ZFS Cache & Log Device Failure Handling

[Jason J. W. Williams]

Hi Olivier,

Removal came around 18, but at least in OpenSolaris failure of the
device (and it's replacement) were handled from day one of the
dedicated ZIL feature.

-J

On Fri, Sep 3, 2010 at 6:18 AM, Olivier Smedts <olivier at gid0.org> wrote:
> 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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