Unisphere for PowerMax: Disk Group 512 ENCAPSDG

RestAPI Endpoint for List Disk Group Keys returns diskGroupId 512:

The Disk Group also shows in CLI output using command:

symdisk list -dskgrp_summary -v

DX-type emulation is mainly used for representing external storage devices.

This was used for FAST.X (Fully Automated Storage Tiering for External storage - no longer supported) feature that allows PowerMax to extend its tiering and data services to external arrays.

With a VMAX3 array attached to external storage, FAST.X virtualized an external array's SCSI logical units as VMAX disks called eDisks which required Directors with DX emulation.

The presence of this emulation can be checked using the following command:

symcfg list -DX ALL

Symmetrix ID: 000123456789 (Local)

         S Y M M E T R I X    D I R E C T O R S

    Ident  Type          Engine  Cores  Ports  Status
    -----  ------------  ------  -----  -----  ------

    DX-1F  EDISK            1      7      4    Online
    DX-2F  EDISK            1      7      4    Online

The two DX directors above are configured with DX emulation.

That diskgroup is empty as seen in the output of:

symdisk list -sid 000123456789 -dskgrp_summary

Symmetrix ID: 000123456789

      Disk Group                 Disk          Hyper        Capacity
----------------------- ---------------------- ------ ---------------------
                            Flgs Speed  Size    Size     Total      Free
Num  Name                Cnt LT  (RPM)  (MB)    (MB)     (MB)       (MB)
----------------------- ---------------------- ------ ---------------------

1    DISK-GRP_1_          51 IE      0 7440111 116252  379445674          0
512  *ENCAPSDG*            0 --    N/A     N/A    N/A          0          0
                                                      ---------- ----------
Total                                                  379445674          0

Legend:
  Disk (L)ocation:
    I = Internal, X = External, - = N/A
  (T)echnology:
    C = SCM, E = EFD, F = FC, S = SATA, - = N/A

It is expected to have an external empty Disk Group for this emulation type DX.

Working as designed.

This Disk Group can be ignored.