Let’s assume that you have XFS formatted partition hosted on LVM named “/dev/vg1/gfs1” where “vg1” is the “volume group” and “gfs1” is the “logical volume”. You want to add an additional drive named “dev/xvdc” to the partition to increase storage. Here are the steps:
1. Partition the new drive with fdisk
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[root@web root]# fdisk /dev/xvdc Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0x88e6b2eb. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-13054, default 1): Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-13054, default 13054): Using default value 13054 Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [root@web root]# |
2. Setup /dev/xvdc1 as an LVM physical volume:
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[root@web root]# pvcreate /dev/xvdc1 Physical volume "/dev/xvdc1" successfully created |
3. Add /dev/xvdc1 to the LVM volume group:
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[root@web root]# vgextend vg1 /dev/xvdc1 Volume group "vg1" successfully extended |
You can show volume group detail to see the newly available storage:
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[root@web root]# vgdisplay vg1 --- Volume group --- VG Name vg1 System ID Format lvm2 Metadata Areas 3 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 3 Act PV 3 VG Size 279.99 GiB PE Size 4.00 MiB Total PE 71677 Alloc PE / Size 46078 / 179.99 GiB Free PE / Size 25599 / 100.00 GiB VG UUID 7muRk4-U3d4-QJfh-oXFU-REo1-cXI7-z0p1i4 |
Notice that “Free PE” is 100GB which is the size of our new /dev/xvdc drive.
4. Extend logical volume to use newly available storage:
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[root@web root]# lvextend -l +100%FREE /dev/vg1/gfs1 Extending logical volume gfs1 to 279.99 GiB Logical volume gfs1 successfully resized |
5. Grow the XFS filesystem on “gfs1”:
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[root@web root]# xfs_growfs /dev/vg1/gfs1 meta-data=/dev/mapper/vg1-gfs1 isize=256 agcount=10, agsize=5242624 blks = sectsz=512 attr=2, projid32bit=0 data = bsize=4096 blocks=47183872, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 log =internal bsize=4096 blocks=10239, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 47183872 to 73397248 |
And that’s it ..
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[root@web root]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/xvda1 41283904 29238956 9947852 75% / tmpfs 4014008 0 4014008 0% /dev/shm /dev/mapper/vg1-gfs1 293548036 182781980 110766056 63% /var/www/vhosts |
Of course there are lots of possible variations on the process. For example maybe you don’t want to allocate all of the free space to one single logical volume but these steps should provide a good starting place.