Date: Mon, 2 Oct 2017 20:12:03 +0200 From: Ben RUBSON <ben.rubson@gmail.com> To: Freebsd fs <freebsd-fs@freebsd.org> Subject: ZFS stalled after some mirror disks were lost Message-ID: <4A0E9EB8-57EA-4E76-9D7E-3E344B2037D2@gmail.com>
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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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