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

To: Stefan Ring <stefanrin@xxxxxxxxx>
Subject: Re: XFS: Abysmal write performance because of excessive seeking (allocation groups to blame?)
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Mon, 9 Apr 2012 14:48:47 +0200
Cc: stan@xxxxxxxxxxxxxxxxx, Linux fs XFS <xfs@xxxxxxxxxxx>
In-reply-to: <CAAxjCEz8TpRvjvbuYPp1xf9X2HwskN5AuPak62R5Jhkg+mmFHA@xxxxxxxxxxxxxx>
Organization: Intellique
References: <CAAxjCEwBMbd0x7WQmFELM8JyFu6Kv_b+KDe3XFqJE6shfSAfyQ@xxxxxxxxxxxxxx> <20350.9643.379841.771496@xxxxxxxxxxxxxxxxxx> <20350.13616.901974.523140@xxxxxxxxxxxxxxxxxx> <CAAxjCEzkemiYin4KYZX62Ei6QLUFbgZESdwS8krBy0dSqOn6aA@xxxxxxxxxxxxxx> <4F7F7C25.8040605@xxxxxxxxxxxxxxxxx> <CAAxjCEyJW1b4dbKctbrgdWjykQt8Hb4Sw1RKdys3oUsehNHCcQ@xxxxxxxxxxxxxx> <4F8055E4.1000808@xxxxxxxxxxxxxxxxx> <CAAxjCEz8TpRvjvbuYPp1xf9X2HwskN5AuPak62R5Jhkg+mmFHA@xxxxxxxxxxxxxx>
Le Mon, 9 Apr 2012 13:02:27 +0200 vous écriviez:

> So 150 MB/sec seems to be the
> best these disks can do,

Definitely NOT right. I mean I've got routinely 600 MB/s from 8 7.2K
drives RAID-6 arrays. Unless cache is off, which RAID-6 isn't obviously
thought for.

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