ZFS Cache & Log Device Failure Handling

[Olivier Smedts]

2010/9/3 Alexander Leidinger <Alexander at leidinger.net>:
> Quoting "Jason J. W. Williams" <jasonjwwilliams at gmail.com> (from Thu, 2 Sep
> 2010 13:30:51 -0600):
>
>> How well does ZFS on FreeBSD handle a dying/wedged log and/or cache
>> device? OpenSolaris handles this pretty well in my experience and will
>> fail through relatively quickly. But this tends to rely on FMA. Thank
>> you in advance.
>
> No problem for the cache device. I have an USB memory stick as a cache
> device, and if I just remove it during operation, the system handles the
> situation. If you connect it again, you need to remove/readd it via zfs
> commands.

I've got the same setup and just have to "online" the usb key after boot.

As for the zil/log device, I think it should be supported in the
upcoming ZFS v28 patch (maybe you can give it a try, see pjd's mail)
because zil removal was introduced in a zpool version after v14/15
(what's in 8-STABLE and 9-CURRENT).

>
> I do not use a log device.
>
> Bye,
> Alexander.
>
> --
> Govern a great nation as you would cook a small fish.  Don't overdo it.
>                -- Lao Tsu
>
> http://www.Leidinger.net    Alexander @ Leidinger.net: PGP ID = B0063FE7
> http://www.FreeBSD.org       netchild @ FreeBSD.org  : PGP ID = 72077137
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-- 
Olivier Smedts                                                 _
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