From: John Robinson <john.robinson@anonymous.org.uk>
To: linux-raid@vger.kernel.org
Subject: Re: slow mdadm reshape, normal?
Date: Thu, 11 Jun 2009 21:50:35 +0100 [thread overview]
Message-ID: <4A316E1B.9060607@anonymous.org.uk> (raw)
In-Reply-To: <20090611194552.GQ30825@rlogin.dk>
On 11/06/2009 20:45, Michael Ole Olsen wrote:
[...]
> it seems there is 21ms wait time for each request due to this pci slowness. (await is in miliseconds)
>
> might be the controller that isnt so fast to do simultaneous read and writes,
> perhaps because its NCQ support might be bad?
>
> so I don't really have more ideas, except to buy a new controller card from a better brand (Adaptec) :(
I have no personal experience of SIL SATA cards, but they've been
mentioned before as being behind slowness. It's also possible something
else on your PCI bus is choking things, so before you go and blow lots
of real money on a better brand, what else is on your PCI bus? Please
tell me the output of `lspci -tv` and the contents of /proc/interrupts
twice (before and after a short delay, e.g. `cat /proc/interrupts ;
sleep 5 ; cat /proc/interrupts`).
Cheers,
John.
next prev parent reply other threads:[~2009-06-11 20:50 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-27 15:28 FW: Detecting errors on the RAID disks Simon Jackson
2009-05-27 19:35 ` Richard Scobie
2009-05-28 8:19 ` Simon Jackson
[not found] ` <20090610224055.GW30825@xxxxxxxxx>
2009-06-10 23:36 ` Re: slow mdadm reshape, normal? Michael Ole Olsen
2009-06-11 8:19 ` Robin Hill
2009-06-11 16:07 ` Michael Ole Olsen
2009-06-11 19:45 ` Michael Ole Olsen
2009-06-11 20:50 ` John Robinson [this message]
2009-06-11 21:11 ` slow mdadm reshape, normal? lspci/iostat info Michael Ole Olsen
2009-06-12 0:53 ` slow mdadm reshape, normal? Roger Heflin
-- strict thread matches above, loose matches on Subject: below --
2009-06-10 22:40 Michael Ole Olsen
2009-06-10 23:04 ` John Robinson
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