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Re: XFS: Abysmal write performance because of excessive seeking (allo

To: Linux fs XFS <xfs@xxxxxxxxxxx>
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
From: pg_xf2@xxxxxxxxxxxxxxxxxx (Peter Grandi)
Date: Fri, 6 Apr 2012 02:09:47 +0100
In-reply-to: <20120405213740.GA22824@xxxxxxxxxxxxx>
References: <CAAxjCEwBMbd0x7WQmFELM8JyFu6Kv_b+KDe3XFqJE6shfSAfyQ@xxxxxxxxxxxxxx> <20120405213740.GA22824@xxxxxxxxxxxxx>
[ ... ]

> For metadata intensive workloads like yours you would be much
> better using a non-striping raid, e.g. concatentation and
> mirroring instead of raid 5 or raid 6. I know this has a cost
> in terms of "wasted" space, but for IOPs bound workload the
> difference is dramatic.

The problem with parity RAIDs and small-write-IO intensive
workloads is not striping as such, it is with *large* stripes.
That is a detail that matters quite a lot.

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