[TriLUG] Disk drive recovery services

[David Burton via TriLUG]

When you said that three drives failed, how badly have they failed?

Are they casters-up dead-as-doornails?

Or just limping, with some bad sectors?


On Tue, Sep 22, 2020 at 5:26 PM Wes Garrison via TriLUG <trilug at trilug.org>
wrote:

> Joe,
>
> It wasn't the fault of ZFS.  I was using the notorious Seagate ST3000DM001,
> which is a consumer drive not meant for NAS (not meant for much of anything
> really).
>
> Out of the original 8, only 2 remain.  Worst failure rate I've ever seen.
>
> I was using a ZFS Z2 array (which can support 2 simultaneous failures), and
> had 3 simultaneous failures; the latter 2 occurring during re-silvering.
> This is pretty common, apparently.  When you have a failure and start
> hammering the drives to do a rebuild, you often have more failures.
>
> Lessons learned:
> 1) Use NAS drives or Seagate Exos for RAID/ZFS arrays, not crappy consumer
> drives.  If you buy WD, make sure you get CMR and don't get fleeced with
> SMR drives.
> 2) use ZFS Z3 for better fault tolerance
> 3) have an actual backup if practicable.  This is hard when your array is
> huge.  How do you back up an 18TB array when the largest available consumer
> drive is 4TB?  With another 18TB array, of course!
>
> -Wes
>
>
> On Tue, Sep 22, 2020 at 4:18 PM Mauricio Tavares via TriLUG <
> trilug at trilug.org> wrote:
>
> > On Tue, Sep 22, 2020 at 4:15 PM Joseph Mack NA3T via TriLUG
> > <trilug at trilug.org> wrote:
> > >
> > > On Tue, 22 Sep 2020, Wes Garrison via TriLUG wrote:
> > >
> > > > He was able to do head transplants on multiple drives that were part
> > of a ZFS
> > > > array and I was able to recover almost all of the data.
> > >
> > > I'm just starting out on zfs (at home) and I have little idea what
> > horrible
> > > things can happen to zfs or how I'm going to recover from them if they
> > do. I
> > > thought that no much could go wrong with zfs. So what happened to your
> > zfs
> > > array?
> > >
> >        To have truly horrible things  happen to your data you need a
> Drobo.
> >
> > > Joe
> > >
> > > --
> > > Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> > > jmack (at) wm7d (dot) net - azimuthal equidistant
> > > map generator at http://www.wm7d.net/azproj.shtml
> > > Homepage http://www.austintek.com/ It's GNU/Linux!
> > > --
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> This message was sent to: Dave Burton <ncdave4life at gmail.com>
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