ZFS stalled after some mirror disks were lost
Miroslav Lachman
000.fbsd at quip.cz
Mon Oct 2 19:30:07 UTC 2017
Adam Vande More wrote on 10/02/2017 20:44:
> On Mon, Oct 2, 2017 at 1:12 PM, Ben RUBSON <ben.rubson at gmail.com> wrote:
>
>> Hi,
>>
>> On a FreeBSD 11 server, the following online/healthy zpool :
>>
>> home
>> mirror-0
>> label/local1
>> label/local2
>> label/iscsi1
>> label/iscsi2
>> mirror-1
>> label/local3
>> label/local4
>> label/iscsi3
>> label/iscsi4
>> cache
>> label/local5
>> label/local6
>>
>> A sustained read throughput of 180 MB/s, 45 MB/s on each iscsi disk
>> according to "zpool iostat", nothing on local disks (strange but I
>> noticed that IOs always prefer iscsi disks to local disks).
>> No write IOs.
>>
>> Let's disconnect all iSCSI disks :
>> iscsictl -Ra
>>
>> Expected behavior :
>> IO activity flawlessly continue on local disks.
>>
>
> Perhaps I'm misunderstanding your setup, but my expected behavior would be
> exactly what you see. I think you'd need something more along the lines of:
>
> home
> mirror
> label/local1
> label/iscsi1
> mirror
> label/local2
> label/iscsi2
> etc...
The OP has four way mirror. It is supposed to work even if 3 devices are
missing. Just 1 device should be enough.
Miroslav Lachman
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