Date: Tue, 03 Jan 2012 17:28:13 +0000 From: Matt Burke <mattblists@icritical.com> To: Peter Maloney <peter.maloney@brockmann-consult.de> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS v28 on -STABLE not using hot spare Message-ID: <4F033AAD.3080200@icritical.com> In-Reply-To: <4F031A7E.6090008@brockmann-consult.de> References: <4F031654.1080200@icritical.com> <4F031A7E.6090008@brockmann-consult.de>
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On 01/03/12 15:10, Peter Maloney wrote:
> On 01/03/2012 03:53 PM, Matt Burke wrote:
>> mfid16 FAULTED 0 931 0 too many errors
>
> Hot spare management is not part of the zfs system; it is part of the
> OpenSolaris "fault management daemon" which does not exist in FreeBSD.
OK, my mistake was that I took the man page to be correct:
Hot Spares
ZFS allows devices to be associated with pools as "hot spares". These
devices are not actively used in the pool, but when an active device
fails, it is automatically replaced by a hot spare.
Perhaps that section should be replaced with the text "DANGER: Hot spares
are not (currently) implemented in FreeBSD"?
It can't just be me who thought it would be a good idea to configure the
RAID controller to just export all the disks as JBOD and configure a few
hot spares under ZFS because:
a) the man page says you can
b) the userland command lets you do it
c) there's no documentation telling you it's non-functional
At least I'm aware of this now, so I can drop the spare drives on my other
ZFS machines and have the controllers deal with replacement, but I think
this is a pretty serious flaw in FreeBSD to tell users their data is safer
than it actually is...
If it's a good idea, I could attempt to make a patch to prevent zpool from
setting a drive as spare?
> And FYI there is a property you are supposed to set to get OpenSolaris
> FMD to replace a disk, so if it is implemented in some daemon you find
> or have, maybe this property is required:
Hmm, the same man page suggests that the autoreplace property only comes
into play once you've physically replaced the failed disk.
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