250SASUN500G/K2AOAJ0A                    2/0/32/1628              26
    c4t5d0   HDS7250SASUN500G/K2AOAJ0A                    3/2/32/1628              28
    c4t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              30
    c4t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c8t0d0   HDS7250SASUN500G/K2AOAJ0A                    1/0/32/1628              27
    c8t1d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              30
    c8t2d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              32
    c8t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              32
    c8t4d0   HDS7250SASUN500G/K2AOAJ0A                    2/0/32/1628              26
    c8t5d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              30
    c8t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c8t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              33
    c9t1d0   HDS7250SASUN500G/K2AOAJ0A                    2/0/32/1628              31
    c9t2d0   HDS7250SASUN500G/K2AOAJ0A                    1/0/32/1627              32
    c9t3d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              33
    c9t4d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/31/1591              27
    c9t5d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              30
    c9t6d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              32
    c9t7d0   HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              33
    c10t0d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              27
    c10t1d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              29
    c10t2d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c10t3d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              32
    c10t4d0  HDS7250SASUN500G/K2AOAJ0A                    6/3/32/1628              26
    c10t5d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              29
    c10t6d0  HDS7250SASUN500G/K2AOAJ0A                    3/0/32/1628              30
    c10t7d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c11t0d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              27
    c11t1d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              29
    c11t2d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              31
    c11t3d0  HDS7250SASUN500G/K2AOAJ0A                    2/0/32/1628              32
    c11t4d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              27
    c11t5d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1627              29
    c3t4d0   G.SKILL/02.10104                             0/0/181/0                0
    c11t6d0  HDS7250SASUN500G/K2AOAJ0A                    1/0/32/1628              31
    c11t7d0  HDS7250SASUN500G/K2AOAJ0A                    0/0/32/1628              32
    
    zpool: rpool
    device   Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c9t0d0s0 HDS7250SASUN500G/K2AOAJ0A                    0/0/31/1591              27
    Again all original drives near perfect stats for most.

    Compare this to another machine with the same number of drives but seagate (a few hitachi because now seagates are getting replaced with hitachi):

    Code:
    Solaris SATA System Detected
    zpool: raid2680
    device                  Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c0t5000C5000FE4F503d0   ST31500341AS/CC1H                            3/0/18/541               35
    c0t5000C50014ED84DFd0   ST31500341AS/CC1H                            0/0/20/1208              35
    c0t5000C50014EEE7A0d0   ST31500341AS/CC1H                            14/4/20/1208             34
    c0t5000C5000FE277D5d0   ST31500341AS/CC1H                            164/0/18/562             33
    c0t5000C5001138AB7Dd0   ST31500341AS/CC1H                            12/29/20/1208            33
    c0t5000C500112F67C2d0   ST31500341AS/CC1H                            36/0/20/1208             31
    c0t5000C5001130FC56d0   ST31500341AS/CC1H                            2/0/20/1208              37
    c0t5000C50014A2F9FAd0   ST31500341AS/CC1H                            63/0/18/1208             36
    c0t5000C5001138EA0Ed0   ST31500341AS/CC1H                            11/0/20/1208             37
    c0t5000C50011310ED4d0   ST31500341AS/CC1H                            0/0/20/1208              34
    c0t5000C50011387101d0   ST31500341AS/CC1H                            3/0/20/1208              34
    c0t5000C5001138D1ECd0   ST31500341AS/CC1H                            9/15/20/1208             32
    c0t5000C50011223C05d0   ST31500341AS/CC1H                            2/0/20/1208              36
    c0t5000C5001135CBBAd0   ST31500341AS/CC1H                            4/0/20/1208              36
    c0t5000C500152740EEd0   ST31500341AS/CC1H                            3/0/16/293               36
    c0t5000C50011382748d0   ST31500341AS/CC1H                            5/0/20/1208              35
    c0t5000C50010F6D1AFd0   ST31500341AS/CC1H                            49/0/20/1208             34
    c0t5000C500112F8BB9d0   ST31500341AS/CC1H                            4/0/20/1208              32
    c0t5000C5001108E5A0d0   ST31500341AS/CC1H                            1/1/20/1208              35
    c0t5000C500113932C4d0   ST31500341AS/CC1H                            5/0/20/1208              35
    c0t5000C50011364110d0   ST31500341AS/CC1H                            2/0/20/1208              34
    c0t5000C5001058E143d0   ST31500341AS/CC1H                            11/0/16/293              33
    c0t5000C50014DA8576d0   ST31500341AS/CC1H                            4095/0/20/1208           33     --Reallocated_Sector_Ct is FAILING NOW! Replace ASAP!
    
    zpool: raid8947
    device                  Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c0t5000C500113843B5d0   ST31500341AS/CC1H                            13/0/16/1188             39
    c0t5000C5001138E20Bd0   ST31500341AS/CC1H                            1/0/16/1188              38
    c0t5000C5002A196A0Ed0   ST31500341AS/CC1H                            18/0/14/340              37
    c0t5000C500112F4F53d0   ST31500341AS/CC1H                            9/0/16/1188              37
    c0t5000C5002A2BB776d0   ST31500341AS/CC1H                            1/0/14/280               35
    c0t5000C500112FA267d0   ST31500341AS/CC1H                            6/0/16/1188              33
    c0t5000C50011738869d0   ST31500341AS/CC1H                            2/0/33/460               35
    c0t5000C5001138DCFDd0   ST31500341AS/CC1H                            1/0/16/1188              41
    c0t5000C500111E64B1d0   ST31500341AS/CC1H                            4095/0/16/1188           41     --Reallocated_Sector_Ct is FAILING NOW! Replace ASAP!
    c0t5000C50011384E81d0   ST31500341AS/CC1H                            0/0/16/1188              40
    c0t5000C50011386E0Cd0   ST31500341AS/CC1H                            4084/11/16/1188          37     --Reallocated_Sector_Ct is FAILING NOW! Replace ASAP!
    c0t5000C5001138E81Cd0   ST31500341AS/CC1H                            26/0/16/1188             34
    c0t5000CCA224D748C1d0   HUA723020ALA640/MK7OAA10                     0/0/7/107                40
    c0t5000C50011300BBEd0   ST31500341AS/CC1H                            2/0/17/1188              41
    c0t5000CCA224D74587d0   HUA723020ALA640/MK7OAA10                     0/0/7/107                39
    c0t5000C5001138E54Ad0   ST31500341AS/CC1H                            35/0/16/1188             40
    c0t5000C500105CF0B9d0   ST31500341AS/SD17                            3/0/14/543               38
    c0t5000C500112C01A6d0   ST31500341AS/CC1H                            6/0/16/1188              35
    c0t5000C500113606E5d0   ST31500341AS/CC1H                            0/0/16/1188              39
    c0t5000C500112DC8EDd0   ST31500341AS/CC1H                            3/0/16/1188              38
    c0t5000C500153EEDCEd0   ST31500341AS/CC1H                            15/0/20/910              38
    c0t5000C5001135EA63d0   ST31500341AS/CC1H                            11/0/16/1188             38
    c0t5000C500112143C3d0   ST31500341AS/CC1H                            25/0/16/1188             39
    c0t5000C5001131EEA2d0   ST31500341AS/CC1H                            3/0/16/1188              35
    
    zpool: rpool
    device                  Model Number/Firmware                        Re-aloc/Pend/PC/DaysOn   Temp:
    c3t0d0s0                ST500NM0011/SN02                             0/0/13/273               34
    This machine has two zpools to make up 48 drives. You can see between the 48 drives it has had 10 drives failures from replacements that have a different powered on count. You can also see that 3 of the drives (between the two zpools) have so bad smart stats to the point they are smart failing (might need to scroll right a bit) and almost every single drive has defects of some kind.

  24. #24
    Join Date
    Mar 2009
    Posts
    3,700
    Quote Originally Posted by BoxIntense View Post
    I've never seen any consumer grade SATA 6 Gb/s, 7.2k RPM disk that perform better than ST1000DM003. WD Cav Black, Toshiba, Samsung Spinpoint etc not even come close in terms of performance. Not sure about reliability though.
    with my testing,i use ST1000DM003 * 4 to do centos software raid 10,it is sync now,i find it's best speed is around 200MB/s begin,but normal speed is only about 120MB/s later. is it find ? thanx

  25. #25
    Join Date
    Mar 2008
    Location
    Los Angeles, CA
    Posts
    555
    Quote Originally Posted by ttgt View Post
    with my testing,i use ST1000DM003 * 4 to do centos software raid 10,it is sync now,i find it's best speed is around 200MB/s begin,but normal speed is only about 120MB/s later. is it find ? thanx
    Due to the tracks being longer as you get closer to the outer edge of the platter (where the beginning of the drive starts) you will get faster sequential read/write speeds. Drives write from out-side in so gradually as you get to the end of the drive (and load data on it) speeds will go down up to 50% what they were at the beggining of the drive. This is completely normal for any normal mechanical HD. Obviously SSD's do not suffer from this.

    Here is an example benchmark which shows it visually pretty well:

    http://www.overclockers.com/forums/a...1&d=1240458209

    Sorry if you were asking something different but it was kind of hard to tell from the last half of your message "is it find ? thanx" I guess you meant is it fine/normal?

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