Hi Khyron,
No, he did *not* say that a mirrored SLOG has no benefit,
redundancy-wise.
He said that YOU do *not* have a mirrored SLOG. You have 2 SLOG
devices
which are striped. And if this machine is running Solaris 10, then
you cannot
remove a log device because those updates have not made their way into
Solaris 10 yet. You need pool version >= 19 to remove log devices,
and S10
does not currently have patches to ZFS to get to a pool version >= 19.
If your SLOG above were mirrored, you'd have "mirror" under "logs".
And you
probably would have "log" not "logs" - notice the "s" at the end
meaning plural,
meaning multiple independent log devices, not a mirrored pair of logs
which
would effectively look like 1 device.
Thanks for the clarification! This is very annoying. My intend was to
create a log mirror. I used
zpool add tank log c1t6d0 c1t7d0
and this was obviously false. Would
zpool add tank mirror log c1t6d0 c1t7d0
have done what I intended to do? If so it seems I have to tear down the
tank pool and recreate it from scratc!?. Can I simply use
zpool destroy -f tank
to do so?
Thanks,
Andreas
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