StorageTek HIPER - The Number of RTDs Used For Auto And Immediate Migrations Reduce Over Time

(Doc ID 1949939.1)

Last updated on OCTOBER 09, 2017

Applies to:

Sun StorageTek Enterprise Library Software (ELS) - Version 7.1 to 7.2 [Release 7.0]
Sun StorageTek Virtual Tape Control Software (VTCS) - Version 7.1 to 7.2 [Release 7.0]
IBM z/OS on System z

Symptoms

The number of RTDs used for auto and immediate migrations reduce over time.
Migrations show as waiting (e.g. in the response to Display MIG DET command), but do not get scheduled.
The Display MIGrate DETail (D MIG DET) command shows more active migration tasks than are actually in use for migration.
Backlog of VTVs in the auto migration queue.
Backlog of VTVs in the immediate migration queue.
DBU can climb above the HAMT.

VTSS buffer climbs above the migration threshold or possibly fills up.

The amount of wait time for migrations increases over time.

Changes

Installed the following PTFs:

ELS 7.1 -
L1H17VW
L1H17ZB

ELS 7.2 -
L1H17VX
L1H17ZE

Cause

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