ZFS stalled after some mirror disks were lost

[Steven Hartland]

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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