topic Re: Intel RAID0, TRIM and X25-M SSD Again :) in Archive

Intel RAID0, TRIM and X25-M SSD Again :)

idata — Thu, 30 Sep 2010 01:46:37 GMT

Can find answer for a long time....[

2x 80Gb X25-M [Raid0] VS 1x 160Gb X25-M

on Intel S5520SC motherboard ICH10R ESRT-2 Raid Controller(software)?

What will be faster(Write/ 4k operations/ Access time)? What are the disadvantages of raid0? Will TRIM work on Raid0 for me?

Re: Intel RAID0, TRIM and X25-M SSD Again :)

MBall5 — Fri, 01 Oct 2010 16:22:11 GMT

Hello, I would like to let you know that because a hardware limitation trim command will not be available if you use a Solid State Drive under any RAID option, the impact without this trim option is that you will lose performance eventually and might need to reinstall the operating system.

Regarding the speed or markings information I suggest you to check the following Intel® webpage:

http://www.intel.com/performance/mobile/sata/sata.htm http://www.intel.com/performance/mobile/sata/sata.htm

Re: Intel RAID0, TRIM and X25-M SSD Again :)

idata — Sat, 02 Oct 2010 02:03:29 GMT

So article http://www.bit-tech.net/news/hardware/2010/03/23/intel-releases-trim-for-raid/1 is wrong?

Re: Intel RAID0, TRIM and X25-M SSD Again :)

idata — Sat, 02 Oct 2010 09:54:59 GMT

Yes. They got confused. If you have an SSD that is a non-member of a raid array it will trim. If the SSD is part of the raid array it will not trim.

From announcement # 3 at the head of the forum.

"Intel® RST 9.6 supports TRIM in AHCI and pass through modes for RAID. A bug has been submitted to change the string that indicates TRIM is supported on RAID volumes (0, 1, 5, 10). Intel is continuing to investigate the ability of providing TRIM support for all RAID volumes in a future release."

Re: Intel RAID0, TRIM and X25-M SSD Again :)

idata — Sat, 02 Oct 2010 11:25:29 GMT

So the only way to defragment/optimize raid0 is - Windows/other defragmentation tools? Are they effective for SSDs?

Re: Intel RAID0, TRIM and X25-M SSD Again :)

idata — Sat, 02 Oct 2010 13:23:16 GMT

The issue is not really fragmentation (as occurs with hdd) it is degradation. Degradation is explained here:

http://www.anandtech.com/show/2738/8

The only option to prevent degradation (in a raid config) is to run a secure erase on each drive in the array using either hdderase or the new Intel toolbox. This will wipe all data and set the drives back to factory condition. If you save an image of the drive before you wipe it and then reinstall it after you have secure erased the drive you will be back to optimised performance in no time.

If you are not always writing heavily you won't need to do it very often.