lvchange command changes LV attributes in the VG, changes LV activation in the kernel and includes other utilities for LV maintenance. For example, you may use lvchange while removing a disk from a Volume Group. Below outlined steps, provide a procedure to remove a disk from VG.
1. If a Physical Volume has a Logical Volume bindings, therefore unmount the volume and destroy it is needed:
# umount [mount point]
# lvchange -a n [LV path] 2. Remove the Logical Volume:
# lvremove [LV path]
3. Remove the Physical Volume from the Volume Group:
# vgreduce [volume group] [physical volume]
lvchange command examples
1. To control the availablability of logical volumes:
# lvchange -a LV00 # lvchange --available LV00 # lvchange -ay LV00 (To activate) # lvchange -an LV00 (To deactivate) # lvchange -aey LV00 (In Cluster - Activate in one node) # lvchange -aly LV00 (In Cluster - Activate in local node) # lvchange -aln LV00 (In Cluster - deactivate in local node)
2. To set or reset the contiguous allocation policy for logical volumes:
# lvchange -C y|n LV00 # lvchange --contiguous y|n LV00
3. To force the complete resynchronization of a mirror:
# lvchange --resync LV00
4. To set the minor number:
# lvchange --minor minor LV00
5. To start or stop monitoring a mirrored or snapshot logical volume with dmeventd:
# lvchange --monitor y|n LV00
6. To poll a logical volume to restart its previous incomplete transactions:
# lvchange --poll y|n LV00
7. To invoke lvchange from early system initialisation scripts (e.g. rc.sysinit or an initrd):
# lvchange --sysinit LV00
8. To disable udev synchronization:
# lvchange --noudevsync LV00
9. To make no attempt to interact with dmeventd unless –monitor is specified:
# lvchange --ignoremonitoring LV00
10. To set to y to make the minor number specified persistent:
# lvchange -M y|n LV00 # lvchange --persistent y|n LV00
11. To change access permission to read-only or read/write:
# lvchange -p r|rw LV00 # lvchange --permission r|rw LV00
12. To set read ahead sector count of this logical volume:
# lvchange -r ReadAheadSectors|auto|none LV00 # lvchange --readahead ReadAheadSectors|auto|none LV00
13. To reload the logical volume metadata:
# lvchange --refresh LV00