Unable to turn off dmp native support due to zdb command is failed.
Article ID: 100043974
Updated On:
Description
Error Message
# /opt/VRTS/bin/vxdmpadm settune dmp_native_support=off VxVM vxdmpadm ERROR V-5-1-15690 Operation failed for one or more zpoolsVxVM vxdmpadm ERROR V-5-1-15686 The following zpool(s) could not be migrated as failed to obtain root pool information - rpool
Cause
During disable dmp native support, below command is executed to find zpool information, but it is failing due to stale dmp device in the zpool cache file.
# zdb -C rpool
zdb: can't open pool 'rpool': No such file or directory
zdb reads the data from /etc/zfs/zpool.cache file, and it contains stale entries for dmp devices which is not exist any more:
# cat /etc/zfs/zpool.cache
....
path /dev/dsk/disk_1s0PHdevid -id1,dmp@n5000cca0708ee660/n5000cca0708ee660-aHH
This error can be fixed by recreate cache file with following command:
# zpool set cachefile=/etc/zfs/zpool.cache rpool
Or rebooting system which will recreate dmp device files as dmp native still enabled.
So, the problem is the native disable operation removes dmp devices, and 'zdb -C rpool' is trying to open those dmp device files, and gets "No such file or directory" error.
Resolution
To disable dmp native, you need to reset zpool cache just before run zdb command inside script like following:
Please add below line:
zpool set cachefile=/etc/zfs/zpool.cache rpool
To below script file:
/usr/lib/vxvm/bin/vxdmproot
Before below line:
558 $ZDB -C $ZFS_POOL > $ZFS_LOGDIR/$ZFS_POOL/config
Then, try disable dmp native support:
# /opt/VRTS/bin/vxdmpadm settune dmp_native_support=off
Issue/Introduction
