[Pvfs2-users] Can PVFS over multiple disks on a single node
tolerate disk failures?
slang at mcs.anl.gov
Fri Jan 18 16:59:21 EST 2008
On Jan 18, 2008, at 2:29 PM, Scully wrote:
> I want to store PVFS data on four disks in the same node. If I don't
> choose RAID, based on my understanding to <3.2 How can I store PVFS
> data on multiple disks on a single node?> in the FAQ, I should set
> four servers, each for a disk.
> Can such a system tolerate disk failures?
It would be similar to RAID0 over those disks. There's no mirroring
or data redundancy, so a disk failure would cause a loss of data.
> Should I set each disk a metadate server to get the disk failure
In your case adding metadata servers won't help, since all the servers
are running on the same node. Just pick one of the disks (servers) to
manage the metadata.
> I think the <7.3 Can PVFS tolerate disk failures?> in the FAQ means,
> if I use RAID5 or RAID6 to combine the disks first, then, it can
> tolerate, am I right?
Yes. redundant RAID schemes provide for recovery if a disk should
fail. Running PVFS servers on-top of RAID5 usually slows down writes
a little, but if you want to tolerate failures, the performance hit is
probably worth it.
> Thank you.
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> Pvfs2-users at beowulf-underground.org
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