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I have two SSDs in RAID-0 on a Windows 7, 64-bit system. Since it appears that TRIM still isn't supported with any RAID configuration of SSDs, what are some tips/workarounds that I can use?

Some things, but not limited to, that I would like to optimize are:

  • file write sizes to each disk to best match each 'block' sizes that are erased by the SSD.
  • speed of the RAID reads/writes
  • overall health of the drives
  • Settings of the RAID (i.e. stripe size)
  • any other 'tips' that might be considered for a RAID of SSD's
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No idea, why not post them over to me and I am sure I can work some things out :) –  William Hilsum May 7 '11 at 23:00
    
I'm curious about why you need two SSDs in RAID 0 in the first place. To aggregate the space for convenience? Improved sequential access? I know this really doesn't help answer your question, but my tip would be not to do this. –  sblair May 8 '11 at 0:34
    
@Sblair this was done originally as a test to see if there was a significant increase in speed for a blog post. As there was, the thought was/is that one could purchase two smaller, less-expensive SSD's, then RAID them and get a faster experience cheaper. Yes, you can expect this to be blogged in the future. ;) –  KronoS May 8 '11 at 0:54

1 Answer 1

I would suggest not using RAID0 for good SSDs. A good modern SSD is unlikely to be your bottleneck for most real-world access patterns, at least not in a way RAID-0 is going to help a lot.

Unless of course you are linking a pair of drives together this way in order to have one large volume rather than two separate ones, rather than due to speed concerns...

Some SSD controllers will take writing a block of all 0s to mean that the block is free to be TRIMed (and instead of storing the location of the block in the appropriate index store a sentinel value that means "if you are asked for this block, just return a load of 0s"). If your drives do this then occasionally writing over your free space with 0s would help, using sdelete or similar in zero-only mode. Not terribly efficient of course, and make sure your drives will react this way otherwise you will be making the situation worse rather than better.

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The goal is to be able to have two cheaper, smaller spaced drives that give me more space but not as expensive –  KronoS May 9 '11 at 20:16
    
In that case you'll need to look into if those drives auto-trim for all-zero blocks as described above. Also make sure you have a good backup regime as you are increasing your chance of drive failure noticeably over that of a single drive configuration. –  David Spillett May 9 '11 at 22:54
    
For info, this post describes how to "zero" an entire SSD, under Windows. –  sblair May 15 '11 at 0:52
    
Raid 0 on SSD drives is a bad idea IMO. 2x the chance of data loss. –  Jeff F. May 26 '11 at 17:51

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