ZFS stalled after some mirror disks were lost

[Ben RUBSON]

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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