LVM: Extend an existing Logical Volume / Filesystem
Article Number: 163 | Rating: Unrated | Last Updated: Sat, Jun 2, 2018 10:15 PM
LVM: Extend an existing Logical Volume / Filesystem
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# Tested on RHEL 5, 6 & 7
# Concatenated volume # ------------------------------------------------------------------------------------------ MNTPT=/testmntpt SIZE=500 # Size to add in Mbytes VG=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f1 -d '-'` LV=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f2 -d '-'` df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 485M 11M 449M 3% /testmntpt lvs | grep $LV testlv testvg -wi-ao--- 500.00m # First, verify if there is enough free space in the VG vgdisplay $VG | grep Free Free PE / Size 391 / 1.53 GiB # Then, extend LV. Here size is given in Mbytes. To specify size in Logical Extents use '-l' lvextend -L +$SIZE /dev/$VG/$LV # ** Size to be added to volume may be specified as a percentage of remaining free space of # the volume group like this (in this case we take all available free space): # # lvextend -l +100%FREE -n /dev/$VG/$LV lvs | grep $LV testlv testvg -wi-ao--- 1012.00m # Finally, extend filesystem # For ext2/ext3 on RHEL 5 and ext2/ext3/ext4 on RHEL 6 & RHEL 7: resize2fs -p /dev/$VG/$LV resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/testvg/testlv is mounted on /testmntpt; on-line resizing required old desc_blocks = 2, new_desc_blocks = 4 Performing an on-line resize of /dev/testvg/testlv to 1036288 (1k) blocks. The filesystem on /dev/testvg/testlv is now 1036288 blocks long. # *** For ext4 F.S. on RHEL 5: # resize4fs -p /dev/$VG/$LV # *** For xfs F.S.: # xfs_growfs -d /dev/$VG/$LV df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 981M 11M 920M 2% /testmntpt # Striped volume # ------------------------------------------------------------------------------------------ MNTPT=/testmntpt SIZE=256 # Size to add in Mbytes VG=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f1 -d '-'` LV=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f2 -d '-'` df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 504M 17M 462M 4% /testmntpt lvs | grep $LV testlv testvg -wi-ao--- 512.00m # First, verify free space on volume group and disks vgdisplay -v $VG [...] Free PE / Size 388 / 1.52 GiB [...] --- Physical volumes --- PV Name /dev/sde1 <--- Used PV UUID DFfnXR-fjK3-V5Tz-oFHM-Py1T-rW4G-2DUz4f PV Status allocatable Total PE / Free PE 129 / 65 PV Name /dev/sde2 <--- Used PV UUID nQ3O7h-N8wH-FN9v-jmXu-5j5c-KZ25-IMUmGt PV Status allocatable Total PE / Free PE 129 / 65 PV Name /dev/sde3 PV UUID CT1trl-90zb-afrY-bCAM-0Xas-3Shs-hLCw2m PV Status allocatable Total PE / Free PE 129 / 129 PV Name /dev/sde4 PV UUID anN3BB-pafi-0ZE9-lpOw-Q0iL-EPiF-EQTUT0 PV Status allocatable Total PE / Free PE 129 / 129 # Then, extend LV. Here size is given in Mbytes. To specify size in Logical Extents use '-l' # We'll try to keep the distribution regarding striping over disks. In this case I'm adding # 256M and there is enough space on disks in use so it is not necessary to specify disks as # LVM will be able to allocate extents directly on them: lvextend -L +$SIZE /dev/$VG/$LV Extending logical volume testlv to 768.00 MiB Logical volume testlv successfully resized # Let's check what we did: vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 324 / 1.27 GiB VG Name testvg PV Name /dev/sde1 <--- Used Total PE / Free PE 129 / 33 PV Name /dev/sde2 <--- Used Total PE / Free PE 129 / 33 PV Name /dev/sde3 Total PE / Free PE 129 / 129 PV Name /dev/sde4 Total PE / Free PE 129 / 129 # Otherwise, if we want to add extents on specific disks, we may do it (Let's add 256 # additional MiB): SIZE=256 DISKS="/dev/sde3 /dev/sde4" lvextend -L +$SIZE /dev/$VG/$LV $DISKS Extending logical volume testlv to 1.00 GiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 260 / 1.02 GiB VG Name testvg PV Name /dev/sde1 Total PE / Free PE 129 / 33 PV Name /dev/sde2 Total PE / Free PE 129 / 33 PV Name /dev/sde3 <--- Used Total PE / Free PE 129 / 97 PV Name /dev/sde4 <--- Used Total PE / Free PE 129 / 97 # If we don't indicate disks, system will try to allocate extents on disks that were used # during the last 'extend' operation: SIZE=256 lvextend -L +$SIZE /dev/$VG/$LV Extending logical volume testlv to 1.25 GiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 196 / 784.00 MiB VG Name testvg PV Name /dev/sde1 Total PE / Free PE 129 / 33 PV Name /dev/sde2 Total PE / Free PE 129 / 33 PV Name /dev/sde3 <--- Used Total PE / Free PE 129 / 65 PV Name /dev/sde4 <--- Used Total PE / Free PE 129 / 65 # Finally, if there is no enough free space on disks that were used last, system will first # fill them up and then will allocate extents on the other disks SIZE=725 lvextend -L +$SIZE /dev/$VG/$LV Extending logical volume testlv to 1.96 GiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 14 / 56.00 MiB VG Name testvg PV Name /dev/sde1 <--- Used step 2 Total PE / Free PE 129 / 7 PV Name /dev/sde2 <--- Used step 2 Total PE / Free PE 129 / 7 PV Name /dev/sde3 <--- Used step 1 Total PE / Free PE 129 / 0 PV Name /dev/sde4 <--- Used step 1 Total PE / Free PE 129 / 0 # Let's see extent distribution: lvdisplay -m $VG/$LV [...] --- Segments --- Logical extent 0 to 191: Type striped Stripes 2 Stripe size 64.00 KiB Stripe 0: Physical volume /dev/sde1 <--- 1st extension Physical extents 0 to 95 Stripe 1: Physical volume /dev/sde2 <--- 1st extension Physical extents 0 to 95 Logical extent 192 to 449: Type striped Stripes 2 Stripe size 64.00 KiB Stripe 0: Physical volume /dev/sde3 <--- 2nd and 3rd extensions Physical extents 0 to 128 Stripe 1: Physical volume /dev/sde4 <--- 2nd and 3rd extensions Physical extents 0 to 128 Logical extent 450 to 501: Type striped Stripes 2 Stripe size 64.00 KiB Stripe 0: Physical volume /dev/sde1 <--- 4th extension Physical extents 96 to 121 Stripe 1: Physical volume /dev/sde2 <--- 4th extension Physical extents 96 to 121 # Anyway, try to maintain a "logical" distribution when extending a striped volume lvs | grep $LV testlv testvg -wi-a---- 1.96g # Finally, extend filesystem # For ext2/ext3 on RHEL 5 and ext2/ext3/ext4 on RHEL 6 & RHEL 7: resize2fs -p /dev/$VG/$LV resize2fs 1.42.9 (28-Dec-2013) Filesystem at /dev/testvg/testlv is mounted on /testmntpt; on-line resizing required old_desc_blocks = 1, new_desc_blocks = 1 The filesystem on /dev/testvg/testlv is now 514048 blocks long. # *** For ext4 F.S. on RHEL 5: # resize4fs -p /dev/$VG/$LV # *** For xfs F.S.: # xfs_growfs -d /dev/$VG/$LV df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 2.0G 788K 1.9G 1% /testmntpt # Mirrored volume # ------------------------------------------------------------------------------------------ MNTPT=/testmntpt SIZE=128 # Size to add in Mbytes VG=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f1 -d '-'` LV=`mount | awk '{if ( $3 == "'$MNTPT'" ) print$1}' | cut -f4 -d'/' | cut -f2 -d '-'` df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 248M 11M 226M 5% /testmntpt lvs | grep $LV testlv testvg mwi-aom-- 256.00m testlv_mlog 100.00 # First, verify free space on volume group and disks vgdisplay -v $VG [...] Free PE / Size 387 / 1.51 GiB [...] --- Physical volumes --- PV Name /dev/sde1 <--- Used PV UUID DFfnXR-fjK3-V5Tz-oFHM-Py1T-rW4G-2DUz4f PV Status allocatable Total PE / Free PE 129 / 65 PV Name /dev/sde2 <--- Used PV UUID nQ3O7h-N8wH-FN9v-jmXu-5j5c-KZ25-IMUmGt PV Status allocatable Total PE / Free PE 129 / 64 PV Name /dev/sde3 PV UUID CT1trl-90zb-afrY-bCAM-0Xas-3Shs-hLCw2m PV Status allocatable Total PE / Free PE 129 / 129 PV Name /dev/sde4 PV UUID anN3BB-pafi-0ZE9-lpOw-Q0iL-EPiF-EQTUT0 PV Status allocatable Total PE / Free PE 129 / 129 # Then, extend LV. Here size is given in Mbytes. To specify size in Logical Extents use '-l' # We'll try to keep the distribution regarding mirroring over disks. In this case I'm adding # 128M and there is enough space on disks in use so it is not necessary to specify disks as # LVM will be able to allocate extents directly on them: lvextend -L +$SIZE /dev/$VG/$LV Extending 2 mirror images. Extending logical volume testlv to 384.00 MiB Logical volume testlv successfully resized # Let's check what we did: vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 323 / 1.26 GiB VG Name testvg PV Name /dev/sde1 <--- Used Total PE / Free PE 129 / 33 PV Name /dev/sde2 <--- Used Total PE / Free PE 129 / 32 PV Name /dev/sde3 Total PE / Free PE 129 / 129 PV Name /dev/sde4 Total PE / Free PE 129 / 129 # Otherwise, if we want to add extents on specific disks, we may do it (Let's add 256 # additional MiB): SIZE=256 DISKS="/dev/sde3 /dev/sde4" lvextend -L +$SIZE /dev/$VG/$LV $DISKS Extending 2 mirror images. Extending logical volume testlv to 640.00 MiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 195 / 780.00 MiB VG Name testvg PV Name /dev/sde1 Total PE / Free PE 129 / 33 PV Name /dev/sde2 Total PE / Free PE 129 / 32 PV Name /dev/sde3 <--- Used Total PE / Free PE 129 / 65 PV Name /dev/sde4 <--- Used Total PE / Free PE 129 / 65 # If we don't indicate disks, system will try to allocate extents on disks that were used # during the last 'extend' operation: SIZE=250 lvextend -L +$SIZE /dev/$VG/$LV Extending 2 mirror images. Extending logical volume testlv to 892.00 MiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 69 / 276.00 MiB VG Name testvg PV Name /dev/sde1 Total PE / Free PE 129 / 33 PV Name /dev/sde2 Total PE / Free PE 129 / 32 PV Name /dev/sde3 <--- Used Total PE / Free PE 129 / 2 PV Name /dev/sde4 <--- Used Total PE / Free PE 129 / 2 # Finally, if there is no enough free space on disks that were used last, system will first # fill them up and then will allocate extents on the other disks SIZE=128 lvextend -L +$SIZE /dev/$VG/$LV Extending 2 mirror images. Extending logical volume testlv to 1020.00 MiB Logical volume testlv successfully resized vgdisplay -v $VG | egrep "VG Name|Free|PV Name" VG Name testvg Free PE / Size 5 / 20.00 MiB VG Name testvg PV Name /dev/sde1 <--- Used step 2 Total PE / Free PE 129 / 3 PV Name /dev/sde2 <--- Used step 3 Total PE / Free PE 129 / 2 PV Name /dev/sde3 <--- Used step 1 Total PE / Free PE 129 / 0 PV Name /dev/sde4 <--- Used step 1 Total PE / Free PE 129 / 0 # Anyway, try to maintain a "logical" distribution when extending a mirrored volume lvs | grep $LV testlv testvg mwi-aom-- 1020.00m testlv_mlog 100.00 # Finally, extend filesystem # For ext2/ext3 on RHEL 5 and ext2/ext3/ext4 on RHEL 6 & RHEL 7: resize2fs -p /dev/$VG/$LV resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/testvg/testlv is mounted on /testmntpt; on-line resizing required old desc_blocks = 1, new_desc_blocks = 4 Performing an on-line resize of /dev/testvg/testlv to 1044480 (1k) blocks. The filesystem on /dev/testvg/testlv is now 1044480 blocks long. # *** For ext4 F.S. on RHEL 5: # resize4fs -p /dev/$VG/$LV # *** For xfs F.S.: # xfs_growfs -d /dev/$VG/$LV df -h $MNTPT Filesystem Size Used Avail Use% Mounted on /dev/mapper/testvg-testlv 988M 11M 926M 2% /testmntpt |
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