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Date:      Mon, 2 Oct 2017 20:17:13 +0200
From:      Ben RUBSON <ben.rubson@gmail.com>
To:        Freebsd fs <freebsd-fs@freebsd.org>
Subject:   Re: ZFS stalled after some mirror disks were lost
Message-ID:  <8A189756-028A-465E-9962-D0181FAEBB79@gmail.com>
In-Reply-To: <71d4416a-3454-df36-adae-34c0b70cd84e@multiplay.co.uk>
References:  <4A0E9EB8-57EA-4E76-9D7E-3E344B2037D2@gmail.com> <71d4416a-3454-df36-adae-34c0b70cd84e@multiplay.co.uk>

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Unfortunately the command stalls / does not return :/

> On 02 Oct 2017, at 20:15, Steven Hartland <killing@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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