Difference between revisions of "LVM"
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(all of these apply to both VM and physical systems) | (all of these apply to both VM and physical systems) | ||
| − | === | + | === Resizing Existing Mountpoints (adding more space) === |
1. if this is Enterprise 3 or older, umount partition (not needed under Ent 4 and newer) | 1. if this is Enterprise 3 or older, umount partition (not needed under Ent 4 and newer) | ||
| − | # umount /arsystem | + | # umount /home/arsystem |
2. check free space available | 2. check free space available | ||
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# mount /arsystem | # mount /arsystem | ||
| − | === | + | === Resizing Existing Mountpoints (reducing space) === |
1. if this is Ent 3 or older, umount partition (not needed under Ent 4 and newer) | 1. if this is Ent 3 or older, umount partition (not needed under Ent 4 and newer) | ||
| − | # umount /arsystem | + | # umount /home/arsystem |
2. check free space available | 2. check free space available | ||
# df -h | grep arsystem | # df -h | grep arsystem | ||
| − | /dev/mapper/pri-arsystem 199G 13M 198G 1% /arsystem | + | /dev/mapper/pri-arsystem 199G 13M 198G 1% /home/arsystem |
3. set desired space of partition | 3. set desired space of partition | ||
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4. if this is Ent 3 or older, mount partition (not needed under Ent 4 and newer) | 4. if this is Ent 3 or older, mount partition (not needed under Ent 4 and newer) | ||
| − | # mount /arsystem | + | # mount /home/arsystem |
| − | === | + | === Resizing SWAP === |
1. unmount swap (the one you want to resize - 'usually' there is only one) | 1. unmount swap (the one you want to resize - 'usually' there is only one) | ||
# swapoff /dev/pri/swap | # swapoff /dev/pri/swap | ||
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Swap: 4192924 0 4192924 | Swap: 4192924 0 4192924 | ||
| − | === | + | === Adding Partitions (existing space available) === |
1. create new logical volume; | 1. create new logical volume; | ||
# lvcreate -L 8G -n arsystem pri | # lvcreate -L 8G -n arsystem pri | ||
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3. make mountpoint; | 3. make mountpoint; | ||
| − | # mkdir /arsystem | + | # mkdir /home/arsystem |
4. add to fstab; | 4. add to fstab; | ||
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5. test fstab entry by mounting w/fstab info; | 5. test fstab entry by mounting w/fstab info; | ||
| − | # mount /arsystem | + | # mount /home/arsystem |
| − | === | + | === Removing Partitions (for re-allocating/freeing up space) === |
1. umount partition | 1. umount partition | ||
# umount /u001 | # umount /u001 | ||
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# vi /etc/fstab | # vi /etc/fstab | ||
| − | === Adding | + | === Snapshot Partitions === |
| + | create a snapshot of an existing LVM partition | ||
| + | # lvcreate -L 1G -s -n remedyss /dev/pri/remedy | ||
| + | Note: this can now be mounted and used to back up this frozen copy of your filesystem. To remove when done, follow Removing Partitions (above) | ||
| + | |||
| + | === Restore Snapshots === | ||
| + | 1. unmount the partition to make sure nothing else can write to it while restoring | ||
| + | # umount /dev/pri/remedy | ||
| + | 2. merge the snapshot back into the original partition | ||
| + | # lvconvert --merge /dev/pri/remedyss | ||
| + | |||
| + | === Adding New Drives (existing space NOT available) === | ||
(this step assumes you added a new drive, whether physical for a physical sys, or virtual for a virtual sys) | (this step assumes you added a new drive, whether physical for a physical sys, or virtual for a virtual sys) | ||
1. create a single partition as type LVM (8e) for the whole drive | 1. create a single partition as type LVM (8e) for the whole drive | ||
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# vgcreate sec /dev/sdb1 | # vgcreate sec /dev/sdb1 | ||
| − | === | + | === Renaming Volume Group & Logical Volume Names === |
*Rename Logical Volume (partition name)* | *Rename Logical Volume (partition name)* | ||
# lvrename /dev/pri/HomeVol home | # lvrename /dev/pri/HomeVol home | ||
Latest revision as of 17:08, 21 October 2017
(all of these apply to both VM and physical systems)
Contents
- 1 Resizing Existing Mountpoints (adding more space)
- 2 Resizing Existing Mountpoints (reducing space)
- 3 Resizing SWAP
- 4 Adding Partitions (existing space available)
- 5 Removing Partitions (for re-allocating/freeing up space)
- 6 Snapshot Partitions
- 7 Restore Snapshots
- 8 Adding New Drives (existing space NOT available)
- 9 Renaming Volume Group & Logical Volume Names
Resizing Existing Mountpoints (adding more space)
1. if this is Enterprise 3 or older, umount partition (not needed under Ent 4 and newer)
# umount /home/arsystem
2. check free space available
# vgdisplay pri | grep "Free PE" Free PE / Size 1413 / 44.16 GB
3. add desired space to partition
Ent 7 # lvextend -l +1413 -r /dev/pri/arsystem OR # lvextend -l +1413 /dev/pri/arsystem # xfs_growfs /dev/pri/arsystem Ent 5/6 # lvextend -l +1413 -r /dev/pri/arsystem OR # lvextend -l +1413 /dev/pri/arsystem # resize2fs /dev/pri/arsystem Ent 4 only (e2fsadm not avail on Ent 4); # lvextend -l +1413 /dev/pri/arsystem # ext2online /dev/pri/arsystem Ent 3 only; # e2fsadm -l +1413 /dev/pri/arsystem
Note: if you run this command and the fsck gives errors, fix the errors by running fsck manually, and then run the command again (it will not do it's resizing until fsck runs cleanly)
4. if this is Ent 3 or older, mount partition (not needed under Ent 4 and newer)
# mount /arsystem
Resizing Existing Mountpoints (reducing space)
1. if this is Ent 3 or older, umount partition (not needed under Ent 4 and newer)
# umount /home/arsystem
2. check free space available
# df -h | grep arsystem /dev/mapper/pri-arsystem 199G 13M 198G 1% /home/arsystem
3. set desired space of partition
Ent 7 NOTE: if reducing xfs, backup your data, you have to recreate the filesystem, all will be lost! # lvreduce -L 10G /dev/pri/arsystem # mkfs -t xfs /dev/pri/arsystem Ent 5/6 # lvreduce -L 10G /dev/pri/arsystem # resize2fs /dev/pri/arsystem Ent 4 only (e2fsadm not avail on Ent 4); # lvreduce -L 10G /dev/pri/arsystem # ext2online /dev/pri/arsystem Ent 3 only; # e2fsadm -L 10G /dev/pri/arsystem
Note: if you run this command and the fsck gives errors, fix the errors by running fsck manually, and then run the command again (it will not do it's resizing until fsck runs cleanly)
4. if this is Ent 3 or older, mount partition (not needed under Ent 4 and newer)
# mount /home/arsystem
Resizing SWAP
1. unmount swap (the one you want to resize - 'usually' there is only one)
# swapoff /dev/pri/swap
2. check free space, then add desired space to partition
# vgdisplay pri | grep "Free PE" Free PE / Size 1413 / 44.16 GB # lvextend -L +4g /dev/pri/swap
3. rebuild swap filesystem (there is no swap resize command)
# mkswap /dev/pri/swap
4. re-enable swap
# swapon /dev/pri/swap
5. verify using 'free' command that new size is in use
# free | grep Swap Swap: 4192924 0 4192924
Adding Partitions (existing space available)
1. create new logical volume;
# lvcreate -L 8G -n arsystem pri OR; to use all of the remaining space, check "Free PE" from vgdisplay, then use -l option instead of -L, example; # vgdisplay pri | grep "Free PE" Free PE / Size 1413 / 44.16 GB # lvcreate -l 1413 -n arsystem pri
2. create filesystem;
Ent 7 # mkfs -t xfs /dev/pri/arsystem Ent 6 # mkfs -t ext4 /dev/pri/arsystem Ent 5 or earlier # mkfs -t ext3 /dev/pri/arsystem
3. make mountpoint;
# mkdir /home/arsystem
4. add to fstab;
# vi /etc/fstab
5. test fstab entry by mounting w/fstab info;
# mount /home/arsystem
Removing Partitions (for re-allocating/freeing up space)
1. umount partition
# umount /u001
2. remove LVM volume
# lvremove /dev/pri/u001
3. remove from fstab
# vi /etc/fstab
Snapshot Partitions
create a snapshot of an existing LVM partition
# lvcreate -L 1G -s -n remedyss /dev/pri/remedy
Note: this can now be mounted and used to back up this frozen copy of your filesystem. To remove when done, follow Removing Partitions (above)
Restore Snapshots
1. unmount the partition to make sure nothing else can write to it while restoring
# umount /dev/pri/remedy
2. merge the snapshot back into the original partition
# lvconvert --merge /dev/pri/remedyss
Adding New Drives (existing space NOT available)
(this step assumes you added a new drive, whether physical for a physical sys, or virtual for a virtual sys) 1. create a single partition as type LVM (8e) for the whole drive
# fdisk /dev/sdb
Note: if the new drive was added to a 'live' system, and it is not showing under 'fdisk -l', rescan with (may need to do this with more than host0, i.e. host0, host1, etc.):
echo "- - -" > /sys/class/scsi_host/host0/scan
2. initialize new drive as LVM
# pvcreate /dev/sdb1
3. add new drive to existing LVM volume
# vgextend pri /dev/sdb1 OR # vgcreate sec /dev/sdb1
Renaming Volume Group & Logical Volume Names
- Rename Logical Volume (partition name)*
# lvrename /dev/pri/HomeVol home
(make sure to update fstab with the change)
- Rename Volume Group*
# vgrename VolGroup00 pri
(make sure to update fstab with the change)
