OnlySandy wrote:  Thanks Dynamox for clarification. I am trying to list the WWN to which the dev is masked. I use to give "symmaskdb -sid XXXX list assign -dev XXXX,XXXX" and it gives me list of HBA's and FA's to which devices are masked.  Again i checked in 7.0 pdf same commands is there only symmaskdb replaced by symaccess but its not working. I done "symmaccess -help " but cant find the "assign" option , so it obious that my command will not work.  So just wondering if anything such there or not !!!!!!!   is this what you are trying to do ?  $ symaccess -sid 123 list assignment -v -dev 00C7,00C9Symmetrix ID : 000000000123Device No.   : 00C7  WWN        : 10000000c9422fce  Type       : Fibre  Directors  : FA-7E:0,FA-8E:0,FA-7G:0,FA-8G:0Device No.   : 00C9  WWN        : 10000000c9422fce  Type       : Fibre  Directors  : FA-7E:0,FA-8E:0,FA-7G:0,FA-8G:0   One more thing , i saw most of the people they use Raid6 (6+2) when working with pool concept or thin provisionig. Why Raid6 only ?? Due to dedicated parity ?? Any ways any disk failure in raid will impact a huge number of thin devices a they are spread in backend. Thn why raid 6 not mirror . (Not raid 5 may be because  of distributed parity, correct me if i am wrong.)  you can use mirror, raid5 or raid6, it's all based on your protection and capacity requirements.  In our environment we don't have anything that requires mirror protection so we use raid 5 with our fiber channel drives. If we were to purchase big 2TB SATA drives i would probably consider RAID6 just because the rebuild times on those drives are high and i would be nervous about double drive failure. There is more parity overhead then raid5 but then again, i would not use SATA drives for performance sensitive apps.
In thinprovisioning , I belive the first device which we add to Pool ,the Pool will show dev config same as the config of device added to it. If i add Raid6(6+2) device to newly created pool , the pool will show Dev Config in symcfg list -pool as Raid6 (6+2) only.  Also i belive i wont be able to add amy 2-Way-Mirror device to pool having  Dev config of Raid6(6+2)  Also is there any command quivalent to symmask list assign -sid XXXX -devs in vmax. I checked in PDF it showing "symaccess list assignment -dev XXXX" but its not working at my place.
vmax pool dev config