I have a Lustre 2.15.2 instance "temp01" on ZFS 2.1.5 (on EL8), and I
just want to backup the MDT of the instance (I am mirroring the data on
two separate "pools" of servers).
The "zpool" is called "temp01_mdt_000" and so is the filesystem, so the
'/etc/fstab' mount line is (I have set legacy ZFS mount-points):
temp01_mdt_000/temp01_mdt_000 /srv/temp01/temp01_mdt_000 lustre
defaults,noatime,auto 0 0
As usual '/srv/temp01/temp01_mdt_000' is opaque (no access permissions)
when mounted as 'lustre', but anyhow I would like to backup a snapshot
of it, using 'zfs send'.
If I use 'zpool list' and 'zfs list' I see the relevant details even if
it is mounted as 'lustre'. If I un-mount it and re-mount it as 'zfs' it
looks ordinary, but I would rather not do that.
In theory, however it is mounted, I should be able to (suitably preceded
by 'lctl barrier_freeze') create a snapshot for it, and mount that as
'zfs' to some other mount-point and then 'zfs send' that.
Before doing it on a live Lustre instance (I can't easily afford to
setup a test Lustre instance in the short run) I would like some
confirmation that this is meant to work ideally by someone who does it
routinely :-).
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