Re: [BUG] Raid1/5 over iSCSI trouble

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

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

	Regards,

	JKB

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