|Subject:||Re: Using xfs_growfs on SSD raid-10|
|From:||Alexey Zilber <alexeyzilber@xxxxxxxxx>|
|Date:||Thu, 10 Jan 2013 11:50:42 +0800|
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Please see in-line:
On Thu, Jan 10, 2013 at 11:21 AM, Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> wrote:
Only the sw=3 is no longer valid, correct? There's no way to add sw=5?
1. Mount with "noalign", but that only affects data, not journal writes
Is "noalign" the default when no sw/su option is specified at all?
Not a possible solution. The space is for a database and must be contiguous.
3. Add 2 SSDs to the new array and rebuild it as a 6 drive RAID10 to
How is this the obvious and preferred path when I still can't modify the sw value? Same problem. Data loss or reformatting is not the preferred path, it defeats the purpose of using LVM. Also, the potential for data loss by enlarging the raid array is huge.
assuming you actually mean 1MB STRIP above, not 1MB stripe. If you
actually mean 1MB hardware RAID stripe, then the controller would have
I don't believe you're correct here. The SSD Erase Block size for the drives we're using is 1MB. Why does being divisible by 3 matter? Because of the number of drives? Nowhere online have a seen anything about a 768MB+256MB stripe. All the performance info I've seen point to it being the fastest. I'm sure that wouldn't be the case if the controller had to deal with two stripes.
So essentially, my take-away here is that xfs_growfs doesn't work properly when adding more logical raid drives? What kind of a performance hit am I looking at if sw is wrong? How about this. If I know that the maximum number of drives I can add is say 20 in a RAID-10. Can I format with sw=10 (even though sw should be 3) in the eventual expectation of expanding it? What would be the downside of doing that?
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