Error V-3-20005 and V-3-24996 while mounting VVR replicated filesystem as read only on secondary

Are you getting below error when trying to mount Veritas VVR replicated volume on secondary in read only mode?

root@secondary ~]# mount -t vxfs -o ro /dev/vx/dsk/product_dg  /mnt
UX:vxfs mount.vxfs: ERROR: V-3-20005: read of super-block on /dev/vx/dsk/product_dg/product_vol failed: Input/output error
UX:vxfs mount.vxfs: ERROR: V-3-24996: Unable to get disk layout version


Solution

Error is misleading !

Check RVG status. Most probably it is in DISABLE state. volume group is an object of replicated RVG. If RVG is disable, even volumes are started (ENABLED), it is not usable.

root@secondary ~]# vxprint -rt |grep ^rv
rv product_rvg      1            DISABLED CLEAN    secondary 3        srl_vol

Actions

1- Start RVG

vxrvg -g product_dg start product_rvg


2- Verify if rvg is enabled

root@secondary ~]# vxprint -rt |grep ^rv
rv product_rvg      1            ENABLED CLEAN    secondary 3        srl_vol


3-Mount filesystem as read only . NOTE- it is not recommended to mount replicated volume in even read-only on secondary )

root@secondary ~]# mount -t vxfs -o ro /dev/vx/dsk/product_dg  /mnt
root@secondary ~]#


Did this post help you ?