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Old 08-11-2011, 05:19 AM
"Moger, Babu"
 
Default multipath-tools: service mode changes for RDACstorage

Christophe,
Do you have any comments on this? If not can you please merge this..
Thanks
Babu

> -----Original Message-----
> From: Moger, Babu
> Sent: Monday, July 25, 2011 7:05 AM
> To: device-mapper development
> Cc: Kumar, Vijay; Dachepalli, Sudhir; Krishnasamy, Somasundaram; Qi,
> Yanling; Stankey, Robert
> Subject: [dm-devel] [PATCH] multipath-tools: service mode changes for
> RDACstorage
>
> This patch handles the recent changes in NetApp RDAC storage firmware to
> report service mode. Firmware changed the inquiry page 0xc9 to report
> service mode. Purpose this change is to avoid DMMP going into infinite
> loop of switching back and forth between controllers when a controller
> is placed in service mode. This fixes the problem and reports the path
> as failed if the controller is placed in service mode.
>
> Signed-off-by: Babu Moger <babu.moger@netapp.com>
> Reviewed-by: Yanling Qi <yanling.qi@netapp.com>
> Reviewed-by: Somasundaram Krishnasamy
> <Somasundaram.Krishnasamy@netapp.com>
>
> ---
> --- multipath-tools-0.4.8/libmultipath/checkers/rdac.c.orig 2011-07-06
> 16:37:43.000000000 -0500
> +++ multipath-tools-0.4.8/libmultipath/checkers/rdac.c 2011-07-25
> 06:38:03.000000000 -0500
> @@ -198,7 +198,10 @@ struct volume_access_inq
> char PQ_PDT;
> char dontcare0[7];
> char avtcvp;
> - char dontcare1[39];
> + char dontcare1;
> + char asym_access_state_cur;
> + char vendor_specific_cur;
> + char dontcare2[36];
> };
>
> extern int
> @@ -216,6 +219,14 @@ libcheck_check (struct checker * c)
> ret = PATH_DOWN;
> goto done;
> }
> +
> + /* check if controller is in service mode */
> + if ((inq.avtcvp & 0x10) &&
> + ((inq.asym_access_state_cur & 0x0F) == 0x3) &&
> + (inq.vendor_specific_cur == 0x7)) {
> + ret = PATH_DOWN;
> + goto done;
> + }
>
> /* If owner set or ioship mode is enabled return PATH_UP always */
> if ((inq.avtcvp & 0x1) || ((inq.avtcvp >> 5) & 0x1))
>
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

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