Hello Peter,
Enquiring minds want to know: if this code does on the fly parity
checking on reads, what protocol is being used between the OSS node
and the thumper and whether the data rates quoted are to a single
thumper or a group of thumpers behind the OSS node.
I second the request by Evan for patch pointers.
thanks,
Jim
On Mon, 11 Dec 2006, Peter J Braam wrote:
The versions of the Linux kernel for which there are Lustre patches do not
have stable RAID6. Some of our customers experienced data corruption in the
RAID6 layer.
We have a highly optimized RAID5 layer for use with Lustre (several times
faster than normal RAID5) - with that layer the SUN thumper boxes can get
over 1GB/sec. Alex can point you at the kernel patches for that, if you'd
like to try it.
- Peter -
On Dec 11, 2006, at 9:07 AM, Julien Perez wrote:
Hello Andreas, everyone,
Im planning to use software RAID6 (mdadm) on an OST with Lustre. Do you
think it is safe to do so ? Any advise against it ?
Julien
On 12/6/06, Andreas Dilger <[EMAIL PROTECTED]> wrote:
On Dec 05, 2006 16:58 -0800, Lin Shen (lshen) wrote:
> The FAQ says that Lustre supports software RAID. Is the software RAID
> cluster aware? Can I put two partitions from two different nodes into
> the same RAID set?
No. The cluster-aware RAID feature (Lustre RAID = LAID) is only in the
planning stages.
This is only indicating that Lustre can use MD RAID{0,1,5} devices
for a back-end OST or MDT filesystem. That said, there was a bug just
found with Lustre OSTs and software RAID 5 (bug 11313) if you are
planning on using software RAID 5 you need a patch.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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