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Re: [dm-devel] Question about dm-multipath and Sun StorageTek 6140



Hi Yury,

thanks for Your hints, I had the same problem an figured it out now.

>> - is it true that I need a hardware-specific handler for arrays running
>>   with active/passive controllers (like the Sun StorageTek 6140) to
>>   get the the LUN trespassing working?
> 
> It's true only for non-AVT mode (set host type to Linux to turn AVT mode on)

at least for the 6140 this is not correct. It sets the mode to RDAC for the
Sun-RDAC-Driver ( http://www.sun.com/download/products.xml?id=44d12115 ).

You have to choose 'Solaris (with Veritas DMP or other)' (named SOLAVT in the
CLI) to enable AVT.
 
>> - did someone get the Sun StorageTek 6140 configured for dm-multipath?
>>   (so that the LUN trespassing works)
> 
> It should work as it does for other boxes with LSILogic controllers.
> 
> path_grouping_policy    group_by_prio
> path_checker            tur
> prio_callout            "/sbin/mpath_prio_tpc /dev/%n"

Correct, with this setup and AVT enabled LUN trespassing works as designed:

multipathd> show maps topo
reload: Raid5_for_IMAP-Volume (3600a0b800026851e000014e245bf1906) dm-0
SUN,CSM200_R
[size=1.4T][features=0][hwhandler=0]
\_ round-robin 0 [prio=12][active]
 \_ 7:0:2:1 sdah 66:16  [active][ready]
 \_ 6:0:0:1 sdd  8:48   [active][ready]
\_ round-robin 0 [prio=2][enabled]
 \_ 6:0:2:1 sdn  8:208  [active][ready]
 \_ 7:0:0:1 sdx  65:112 [active][ready]

and after failure of preferred controller:

multipathd> show maps topo
reload: Raid5_for_IMAP-Volume (3600a0b800026851e000014e245bf1906) dm-0
SUN,CSM200_R
[size=1.4T][features=0][hwhandler=0]
\_ round-robin 0 [prio=0][enabled]
 \_ 7:0:2:1 sdah 66:16  [failed][faulty]
 \_ 6:0:0:1 sdd  8:48   [failed][faulty]
\_ round-robin 0 [prio=6][active]
 \_ 6:0:2:1 sdn  8:208  [active][ready] 
 \_ 7:0:0:1 sdx  65:112 [active][ready] 

Great software!

Regards,
Eckebrecht

-- 
Eckebrecht von Pappenheim, network administration 
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