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

To: stan@xxxxxxxxxxxxxxxxx
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Sat, 7 Apr 2012 10:49:12 +0200
Cc: Stefan Ring <stefanrin@xxxxxxxxx>, Linux fs XFS <xfs@xxxxxxxxxxx>
In-reply-to: <4F7F7C25.8040605@xxxxxxxxxxxxxxxxx>
Organization: Intellique
References: <CAAxjCEwBMbd0x7WQmFELM8JyFu6Kv_b+KDe3XFqJE6shfSAfyQ@xxxxxxxxxxxxxx> <20350.9643.379841.771496@xxxxxxxxxxxxxxxxxx> <20350.13616.901974.523140@xxxxxxxxxxxxxxxxxx> <CAAxjCEzkemiYin4KYZX62Ei6QLUFbgZESdwS8krBy0dSqOn6aA@xxxxxxxxxxxxxx> <4F7F7C25.8040605@xxxxxxxxxxxxxxxxx>
Le Fri, 06 Apr 2012 18:28:37 -0500 vous écriviez:

> Creating four 60 drive RAID10 arrays, let alone 60 drive RAID6
> arrays, would be silly.

From my experience, with modern arrays don't make much of a difference.
I've reached decent IOPS (i. e. about 4000 IOPS) on large arrays of up
to 46 drives provided there are enough threads -- more threads than
spindles, preferably.

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