Mailinglist Archive: opensuse-amd64 (321 mails)
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Re: [suse-amd64] megaraid and write-performance
- From: Andi Kleen <ak@xxxxxxx>
- Date: Fri, 16 Jul 2004 11:54:48 +0000 (UTC)
- Message-id: <20040716115447.GA9555@xxxxxxxxxxxxx>
On Fri, Jul 16, 2004 at 12:24:02PM +0200, Frank Schmitz wrote:
> i have performance difficulties with a dual-opteron system : there is a
> scsi - megaraid controller with 4 harddrives configured as a raid 10. our
> database writes huge temp-files (up to 4GB). the feeling was - it`s slow.
> So i compared it with a similar 32-bit system: the 64-bit needed twice (!)
> the time to copy a 4GB -asciifile than the 32-bit system.
> i changed the raid-parameters (writeback to write through and some more) -
> no effect
> i changed the modules megaraid to megaraid2 - no effect
>
> what can i do to get it faster??
Does the 32bit system use an megaraid too?
megaraids are always quite slow compared to other RAID controllers.
I also don't know of a way to make them faster. Software RAID with a simple
SCSI controller is usually much faster.
-Andi
> i have performance difficulties with a dual-opteron system : there is a
> scsi - megaraid controller with 4 harddrives configured as a raid 10. our
> database writes huge temp-files (up to 4GB). the feeling was - it`s slow.
> So i compared it with a similar 32-bit system: the 64-bit needed twice (!)
> the time to copy a 4GB -asciifile than the 32-bit system.
> i changed the raid-parameters (writeback to write through and some more) -
> no effect
> i changed the modules megaraid to megaraid2 - no effect
>
> what can i do to get it faster??
Does the 32bit system use an megaraid too?
megaraids are always quite slow compared to other RAID controllers.
I also don't know of a way to make them faster. Software RAID with a simple
SCSI controller is usually much faster.
-Andi
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