[zfs-discuss] ZFS on single drive?

Ryan How ryan at bitworks.com.au
Thu Jan 7 00:18:06 EST 2016


The USB issue happens to me too.

I haven't tested it with failmode=continue yet.

It was on the forum a little while back, but I can't remember which 
thread. That was where I learnt about failmode = continue;

On 7/01/2016 12:47 AM, Joao Carlos Mendes Luis wrote:
> Here's my experience:
>
> I've been using sigle disk ZFS as a removable 
> backup+snapshot+compression solution in a USB removable drive for years.
>
> Works perfectly, but it has a single drawback: It does not recover 
> well from USB errors.
>
> Example: I attach/import the disk and initiate backup.  I usually 
> detach/export the disk after finishing rsync, but sometimes I just 
> forget, and simply remove the disk from USB. When this happens the ZFS 
> subsystem goes crazy, and I cannot do anything else until reset the 
> machine.  Sometimes only the ZFS access is affected.  Some times the 
> whole system freezes.
>
> I never changed the failmode setting, so I believe (I am not near my 
> notebook right now) it is on its default, wait.  Anyway, reinserting 
> the USB disk DOES NOT recover the failure.  I'll try changing it to 
> "continue" and test again ASAP.
>
> Just my two cents (and hoping for some good soul to find a bug here).
>
> On 01/06/2016 03:55 AM, Ryan How via zfs-discuss wrote:
>> Can I suggest setting failmode to continue on the pool so it doesn't 
>> hang on failure.
>>
>> Has anyone got any recommendations with that?
>>
>> In the event of total disk failure I would feel that the data isn't 
>> as recoverable, but others opinions may differ. You should have 
>> backups anyway. I've had some pretty dead ext4 drives that I've 
>> managed to run ddrescue and retrieve a good portion of the data. I 
>> don't think you'd recover ZFS as easily. - But that said you should 
>> always have backups unless you don't care about your data.
>>
>> Ryan
>>
>>
>>
>>
>> On 6/01/2016 8:02 AM, Schlacta, Christ via zfs-discuss wrote:
>>>
>>> Most of my systems have single disks with copies=2, then zfs send to 
>>> my media server with a raidz2. I feel especially secure knowing that 
>>> my laptop will function correctly through anything short of an 
>>> abject disk failure.
>>>
>>> On Jan 5, 2016 2:24 PM, "Dan Swartzendruber via zfs-discuss" 
>>> <zfs-discuss at list.zfsonlinux.org 
>>> <mailto:zfs-discuss at list.zfsonlinux.org>> wrote:
>>>
>>>
>>>     I use a hotplug SATA 1TB drive for monthly backups (3rd tier). 
>>>     I then scrub the pool and ensure it went okay before calling it
>>>     a day.  I sure prefer know that to just hoping...
>>>     _______________________________________________
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>>>
>>>
>>>
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>>
>>
>>
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>
>
>     Atenciosamente,
>
>         Jonny
>
> -- 
> João Carlos Mendes Luís
> Globo.COM - +55-21-2483-6893
>

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