On 06/06/2012 09:27 PM, Brian Bunker wrote: > Our company produces a multiple port Fibre Channel storage array. We are continually plagued > by this problem. We get a dm device which combines paths for different LUN's. We would like > to understand why this is happening. Wouldn't this problem almost certainly lead to a data > corruption? > Most likely; given that the two LUNs indeed refer to different disks. > Thanks, > Brian > > 3624a93700a14254d729923840001000b dm-11 PURE,FlashArray > size=500G features='0' hwhandler='0' wp=rw > `-+- policy='round-robin 0' prio=1 status=active > |- 1:0:0:12 sde 8:64 failed faulty running > |- 0:0:0:12 sdd 8:48 failed faulty running > |- 0:0:0:10 sdar 66:176 active ready running > `- 1:0:0:10 sdba 67:64 active ready running > > Of the 4 paths to dm-11, we can see two paths are for LUN 10 and the other two are for LUN 12. > We have 24 other dm devices which have only the expected 2 paths. > Check the output of 'sg_vpd -p di /dev/sd(e|d|ar|ba)'. 'sde' and 'sdd' should be identical (well, the bits for 'Addressed logical unit' should be), as should 'sdar' and 'sdab'. 'sde' and 'sdar', on the other hand, should _not_. Given the above, however, I strongly suspect they are. Looks like your LUN WWID generation code is buggered. But I guess you can always blame Nic Bellinger :-) Greetings to Joern Engel. Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
