On Tue, 28 Nov 2006, Matthew Ahrens wrote:
> Elizabeth Schwartz wrote:
> > On 11/28/06, *David Dyer-Bennet* <[EMAIL PROTECTED] <mailto:[EMAIL
> > PROTECTED]>>
> > wrote:
> >
> > Looks to me like another example of ZFS noticing and reporting an
> > error that would go quietly by on any other filesystem. And if you're
> > concerned with the integrity of the data, why not use some ZFS
> > redundancy? (I'm guessing you're applying the redundancy further
> > downstream; but, as this situation demonstrates, separating it too far
> > from the checksum verification makes it less useful.)
> >
> >
> > Well, this error meant that two files on the file system were
> > inaccessible, and one user was completely unable to use IMAP, so I don't
> > know about unnoticeable.
>
> David said, "[the error] would go quietly by on any other filesystem".
> The point is that ZFS detected and reported the fact that your hardware
> corrupted the data. A different filesystem would have simply given your
> application the incorrect data.
>
> > How would I use more redundancy?
>
> By creating a zpool with some redundancy, eg. 'zpool create poolname
> mirror disk1 disk2'.
Or a 3-way mirror.... As others have said, it's likely that your hardware
RAID box has hardware/firmware bugs, that up to now, have gone by
unnoticed. It might also be time to upgrade the h/w RAID firmware and/or
the disk drive firmware for the drives that are installed in the h/w RAID
box.
In any case, ZFS will keep your h/w RAID supplier honest! Or ... it's
quite possible that you hardware RAID provider does not know that there is
a (nasty) bug(s) present. Think about that for a second.... Not a
pleasant thought for a production system!
Regards,
Al Hopper Logical Approach Inc, Plano, TX. [EMAIL PROTECTED]
Voice: 972.379.2133 Fax: 972.379.2134 Timezone: US CDT
OpenSolaris.Org Community Advisory Board (CAB) Member - Apr 2005
OpenSolaris Governing Board (OGB) Member - Feb 2006
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