[Beowulf] Surviving a double disk failure

Michael Will mwill at penguincomputing.com
Fri Apr 10 10:27:43 PDT 2009

raid6 is also new code with new bugs that can lead to dataloss as well, regardless of its nice 'can survive
two drive failures' feature. I have seen it happen.


-----Original Message-----
From: beowulf-bounces at beowulf.org on behalf of Orion Poplawski
Sent: Fri 4/10/2009 10:23 AM
To: landman at scalableinformatics.com
Cc: Beowulf List
Subject: Re: [Beowulf] Surviving a double disk failure
Joe Landman wrote:
> Stuart Midgley wrote:
> Good work Stuart!
>> What are the lessons learnt? Well with software raid Linux is both your 
> 1) Use RAID6.  It is your friend.  RAID5 is unashamedly your enemy.

So, what's a reasonably limit on the number of disks in a RAID6 array 
using 1.5TB disks?

Orion Poplawski
Technical Manager                     303-415-9701 x222
NWRA/CoRA Division                    FAX: 303-415-9702
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