VMAX TDEV unbind is taking lot of time

Hello Admins,

I have a 16 GB TDEV which am trying to unbind and it has been 30 mins now and the device is still in unbinding state. The COMMIT operation runs fine but as I check on the unbind status, it shows unbinding.

Symmetrix Command Line Interface (SYMCLI) Version V7.5.0.0 (Edit Level: 1604)

built with SYMAPI Version V7.5.0.0 (Edit Level: 1604)

Code: 5876

# symcfg -sid 1234  list -tdev -gb -devs 16B1

Symmetrix ID: 000000000001234

Enabled Capacity (GBs) :    98160.7

Bound   Capacity (GBs) :       16.9

                 S Y M M E T R I X   T H I N   D E V I C E S

------------------------------------------------------------------------------

                                         Total          Total       Compressed

       Bound      Flgs      Total      Allocated       Written      Size/Ratio

Sym  Pool Name    EMPT        GBs        GBs (%)        GBs (%)        GBs (%)

---- ------------ ---- ---------- ---------- --- ---------- --- ---------- ---

16B1 fc_600_3r5   F..U       16.9        3.1  18        3.1  18        3.1   0

Total                  ---------- ---------- --- ---------- --- ---------- ---

  GBs                        16.9        3.1   0        3.1   0        3.1   0

Legend:

Flags:  (E)mulation : A = AS400, F = FBA, 8 = CKD3380, 9 = CKD3390

         (M)ultipool : X = multi-pool allocations, . = single pool allocation

         (P)ersistent Allocs : A = All, S = Some, . = None

         S(T)atus    : B = Bound, I = Binding, U = Unbinding, A = Allocating,

                       D = Deallocating, R = Reclaiming, C = Compressing,

                       N = Uncompressing, . = Unbound,

# symcfg -sid 1234 show -pool fc_600_3r5 -thin -detail | more

Symmetrix ID: 0000000001234

Symmetrix ID                     : 0000000001234

Pool Name                        : fc_600_3r5

Pool Type                        : Thin

Disk Location                    : Internal

Technology                       : FC

Dev Emulation                    : FBA

Dev Configuration                : RAID-5(3+1)

Pool State                       : Enabled

Compression State                : Disabled

# of Devices in Pool             :  96

# of Enabled Devices in Pool     :  96

# of Usable Tracks in Pool       : 316609920

# of Allocated Tracks in Pool    : 202018392

# of Tracks saved by compression :   0

# of Shared Tracks in Pool       :   0

Pool Utilization (%)             :  63

Pool Compression Ratio (%)       :   0

Max. Subscription Percent        : 100

Rebalance Variance               :   1%

Max devs per rebalance scan      : 256

Pool Reserved Capacity           : None

What could be the reason behind this. I have almost 20 devices which I have to unbind from the same pool.

Thanks in advance.

~Taz