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Re: [dm-devel] [PATCH] HP SW support take 3



On Mon, Jun 13, 2005 at 07:24:27PM -0500, Mike Christie wrote:
> Mike Christie wrote:
> >Christophe Varoqui wrote:
> >
> >>I confirm a robust behaviour now with take 3.
> >>Here is a take 4 that move to an appropriate "best effort mode", ie 
> >>always return success.
> >>
> >>The point is, whenever DM start submitting io the an asleep controler, 
> >>precede with a START command. If it fails ... too bad, the consecutive 
> >>io will fail and DM will try another PG. Had to do that because take 3 
> >>interprets an error where the controler switch have correctly happened.
> >>
> >
> >ok so is it if the controller is already failed over and we send the 
> >START command, rq->errors had some value so I ended up failing the 
> >operation, right? Let me send a patch that will dump the sense and 
> >rq->errors info out so we can see if there is some nice ASC/ASCQ value 
> >that will tell us this occured like with the LSI boxes.
> 
> oh wait, when I reread this I guess you are saying that I was always 
> gettting a rq->error value when I send a START_STOP and it succeeds?
> 
Here is a "sg_start -s 1" output that successfully activated the controler driving sdc :

[root s64p17bibrn ~]# sg_start -s 1 /dev/sdc
sync_cache: scsi status: Check Condition
Current, Sense key: Not Ready
[valid=0] Info fld=0x9000000, Additional sense: Logical unit not ready, initializing cmd. required
Raw sense data (in hex):
  70 00 02 09 00 00 00 0a 00 00 00 00 04 02 00 93 01 00
plus...: Driver_status=0x08 (DRIVER_SENSE,SUGGEST_OK)
start_stop: scsi status: Check Condition
Current, Sense key: Not Ready
[valid=0] Info fld=0x9000000, Additional sense: Logical unit not ready, initializing cmd. required
Raw sense data (in hex):
  70 00 02 09 00 00 00 0a 00 00 00 00 04 02 00 93 01 00
plus...: Driver_status=0x08 (DRIVER_SENSE,SUGGEST_OK)

Note subsequent sg_start don't spit any output, the controler is already activated :

[root s64p17bibrn ~]# sg_start -s 1 /dev/sdc
[root s64p17bibrn ~]#

Reactivating the first controler outs same sense as before :

[root s64p17bibrn ~]# sg_start -s 1 /dev/sda
sync_cache: scsi status: Check Condition
Current, Sense key: Not Ready
[valid=0] Info fld=0x9000000, Additional sense: Logical unit not ready, initializing cmd. required
Raw sense data (in hex):
  70 00 02 09 00 00 00 0a 00 00 00 00 04 02 00 93 01 00
plus...: Driver_status=0x08 (DRIVER_SENSE,SUGGEST_OK)
start_stop: scsi status: Check Condition
Current, Sense key: Not Ready
[valid=0] Info fld=0x9000000, Additional sense: Logical unit not ready, initializing cmd. required
Raw sense data (in hex):
  70 00 02 09 00 00 00 0a 00 00 00 00 04 02 00 93 01 00
plus...: Driver_status=0x08 (DRIVER_SENSE,SUGGEST_OK)



Hope it clarifies a bit.
Let me know if I can provide more.

I'm surprised HP guys don't join the party.
Decoding the sense would be easier for them.
Lacking they knowledge, I went for the best effort mode, though I agree it would be better to decode the sense.

Regards,
cvaroqui


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