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lvm basics
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== physical volumes ==
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# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 vg_790 lvm2 a-- 465.52g 211.52g
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list physical volumes
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# pvdisplay
# pvdisplay -C
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== volume groups ==
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# vgs
VG #PV #LV #SN Attr VSize VFree
vg_790 1 10 0 wz--n- 465.52g 211.52g
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list all volume groups
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# vgscan
# vgdisplay
# vgdisplay -C
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activate all
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# vgchange -ay
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deactivate a specific volume group
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# vgchange -an vol_group_1
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activate all logical volumes on a volume group, only
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# vgchange -ay vol_group_1
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== logical volumes ==
list logical volumes
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# lvs
# lvdisplay -C
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== Create a new LVM partition ==
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# lvcreate -L 10G -n /dev/vg_group01/lv_vol01
# mkfs.ext4 -L lv_vol01 /dev/vg_group01/lv_vol01
# mount /dev/vg_group01/lv_vol01 /media/
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== extend an lvm partition ==
How to extend an lvm partition:
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umount /opt/dnl
lvextend -L +5G /dev/vg01/dnl
e2fsck -f /dev/vg01/dnl
resize2fs /dev/vg01/dnl
mount /opt/dnl/
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== reduce ==
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# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_optfs 69G 44G 23G 66% /opt
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The goal is to reduce from 70G to 50G
==== umount ====
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# umount /opt/
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==== check filesystem ====
check a Linux ext2/ext3/ext4 file system
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# e2fsck -ff /dev/mapper/vg_xps-lv_optfs
e2fsck 1.43.9 (8-Feb-2018)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
optfs: 117811/4587520 files (0.4% non-contiguous), 11609065/18350080 blocks
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==== resize2fs filesystem ====
resize2fs - ext2/ext3/ext4 file system resizer
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# resize2fs /dev/mapper/vg_xps-lv_optfs 50G
resize2fs 1.43.9 (8-Feb-2018)
Resizing the filesystem on /dev/mapper/vg_xps-lv_optfs to 13107200 (4k) blocks.
The filesystem on /dev/mapper/vg_xps-lv_optfs is now 13107200 (4k) blocks long.
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==== LVM reduce ====
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# lvreduce -L -20G /dev/mapper/vg_xps-lv_optfs
WARNING: Reducing active logical volume to 50.00 GiB.
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce vg_xps/lv_optfs? [y/n]: y
Size of logical volume vg_xps/lv_optfs changed from 70.00 GiB (17920 extents) to 50.00 GiB (12800 extents).
Logical volume vg_xps/lv_optfs successfully resized.
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==== verify ====
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# mount /opt/
# df -h /opt/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_optfs 50G 44G 3.6G 93% /opt
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== resize to 100% ==
%%(bash)
# lvresize -l +100%FREE -n /dev/vg01/backup
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=== resize xfs ===
==== LVM resize ====
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# lvresize -l +100%FREE -n /dev/vg_xps/lv_Breach
Size of logical volume vg_xps/lv_Breach changed from 5.00 GiB (1280 extents) to <6.97 GiB (1784 extents).
Logical volume vg_xps/lv_Breach successfully resized.
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==== xfs grow ====
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# mount /opt/Breach
# df -h /opt/Breach
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_Breach 7.0G 7.0G 15M 100% /opt/Breach
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# xfs_growfs /opt/Breach
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meta-data=/dev/mapper/vg_xps-lv_Breach isize=512 agcount=6, agsize=327680 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1 spinodes=0 rmapbt=0
= reflink=0
data = bsize=4096 blocks=1826816, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 1826816 to 7069696
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# df -h /opt/Breach
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_xps-lv_Breach 27G 7.0G 20G 26% /opt/Breach
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