Differences

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--- lvm [2011/06/01 20:59] – created k2patel
+++ lvm [2020/08/10 02:35] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== LVM ======
-LVM you can increase / decrease size without any issue.
+LVM you can increase / decrease size without any issue.\\
 But it is important you do it in proper steps.
+==== Steps to create LVM from drive ====
+<code bash>
+pvcreate /dev/xvdf1
+pvdisplay /dev/xvdf1
+vgcreate -s 16M vg0 /dev/xvdf1
+vgdisplay /dev/xvdf
+vgdisplay vg0
+lvcreate -n lv-vol001 vg0
+lvcreate --help
+lvcreate -A n -L 24.5G -n lv-vol001 vg0
+mkfs.ext3 /dev/vg0/lv-vol001
+</code>
-==== Reducing Size : ====
+==== Add drive to LVM ====
+<code bash>
+# Rescan the machine if not found.
+echo "- - -" > /sys/class/scsi_host/host0/scan
+# Cont.
+fdisk /dev/xvdk ## Comment "Specify Type 8e by option t"
+mkfs.ext3 /dev/xvdk1
+pvcreate /dev/xvdk1
+vgextend vg0 /dev/xvdk1
+lvextend -L 300G /dev/vg0/lv-vol001
+OR
+lvextend -L+99.91G /dev/vg0/lv-vol001
+OR
+lvextend -l +100%FREE /dev/vg0/lv-vol001
+resize2fs /dev/vg0/lv-vol001
+</code>
+==== Reducing Size ====
 <code bash>
@@ Line 11: / Line 39: @@
 e2fsck -y /dev/mapper/VolGroup00-LogVol00
 resize2fs -f /dev/mapper/VolGroup00-LogVol00 1536M
-lvreduce -L1536M /dev/mapper/VolGroup00-LogVol00
+lvreduce -L-512M /dev/mapper/VolGroup00-LogVol00
 mount /home
 </code>
-==== Increasing Size : ====
+==== Increasing Size ====
 <code bash>
 umount /opt/
 e2fsck -y /dev/mapper/VolGroup00-LogVol02
 lvextend -L+512M /dev/mapper/VolGroup00-LogVol02
+OR
+lvextend -l +100%FREE /dev/mapper/VolGroup00-LogVol02
 resize2fs /dev/mapper/VolGroup00-LogVol02
 mount /opt
 </code>
+==== Worked Example on Live System ====
+<code bash | history>
+#rescan the device
+echo "- - -" > /sys/class/scsi_device/1\:0\:0\:0/device/rescan
+#list devices and confirm you are going to update which drive.
+fdisk -l
+### Delete and recreate the partition 'make sure start block is the same'
+fdisk /dev/sda ## Comment "Specify Type 8e by option t"
+### Reprobe partition table.
+partprobe -s
+mkfs.ext3 /dev/sda1
+vgextend VolGroup00 /dev/sda1
+lvdisplay
+vgdisplay
+lvextend -l+1599 /dev/VolGroup00/LogVol00
+df -kh
+vgdisplay
+lvdisplay
+resize2fs /dev/VolGroup00/LogVol00
+df -kh
+</code>