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  #1  
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LSI Megaraid 9266-8i and TRIM and RAID


Hi,

As topic suggests we're running a few of these on our SANs but seems like no TRIM support.

Does LSI offer an option that supports TRIM? These are all SSD arrays using CacheCade as well.

Also, what RAID are people running? We're doing RAID 10 but have been considering going RAID 0 and having 2 SANs mirror each other for better throughput and real redundancy



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  #2  
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Join Date: Aug 2006
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Quote:
Originally Posted by The Broadband Man View Post
Hi,

As topic suggests we're running a few of these on our SANs but seems like no TRIM support.

Does LSI offer an option that supports TRIM? These are all SSD arrays using CacheCade as well.

Also, what RAID are people running? We're doing RAID 10 but have been considering going RAID 0 and having 2 SANs mirror each other for better throughput and real redundancy
No TRIM. Here's an interesting perspective:

http://www.xtremesystems.org/forums/...=1#post5027110

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  #3  
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Also we're using these with Samsung 830s. Do these have some sort of optimized GC built into the controllers?

LSI is coming out with these - interesting pricing ... given that a 100GB PCI SSD probably makes up most of the cost of that card ...

http://www.techpowerup.com/171656/LS...ion-Cards.html

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  #4  
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Quote:
Originally Posted by The Broadband Man View Post
Also we're using these with Samsung 830s. Do these have some sort of optimized GC built into the controllers?

LSI is coming out with these - interesting pricing ... given that a 100GB PCI SSD probably makes up most of the cost of that card ...

http://www.techpowerup.com/171656/LS...ion-Cards.html
actually, you will want to wait for Samsung 840 Pro for about 2 more weeks.

840 pro gives you more than twice the IOPS on random write, yet it costs just 20% more than 830.

if you had Xeon E3 v2 or dual E5, would want to do 9271-8i PCIe 3.0 based LSI instead of 9266-8i PCIe 2.0.

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  #5  
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What is the price difference between the 9266 and the 9271 and what are the benefits?

Will look into the 840s - are there any specific benefits in terms of garbage collection - rather than just performance/

  #6  
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Newegg sells Samsung 830 128GB for $108 shipping. Samsung 840s will be $150 for 128GB so its more like 50% more.

That said, I'm more interested in things other than raw speed. More about durability and the controllers

  #7  
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Quote:
Originally Posted by The Broadband Man View Post
What is the price difference between the 9266 and the 9271 and what are the benefits?

Will look into the 840s - are there any specific benefits in terms of garbage collection - rather than just performance/
regardless 830 or 840 or any SSD for that matter, you just won't get TRIM support unless you want to give up hardware RAID. it's not a matter of choice! none of the hardware RAID cards on the market today can support TRIM which is also OS dependent. for linux, you will need to install experimental 2.6.33 kernel (even the latest RHEL6.3 production kernel is 2.6.32.xxx) just to get TRIM support if you connect SSD's to on-board Intel SATA controller (C202, C204, C602, C604) without going thru hardware RAID card.

the whole purpose of TRIM is to minimize write amplification, improve performance and endurance, so can the technique of over-provisioning (OP) which is entirely possible and darn easy to do with hardware RAID card. all you have to do is to leave some percentage out of full capacity as blank/unused raw space at the time you configure the array size. i.e. set array size to 410GB to a 4x 256GB SSD RAID-10 will give you about 20% over-provisioning and this 20% can improve endurance level as well as random write IOPS by 2-3 folds!
http://cache-www.intel.com/cd/00/00/...354_492354.pdf
although white paper above is about Intel 320 SSD drives, but it can apply all SSD drives in general.

"$150" is the MSRP for 128GB Samsung 840 Pro. historically speaking, newegg has the tenancy to sell spanking-new-to-market products in MSRP. the settle-down street price shall be much lower than what newegg would sell or pre-book you for now.

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  #8  
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Originally Posted by The Broadband Man View Post
What is the price difference between the 9266 and the 9271 and what are the benefits?...
PCIe 3.0 can do 8 GT (gigatransfer) per second which effectively delivers 60% higher bandwidth than PCIe 2.0 (5 GT/s). it may matter a lot when you have SSD-only arrays.

9271-8i is essentially the same price with 9265/9266-8i. well, perhaps $10-$15 more unless someone is dumping the old inventory of 9265/9266 cards...

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  #9  
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When did the 9271 come out? Our server vendor was asking us to buy the 9266 even a month ago ...

  #10  
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Originally Posted by The Broadband Man View Post
Also, what RAID are people running? We're doing RAID 10 but have been considering going RAID 0 and having 2 SANs mirror each other for better throughput and real redundancy
If your running >4 drives I don't see any reason to not run raid6? More space efficient and unless you really need 100% of the iops of the SSD's the write whole (halving the iops) should not be a huge deal on SSD's. Actually even with only 4 drives I would seriously consider raid6 with SSD's.

  #11  
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Originally Posted by The Broadband Man View Post
When did the 9271 come out? Our server vendor was asking us to buy the 9266 even a month ago ...
haven't checked other outfits, but at least Provantage has 9271-8i in stock for $645:
http://www.provantage.com/lsi-logic-...0~7LSIG0P4.htm
and they still sell 9266-8i for $634.

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  #12  
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wow nice and cheap..

Shame provantage won't do business with me, they declined my American Express card and won't allow bank transfer from Australia.

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  #13  
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Quote:
Originally Posted by The Broadband Man View Post
Does LSI offer an option that supports TRIM? These are all SSD arrays using CacheCade as well...
if you run all SSD arrays, you don't really need CacheCade which is designed to boost performance from much slower spin drives by using single (or a pool of) ultra fast SSD as caching devices on BIOS level. what you need for pure SSD array is FastPath:
http://www.lsi.com/products/storages...hSoftware.aspx
LSI claims that FastPath can boost LSI 2208 ROC based RAID card running all SSD arrays to 465000 IOPS!

anyway, the 9271-8iCC includes both CacheCade and FastPath in one packaging so that you don't have to buy the keys for CacheCade/FastPath separately.

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  #14  
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Originally Posted by eva2000 View Post
Shame provantage won't do business with me, they declined my American Express card and won't allow bank transfer from Australia.
We use an American Express card with Provantage. Do they just not take orders with a foreign billing address?

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  #15  
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It's strange, my order went through at provantage.com web site after i read for Australians they take either American Express or bank wire transfer payments. Then get 2 emails, first one says they can't accept my American Express payment and give me bank wire transfer info. Then 2nd email arrives a few minutes later and says they can't accept bank wire transfer and for me to send a money order as the only acceptable payment method

Guess my ip or something set off fraud alerts or something.

Coincidentally, the order was for LSI 9260-8i BBU and fastpath key. So ended up cancelling order and buying elsewhere.

My 9260-8i BBU seems to have died now, probably not worth investing in another when new LSI cards have cache vault.

I have a dual E5-2650 here with PCI-E 3.0 so that 9271-8i looks like just what I need to match up with my 256GB Samsung 830 and Plextor M5S SSDs (seem to perform better than Samsung 830 on C602 chipset)

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