so once device is unmasked you need to make it write disabled, unmap it and then dissolve it (if it's a meta). If you want to list all devices that are mapped but not masked:  symmaskdb -sid 123 list no_assignment
Okay, now I need to reclaim the storage from an offline/decommissoned server.  I know the space is still reserved somewhere out there, even though the Symmetrix database says there's no devices attached to that server anymore.  First, the evidence:   Director Identification : FA-8D  ---------------- ----- --------------------------------- ------ ------ ------  Director Identification : FA-9D Director Port           : 0                              User-generated                      Logged On  Identifier       Type  Node Name        Port Name        FCID   In     Fabric ---------------- ----- --------------------------------- ------ ------ ------ 50060b0000c99a86 Fibre tan              fcd0             4a0400 Yes    Yes   I believe device 0060 was masked and attached to this server.  Why? Because I can't find 0060 attached to anything else on FA 8D:0 & 9D:0:  # symmaskdb list assignment -dev 0060     No device masking database records could be found for the specified input parameters   Symmetrix ID: xxxxxxxxxx28             # symdev list -dev 0060  Symmetrix ID: xxxxxxxxxxxx28          Device Name           Directors                  Device                 --------------------------- ------------- -------------------------------------                                                                            Cap  Sym  Physical               SA [IMAGE] DA :IT  Config        Attribute    Sts   (MB) --------------------------- ------------- -------------------------------------  0060 Not Visible            ***:* 01A:D1  RAID-6        N/Grp'd  (m) RW       -  # symmaskdb list capacity -host tan                  Symmetrix ID      : xxxxxxxxxx28  Host Name         : tan  Identifiers Found : 50060b0000111120                     50060b0000c99a86  Device  Cap(MB)  Attr  Dir:P      ------  -------  ----  ----       -----------------------------  MB Total:      0 GB Total:    0.0  And lastly.. device 0060 doesn't show up in the "noport" list.. so it's assigned to something.  # symdev list -noport | more  Symmetrix ID: xxxxxxxxx28          Device Name           Directors                  Device                 --------------------------- ------------- -------------------------------------                                                                            Cap  Sym  Physical               SA [IMAGE] DA :IT  Config        Attribute    Sts   (MB) --------------------------- ------------- -------------------------------------  0055 Not Visible            ???:? 01D:DA  2-Way Mir     N/Grp'd      RW       3 0056 Not Visible            ???:? 16A:CB  2-Way Mir     N/Grp'd      RW       3 01FE Not Visible            ???:? 01A:C0  RAID-6        N/Grp'd      RW   61425 01FF Not Visible            ???:? 01D:D2  RAID-6        N/Grp'd      RW   61425 020F Not Visible            ???:?  NA:NA  VDEV          N/Asst'd     NR   35723 ...  Device 0060 is just one example.  Is there anyway to reclaim this device so that I can "unmeta" it and return the devices back to the pool?  And is there anyway to identify other devices that were attached to the server which went offline and got decommissoned before I could return the space back to the pool?  Thanks.
Reclaim space from offline/decommissoned server