Re: [BUG] Raid1/5 over iSCSI trouble

["BERTRAND Joël" <joel.bertrand@systella.fr>]

Ross S. W. Walker wrote:
> BERTRAND Joël wrote:
>> BERTRAND Joël wrote:
>>> Bill Davidsen wrote:
>>>> Dan Williams wrote:
>>>>> On Fri, 2007-10-19 at 01:04 -0700, BERTRAND Joël wrote:
>>>>>  
>>>>>>         I run for 12 hours some dd's (read and write in nullio)
>>>>>> between
>>>>>> initiator and target without any disconnection. Thus 
>> iSCSI code seems
>>>>>> to
>>>>>> be robust. Both initiator and target are alone on a 
>> single gigabit
>>>>>> ethernet link (without any switch). I'm investigating...
>>>>>>     
>>>>> Can you reproduce on 2.6.22?
>>>>>
>>>>> Also, I do not think this is the cause of your failure, 
>> but you have
>>>>> CONFIG_DMA_ENGINE=y in your config.  Setting this to 'n' 
>> will compile
>>>>> out the unneeded checks for offload engines in async_memcpy and
>>>>> async_xor.
>>>> Given that offload engines are far less tested code, I 
>> think this is a 
>>>> very good thing to try!
>>>     I'm trying wihtout CONFIG_DMA_ENGINE=y. istd1 only uses 
>> 40% of one 
>>> CPU when I rebuild my raid1 array. 1% of this array was now 
>>> resynchronized without any hang.
>>>
>>> Root gershwin:[/usr/scripts] > cat /proc/mdstat
>>> Personalities : [raid1] [raid6] [raid5] [raid4]
>>> md7 : active raid1 sdi1[2] md_d0p1[0]
>>>       1464725632 blocks [2/1] [U_]
>>>       [>....................]  recovery =  1.0% 
>> (15705536/1464725632) 
>>> finish=1103.9min speed=21875K/sec
>> 	Same result...
>>
>> connection2:0: iscsi: detected conn error (1011)
>>  
>>           session2: iscsi: session recovery timed out after 120 secs
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
>> sd 4:0:0:0: scsi: Device offlined - not ready after error recovery
> 
> I am unsure why you would want to setup an iSCSI RAID1, but before
> doing so I would try to verify that each independant iSCSI session
> is bullet proof.

	I use one and only one iSCSI session. Raid1 array is built between a 
local and iSCSI volume.

	JKB

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