[lustre-discuss] Lustre and ZFS draid

[Nehring, Shane R [ITS]]

Hello All,

I didn't want to hijack the other thread today about draid, but I have been
meaning to ask questions about it and folks' experience with it in the context
of Lustre. Most of my questions come from not having a chance to really play
around with draid much.

Have you been generally satisfied with performance of a single draid vdev vs
either multiple pools/osts per node or single osts on a pool spanning multiple
raidz(2) vdev members? Is random io comparable to a span of raidz2 vdevs? I know
one of the pain points (more from a space usage perspective as I understand it)
is the fixed stripe width and how that impacts small files, but does small file
io perform particularly badly on draid vs a span raidz2?

I've got hardware on order (a couple 60 bay jbods and heads) that's going to
replace some of the older OSTs in our current volume and I'm leaning toward a
single draid pool OST per OSS. I plan to do some benchmarking of the pools in
various configurations, but it's hard to generate a benchmark that's actually
representative of real world usage.

If you've got any insights or anecdotes regarding your experience with draid and
Lustre I'd love to hear them!

Thanks,
Shane
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