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From: Nikolay Denev <ndenev@gmail.com>
Date: Wed, 26 Sep 2012 19:54:31 +0300
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To: Chuck Tuffli <ctuffli@gmail.com>
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Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>
Subject: Re: CAM Target Layer, Linux and camcontrol readcap
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On 26.09.2012, at 19:08, Chuck Tuffli <ctuffli@gmail.com> wrote:

> On Wed, Sep 26, 2012 at 9:02 AM, Nikolay Denev <ndenev@gmail.com> wrote:
> ...
>> I've did ctladm dumooa :
>>
>> Dumping OOA queues
>> LUN 0 tag 0x000d RTR: SYNCHRONIZE CACHE(10). CDB: 35 0 0 0 0 0 0 0 0 0
>> (91807313 ms)
>> LUN 0 tag 0x0011 BLOCKED: READ CAPACITY(10). CDB: 25 0 0 0 0 0 0 0 0 0
>> (35411180 ms)
>> LUN 0 tag 0x0012 BLOCKED: READ CAPACITY(10). CDB: 25 0 0 0 0 0 0 0 0 0
>> (35228663 ms)
>> LUN 0 tag 0x0013 BLOCKED: START STOP UNIT. CDB: 1b 0 0 0 1 0  (34721150 ms)
>> OOA queues dump done
>>
>>
>> And if I'm reading this right the other commands blocked because of the sync
>> cache.
>>
>> I will try now to set realsync to off before enabling the ports and retest.
>
> Yup, this is the symptom you will see unless realsync is off (ie. GEOM
> is barfing on the sync and this blocks subsequent commands from
> completing).
>
> ---chuck

Any idea if the machine can recover from this state without rebooting?