lvm
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lvm [2017/01/13 19:23] k2patel [Worked Example on Live System] |
lvm [2020/08/10 02:35] (current) |
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| + | ====== LVM ====== | ||
| + | |||
| + | 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> | ||
| + | |||
| + | ==== 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> | ||
| + | umount /home | ||
| + | e2fsck -y /dev/mapper/VolGroup00-LogVol00 | ||
| + | resize2fs -f /dev/mapper/VolGroup00-LogVol00 1536M | ||
| + | lvreduce -L-512M /dev/mapper/VolGroup00-LogVol00 | ||
| + | mount /home | ||
| + | </code> | ||
| + | |||
| + | |||
| + | ==== 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> | ||
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