Re: dell poweredge 2400 harddisks going into offline mode when heavy I/O occurs

[Bill Davidsen <davidsen@tmr.com>]

Matt Domsch wrote:
> On Thu, Sep 28, 2006 at 04:19:23PM +0200, Folkert van Heusden wrote:
> > Hi,
> >
> > I have a Dell Poweredge 2400 with 6 scsi harddisks in (hw-) raid 5.
> > 512MB ram, 2x P3.
> > When heavy disk i/o occurs, the system puts the harddisks into offline
> > mode causing the filesystems to be put in readonly. The current kernel
> > is 2.6.8, with 2.4.27 this did not occure. Googling did not help. The
> > disks all have green lights (there's a special led for each to indicate
> > errors - that one is off).
>
> [snip]
> > Sep 28 16:05:12 kasparov kernel: aacraid: Host adapter reset request. SCSI hang ?
> > Sep 28 16:06:12 kasparov kernel: aacraid: SCSI bus appears hung
> > Sep 28 16:06:12 kasparov kernel: scsi: Device offlined - not ready after error recovery: host 1 channel 0 id 0 lun 0
>
> Yes, this is familiar. See:
>
> http://lists.us.dell.com/pipermail/linux-poweredge/2004-May/014694.html
>
> In addition, please consider mounting your file systems with
> 'noatime', as this reduces the number of small writes being sent to
> the disks.
>
> 2.6.x kernels have the ability to swamp the RAID controller firmware
> with requests where 2.4.x kernels couldn't so easily.

Can you configure the controller as JBOD and use software raid. Would 
the controller keep up with that?
> Thanks,
> Matt


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