ZFS stalled after some mirror disks were lost

[Ben RUBSON]

Before disconnecting the targets the pool was online without any issue.

> On 02 Oct 2017, at 20:17, Ben RUBSON <ben.rubson at gmail.com> wrote:
> 
> Unfortunately the command stalls / does not return :/
> 
>> On 02 Oct 2017, at 20:15, Steven Hartland <killing at multiplay.co.uk> wrote:
>> 
>> What does zpool status report when you have disconnected the iscsi targets?
>> 
>> On 02/10/2017 19:12, Ben RUBSON 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.
>>> 
>>> What happened :
>>> All IOs stalled, server only answers to IOs are made to its zroot pool.
>>> All commands related to the iSCSI disks (iscsictl), or to ZFS (zfs/zpool),
>>> don't return.
>>> 
>>> Questions :
>>> Why this behavior ?
>>> How to know what happens ? (/var/log/messages says almost nothing)
>>> 
>>> I already disconnected the iSCSI disks without any issue in the past,
>>> several times, but there were almost no IOs running.
>>> 
>>> Thank you for your help !
>>> 
>>> Ben
>>> 
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>> 
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>