Re: Busted disks caused healthy ones to fail

[Michael Stumpf <mjstumpf@pobox.com>]

14 Internal drives on a single power supply plus the mb/cpu/etc?  Oy; 
I've got 15 + a p2-400 spinning between 2 550w power supplies, and I'm 
worried it is getting overloaded.  I might be paranoid, but I had some 
flakiness that was pretty much impossible to debug, so I took broad 
steps and overestimated.  Figured that maybe a heavily loaded supply 
could hiccup under an unusual condition if too many were attached to 
one..  and, while anecdotal, my once-a-month drive hiccup (require 
re-add to array, nothing else) problem did go away when I added a power 
supply.

comsatcat wrote:

>The two disks that were actually dead were both on a different bus.  The
>OS disk that died was on scsi0.
>
>Is there a way around this behavior (ie: kernel params that can be
>adjusted such as timeout values and queuing)?  It never really recovered
>correctly after the disks died, a manual reboot as required.
>Applications which were using the failed devices would hang forever (I'm
>assuming they were waiting for queued commands to complete).
>
>IDE: not in use
>Power: 14 internal drives, no external
>Temp: fust fine
>Kids: Upstairs taking tech calls.
>
>
>Thanks,
>Ben
>
>
>On Tue, 2004-12-14 at 01:55 -0500, Guy wrote:
>  
>
>>Did the disks that failed have anything in common?
>>
>>SCSI:
>>If you have disks on 1 SCSI bus, a single failed disk can affect other
>>disks.  By removing the bad disk you correct the problems with the others.
>>
>>IDE:  (or what ever they call it today)
>>2 disks on 1 bus, 1 drive failure will cause the other to fail most of the
>>time.
>>
>>Power supply:
>>If you have external disks, they will have another power supply.  If you
>>have problems with this power supply, they all could be affected.  Even a
>>common power cable can cause multi drive failures.
>>
>>Temperature:
>>Disks getting too hot can cause failures.
>>
>>Kids:
>>Someone turned the disk cabinet off?
>>
>>I am sure this list is not complete.  But it may help.
>>
>>Guy
>>
>>-----Original Message-----
>>From: linux-raid-owner@vger.kernel.org
>>[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of comsatcat
>>Sent: Tuesday, December 14, 2004 1:42 AM
>>To: linux-raid@vger.kernel.org
>>Subject: Busted disks caused healthy ones to fail
>>
>>An odd thing happened this weekend.  We were doing some heavy I/O when
>>one of our servers had two drives in two seperate raid1 mirrors pop.
>>This was not odd as these drives are old and the batch they are from
>>have been failing on other boxen as well.  What is odd is that our brand
>>new disks which the OS resides on (2 drives in raid 1) half busted.
>>
>>There are 4 md devices
>>
>>md/0  
>>md/1
>>md/2
>>md/3
>>
>>md3, md2, and md1 all lost the 2nd drive in the array (sdh3, sdh6, and
>>sdh5).  md0 however was fine with sdh1 being fine.  Why would losing
>>disks cause a seemingly healthy disk to go astray?
>>
>>P.S. I have pull out tons of syslogs showing the two bad disks failing
>>if that would help.
>>
>>
>>Thanks,
>>Ben
>>
>>-
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>>
>
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>  
>


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