ZFS Cache & Log Device Failure Handling
Jason J. W. Williams
jasonjwwilliams at gmail.com
Fri Sep 3 18:10:41 UTC 2010
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.
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
> 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.
>> 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 _
> ASCII ribbon campaign ( )
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> www: http://www.gid0.org - against proprietary attachments / \
> "Il y a seulement 10 sortes de gens dans le monde :
> ceux qui comprennent le binaire,
> et ceux qui ne le comprennent pas."
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