On 04/05/10 11:43, Andreas Höschler wrote:
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
zpool add tank log mirror c1t6d0 c1t7d0
You can also do it on the create:
zpool create tank <pool devs> log mirror 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?
Shouldn't need the "-f"
Thanks,
Andreas
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