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Status Not under consideration
Workspace z/VM
Created by Guest
Created on May 18, 2022

Support multiple PDR volumes for redundancy

Currently there can only be one PDR volume for an SSI cluster. If the storage host where the PDR volume resides goes down or something happens to that volume, all the systems in the cluster go down. Even if there are other storage host and a z/VM system in the cluster could stay up, it will crash with a CP abend PLM006. Right now, the only way to have redundancy for the PDR volume is to use GDPS which is complex and not accessible to smaller shops. Other systems such as Storwise storage hosts support multiple heartbeat disks. VMware also allows for multiple so that there is failover. I would like to see z/VM have multiple PDR volumes (at least 2) that could be on different storage hosts. In the event that one PDR volume "disappears" due to storage failure or other event, the remaining z/VM systems could stay up using the remaining PDR volume until normal operations are restored.

Idea priority High
  • Guest
    Reply
    |
    Aug 24, 2022
    z/VM SSI support is intended to help customers avoid planned outages. IBM GDPS support addresses unplanned outages for z/VM system(s). IBM has no plans at the present time to enhance the base z/VM product for this level of unplanned outage avoidance.