|To:||stan@xxxxxxxxxxxxxxxxx, xfs-oss <xfs@xxxxxxxxxxx>|
|Subject:||Re: RAID setups, usage, Q's' effect of spindle groups...etc...blah blahblah...|
|From:||Linda Walsh <xfs@xxxxxxxxx>|
|Date:||Mon, 21 Jan 2013 09:12:21 -0800|
|References:||<50FAF860.3000702@xxxxxxxxx> <20130119231644.GX2498@dastard> <50FB3265.8060506@xxxxxxxxx> <20130120004638.GZ2498@dastard> <50FBB9D4.9060109@xxxxxxxxxxxxxxxxx> <50FCB3B8.5000404@xxxxxxxxx> <50FD44C1.7040301@xxxxxxxxxxxxxxxxx>|
|User-agent:||Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:22.214.171.124) Gecko/20100228 Lightning/0.9 Thunderbird/126.96.36.199 Mnenhy/0.7.6.666|
If nothing else I hopefully got the point across as to how destructive parity RAID read-modify-write operations are to performance. It's simply impossible to get good mixed IO performance from parity RAID unless one's workloads always fit in controller write cache, or if one has SSD storage.
---- Will have to reread it a few times to digest everything (but it is sufficiently depressing...)... Especially the costs on the enclosures...I am pretty sure I paid under 1k for each of them....*ouch*...
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