2006隨手札記

(2) Creating Logical Volumes 1. fdisk /dev/sdb (Partition Type: 8e) 2. pvcreate /dev/sdb2 3. vgcreate vg0 /dev/sdb2 4. lvcreate -L 100M -n data vg0 5. mkfs.ext3 /dev/vg0/data %check #pvs report information about physical volumes #vgs report information about volume groups #lvs report information about logical volumes %Resizing Logical Volumes #lvextend -L +50M /dev/vg0/data #resize2fs -p /dev/vg0/data %Reduce size (危險, 記得先備份資料) #umount /data #e2fsck -f /dev/vg0/data #resize2fs /dev/vg0/data 80M #lvreduce -L 80M /dev/vg0/data #mount /dev/vg0/data /data %remove #pvremove remove a physical volume #vgremove remove a volume group #lvremove remove a logical volume (3)Using LVM snapshots 1.create snapshot of existing logical volume #lvcreate -l 64 -s -n datasnap /dev/vg0/data -l: extend 64: 64*4MB -s: snapshots 2.mount snapshot #mkdir -p /mnt/datasnap #mount -o ro /dev/vg0/datasnap /mnt/datasnap 3.remove snapshot #umount /mnt/datasnap #lvremove /dev/vg0/datasnap