After an I/O failure to a PV due to a down path or a system crash, a volume group may have a disk in a removed state:

# lsvg -p rootvg
rootvg
PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION
hdisk1 removed 432 136 76..00..00..00..60
hdisk2 active 432 136 76..00..00..00..60
We can use chpv to change the status of the PV back to active:

# chpv -va hdisk1
# syncvg -P 4 -v rootvg

The switch ‘-P 4’ to syncvg may be used to speed up the synchronization process by syncing 4 PPs in parallel.