Troubleshooting
Problem
Mounts of copied zFS file systems might take over 1 minute each. This mount delay can be due to information in block zero of the aggregate not being cleared when it was previously mounted on the original system. The zFS address space checks the system name and a time stamp that are recorded in block zero, and will wait 65 seconds to see whether the time stamp is updated. If it is updated in that 65-second period, zFS will not mount the aggregate in order to prevent a system from writing to an aggregate that is mounted read/write on another system. See DOC APAR OA21703.
Symptom
BPXM056E UNIX SYSTEM SERVICES LATCH CONTENTION DETECTED
BPXP006E OMVS IS INITIALIZING THE FILE SYSTEM
IOEZ00807I In a wait to verify that aggregate ZFS.TST1.JAVA64A.VOTDALT.SAJV15D.ZFS has no other writers. Member ENG1 last wrote to the aggregate on Jun 20 12:48:27 2013.
BPXP006E OMVS IS INITIALIZING THE FILE SYSTEM
IOEZ00807I In a wait to verify that aggregate ZFS.TST1.JAVA64A.VOTDALT.SAJV15D.ZFS has no other writers. Member ENG1 last wrote to the aggregate on Jun 20 12:48:27 2013.
Cause
The following items can cause zFS to wait unnecessarily during a mount:
- Failing to unmount the zFS file systems before copying them to another system
- Making a volume copy of an active DASD volume on one system and mounting the volume copy on another system
- The zFS address space was not properly shut down when performing disaster recovery tests or preparing to IPL.
- Failing to unmount the zFS file systems before copying them to another system
- Making a volume copy of an active DASD volume on one system and mounting the volume copy on another system
- The zFS address space was not properly shut down when performing disaster recovery tests or preparing to IPL.
Diagnosing The Problem
The 65-second delay between the mounts of each zFS file system can be evident from reviewing the time stamp of each BPXF013I message that is output in SYSLOG.
Resolving The Problem
- Unmount the zFS file systems before copying them over to another system.
- Use the 'F OMVS,SHUTDOWN' or 'F OMVS,STOPPFS=ZFS' command to properly shut down zFS.
- Use the 'F OMVS,SHUTDOWN' or 'F OMVS,STOPPFS=ZFS' command to properly shut down zFS.
Related Information
[{"Product":{"code":"SWG90","label":"z\/OS"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":["5696EFS00 - ZSERIES FILE SYSTEM (ZFS)","5696EFS00 - ZSERIES FILE SYSTEM (ZFS)"],"Platform":[{"code":"PF035","label":"z\/OS"}],"Version":"N\/A","Edition":"","Line of Business":{"code":"LOB56","label":"Z HW"}}]
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Document Information
Modified date:
03 September 2021
UID
isg3T1011294