Re: [BUG] Raid1/5 over iSCSI trouble

[Ming Zhang <blackmagic02881@gmail.com>]

On Fri, 2007-10-19 at 23:04 +0200, BERTRAND Joël 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
> 
> 	Sorry for this last mail. I have found another mistake, but I don't 
> know if this bug comes from iscsi-target or raid5 itself. iSCSI target 
> is disconnected because istd1 and md_d0_raid5 kernel threads use 100% of 
> CPU each !
> 
> Tasks: 235 total,   6 running, 227 sleeping,   0 stopped,   2 zombie
> Cpu(s):  0.1%us, 12.5%sy,  0.0%ni, 87.4%id,  0.0%wa,  0.0%hi,  0.0%si, 
> 0.0%st
> Mem:   4139032k total,   218424k used,  3920608k free,    10136k buffers
> Swap:  7815536k total,        0k used,  7815536k free,    64808k cached
> 
>    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND 
> 
>   5824 root      15  -5     0    0    0 R  100  0.0  10:34.25 istd1 
> 
>   5599 root      15  -5     0    0    0 R  100  0.0   7:25.43 
> md_d0_raid5
> 

i would rather use oprofile to check where cpu cycles went to.


> 	Regards,
> 
> 	JKB
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> _______________________________________________
> Iscsitarget-devel mailing list
> Iscsitarget-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel
-- 
Ming Zhang


@#$%^ purging memory... (*!%
http://blackmagic02881.wordpress.com/
http://www.linkedin.com/in/blackmagic02881
--------------------------------------------


-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/
_______________________________________________
Iscsitarget-devel mailing list
Iscsitarget-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel