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

Bill Davidsen
2006-10-06T03:17:23Z

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
>