| To: | xfs@xxxxxxxxxxx |
|---|---|
| Subject: | Re: Verify filesystem is aligned to stripes |
| From: | Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> |
| Date: | Thu, 25 Nov 2010 01:00:37 -0600 |
| In-reply-to: | <20101125054607.GM13830@dastard> |
| References: | <4CED5BFC.8000906@xxxxxxxxxxxxx> <20101125054607.GM13830@dastard> |
| User-agent: | Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6 |
Dave Chinner put forth on 11/24/2010 11:46 PM: > Because writes for workloads like this are never full stripe writes. > Hence reads must be done to pullin the rest of the stripe before the > new parity can be calculated. This RMW cycle for small IOs has > always been the pain point for stripe based parity protection. If > you are doing lots of small IOs, RAID1 is your friend. Do you really mean RAID1 here Dave, or RAID10? If RAID1, please elaborate a bit. RAID1 traditionally has equal read performance to a single device, and half the write performance of a single device. -- Stan |
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