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Bug#600031: updating kernel causes slow write speed to raid

On Tue, 2010-10-12 at 23:07 +0100, Dave Clarke wrote:
> Package: linux-image
> Version: 2.6.32-5-686
> After dist-upgrade from Lenny to Squeeze write speed is halved. Shown
> with bonnie++. Before upgrade write speed was 21MB/s, after upgrade
> 10MB/s.

Let's see the output from bonnie++.  Also are you running this locally
or over NFS or other network filesystem?

> Hardware: Dell Powervault 745n with hardware raid Adaptec 2610SA.
> Celeron(R) CPU 2.40GHz, 512MiB RAM.
> Confirmed link to kernel with:
> otherserver$ scp 4gbfile raid_server:
>    100% 4000MB   6.6MB/s   10:06
> reboot server with kernel 2.6.26-2-686 leftover from Lenny.
> otherserver$ scp 4gbfile raid_server:
>    100% 4000MB  11.3MB/s   05:55
> Also of note that when copying a large file the system becomes heavily loaded.
>    iowait: 80.1%wa
>    load average: 3.58, 1.48, 0.66
>    Mem:    514428k total,   508276k used,     6152k free,    10084k buffers

That seems like too little memory for a file server.  Can you send the
contents of /proc/meminfo?

Also what filesystem is used on the RAID?


Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.

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