All,
We have been having some discussion about the best practices when
creating OSTs with ZFS.
The basic question is: What is the best ration of OSTs per OSS when
using ZFS?
It is easy enough to do a single OST with all disks and have reliable
data protection provided by ZFS. It may be an better scenario when
snapshots of lfs become a feature as well.
However, multiple OSTs can mean more stripes and faster reads/writes. I
have seen some tests that were done quite some time ago which may not be
so valid anymore with the updates to Lustre.
We have a system for testing that has 5 NVMes each. We can do 1 zfs file
system with all or we can separate them into 5 (which would forgo some
of the features of zfs).
Any prior experience/knowledge/suggestions would be appreciated.
Brian Andrus
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