Parallel Access Volume (PAV) support for ICKDSF available
Ingolf24 120000DRN3 Visits (4708)
In April we announced new functions for z/VSE 6.2 - see the anno
Besides the DL/I 1.12.1 partitioning delivered in June, there was another enhancement for IBM storage:
z/VSE will allow for the backup of data using ICKDSF while the z/VSE PAV (Parallel Access Volume) support is active and thus fulf
The enhancement is implemented for z/VSE 6.2 in APAR DY47803 and ICKDSF APAR PI99282.
z/VSE 6.2 APAR DY47803 (PTFs UD54342, UD54343): ENABLE PAV FOR ICKDSF FLASHCPY
Description: The objective of this line item is to fulfill Customer Requirement RFE 67101. With the enabling of PAV under z/VSE it may happen that the I/O requests from ICKDSF go through the alias address. There is no way to bypass this address selection by user, except disabling PAV. This may let FLASHCPY ESTABLISH function fail with ICK34058I. A new subroutine in IJBPAV will ensure, that certain I/O commands are issued on the PAV base address only. This function requires the following fix provided by ICKDSF - PTF: UI57038, APAR PI99282
ICKDSF APAR PI99282 (PTF UI57038): NEW FUNCTION - Z/VSE VERSION OF ICKDSF WILL USE BASE ADDRESS FOR PAV DEVICES WHEN USING CONTROL OR FLASHCPY COMMAND.
Description: The CONTROL CONFIG(DISPLAY) command was displaying the alias address if the I/O went to the alias address of a Parallel Access Volume. The FLASHCPY command may fail if I/O goes to the alias address of a Parallel Access Volume.
A few more words on PAV:
Parallel Access Volume (PAV) is an optional licensed feature on the IBM System Storage. Parallel access volumes are managed by creating multiple addresses for a single logical device. z/VSE supports one base device and up to 7 alias devices. With basic PAV support for ECKD devices z/VSE can access such a PAV device in parallel, which allow more than one I/O operation to be processed for a single logical device. This may give significant performance benefits dependent on your workload.
z/VSE's PAV support is described in the z/VSE Planning and z/VSE Administration books. We also have a PAV white paper on our z/VSE web page for technical articles here. The z/VSE books are in the PDF library on the z/VSE Knowledge Center - here