Like Laura, we do one draid pool and one OST per OSS node. Having
multiple redundancy groups in the draid doesn't give you multiple block
devices; it's still a single pool and device. You could create multiple
pools, but then you are perhaps defeating some of the reasons to use draid.
On 2/6/25 06:40, Laura Hild wrote:
But how can I address them when running mkfs.lustre, if I still want to get 7
OSTs out of it?
When we started using draid, we went from having six ten-disk OSTs per OSS to
one sixty-disk OST per OSS. I'm unsure why one would want seven OSTs on a
single pool, being that if the pool becomes degraded all the OSTs would with
it. It would be as if you made a pool with seven raidz2 vdevs and created
seven datasets. The datasets do not correspond to individual vdevs, but rather
all of the datasets use all of the vdevs.
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