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Re: Verify filesystem is aligned to stripes

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: 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.


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