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  #1  
Old 03-06-2010, 03:36 AM
ComfortVPS-Macro ComfortVPS-Macro is offline
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SATA disk transfer speed is very slow


Hello,

I'v used hdparm -tT /dev/sda3 to test transfer speed of a SATA disk in a server(Q9300 8GB 1TB STAT2,CENTOS5.4 32bit), but I got a very slow result for 9.36 MB/sec below:

hdparm -tT /dev/sda3:
Timing cached reads: 8052 MB in 2.00 seconds = 4027.18 MB/sec
Timing buffered disk reads: 30 MB in 3.21 seconds = 9.36 MB/sec


In another server, I got a result for 86.41 MB/sec (Q9300 4GB 1TB STAT2,CENTOS5.3 32bit):

hdparm -tT /dev/sda3

/dev/sda3:
Timing cached reads: 7680 MB in 2.00 seconds = 3843.47 MB/sec
Timing buffered disk reads: 260 MB in 3.01 seconds = 86.41 MB/sec


Is there anyone know why this happened and how to increase the speed of disk of the first server?

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  #2  
Old 03-06-2010, 05:43 AM
24x7group 24x7group is offline
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Maybe the disk is bad or one of the power or sata cables.
Let your hosting provider have a look at it for you.

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  #3  
Old 03-06-2010, 06:37 AM
gyver gyver is offline
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To get accurate results, the machine must be idle. Was there disk activity going on while you tested your disk ? Use vmstat/dstat to look at disk transfers.

If there is disk activity, stop all processes that might be responsible until there is at most only occasional bursts of 10s of KB written to disk and restart your test.

If there isn't disk activity and you still get this kind of transfer speed, tell your hosting provider about it.

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  #4  
Old 03-06-2010, 06:41 AM
thezombiehunter thezombiehunter is offline
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OP:

Either a bad drive, cable or controller... or driver, I guess.

This is why I like RAID-10 (4 disk array):

hdparm -tT /dev/md0

/dev/md0:
Timing cached reads: 11672 MB in 2.00 seconds = 5839.79 MB/sec
Timing buffered disk reads: 722 MB in 3.03 seconds = 238.63 MB/sec

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  #5  
Old 03-06-2010, 06:46 AM
net net is offline
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Moved > Hosting Security and Technology.

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  #6  
Old 03-06-2010, 06:51 AM
madaboutlinux madaboutlinux is offline
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As said by "gyver", the disk should be in idle state when you perform the tests to get the accurate results. If the disk was in idle state and result is the same as you stated, then better as your hosting provider OR the Data Center Enggs to take a look at it.

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  #7  
Old 03-06-2010, 08:16 AM
PCS-Chris PCS-Chris is offline
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The disk probably isnt running in native mode in the bios, OR it's a bad SATA cable. Have your DC swap it out

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  #8  
Old 03-06-2010, 11:18 PM
ComfortVPS-Macro ComfortVPS-Macro is offline
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Thanks everyone, the hosting provider bring the server down and testing the hard driver right now.

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  #9  
Old 03-07-2010, 04:16 AM
ComfortVPS-Macro ComfortVPS-Macro is offline
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Quote:
Originally Posted by macroz View Post
Thanks everyone, the hosting provider bring the server down and testing the hard driver right now.
Replaced the motherboard and works:

hdparm -t /dev/sda3

/dev/sda3:
Timing buffered disk reads: 120 MB in 3.13 seconds = 38.35 MB/sec


# hdparm -t /dev/sda2

/dev/sda2:
Timing buffered disk reads: 236 MB in 3.06 seconds = 77.03 MB/sec

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  #10  
Old 03-07-2010, 10:19 AM
Peter-SexyWing Peter-SexyWing is offline
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wow, is this normal for us?

hdparm -tT /dev/sda8

/dev/sda8:
Timing cached reads: 17568 MB in 2.00 seconds = 8803.90 MB/sec
Timing buffered disk reads: 246 MB in 3.07 seconds = 80.24 MB/sec


We have 15K SAS drives X4 with 256mb hardware RAID 10


80.24 MB/sec seems very slow???


How to detect whether there is a bad drive on RAID 10 disk array?

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  #11  
Old 03-07-2010, 03:43 PM
xtrac568 xtrac568 is offline
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Quote:
Originally Posted by Peter-SexyWing View Post
wow, is this normal for us?

hdparm -tT /dev/sda8

/dev/sda8:
Timing cached reads: 17568 MB in 2.00 seconds = 8803.90 MB/sec
Timing buffered disk reads: 246 MB in 3.07 seconds = 80.24 MB/sec


We have 15K SAS drives X4 with 256mb hardware RAID 10


80.24 MB/sec seems very slow???


How to detect whether there is a bad drive on RAID 10 disk array?
not sure how much your disks were loaded during tests, but it looks slow.
e.g. you can get ~100MB/s on newer SATA disks without any RAID setup, while they are idling.

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