When it comes to a situation that the disk space is not enough on a virtual machine, it’s easy to extend the disk space if it’s on LVM, even the \/root partition.<\/p>\n
This post<\/a> is very helpful.<\/p>\n For my own memo: On \/dev\/sda2 Goal: Add 8G extra space to \/dev\/mapper\/vg_node1-lv_root<\/p>\n Steps: 2. Memo the current cylinder start number of \/dev\/sda2 3. Delete partition \/dev\/sda2 then recreate it with the new size Reboot the VM<\/p>\n Now the partition size is changed. I need to change the pv size and vg size.<\/p>\n 5. Change pv size 6. Change vg size 7. Still need to increase file system size ————————————————————————- 1. Add disk space from vmware GUI, however the following command didn’t work, so reboot 2. frisk -l shows new disk space on \/dev\/sda 3. fdisk shows \/dev\/sda3, the new partition created. 4. Create a new physical volume on lvm using sda3 5. find vg name from vgdisplay, find vg name is using “centos”, add sda3 to virtual group 6. pvscan shows sda3 as a member of vg “centos” 7. lvdisplay shows 2 logical volumes, \/dev\/centos\/root and \/dev\/centos\/swap, 8. resize file system, since it’s using XFS on centos7, Here<\/a>‘s the reference<\/p>\n ——————————————————- — Physical volume — When it comes to a situation that the disk space is not enough on a virtual machine, it’s easy to extend the disk space if it’s on LVM, even the \/root partition. This post is very helpful. For my own … Continue reading
\nCase:
\nVM on VMware, installed with CentOS 6.x
\n#fdisk -l shows
\nDisk \/dev\/sda: 12GB ….
\n\/dev\/sda1 2 501 512000 83 Linux
\n\/dev\/sda2 502 12288 12069888 8e Linux LVM<\/p>\n
\nDisk \/dev\/mapper\/vg_node1-lv_root: 7.5 GB
\nDisk \/dev\/mapper\/vg_node1-lv_swap: 4 GB<\/p>\n
\n1. Using VMware GUI to add 8G to the virtual machine. Make sure it recognizes the new size. <\/p>\n
\n \/dev\/sda2 502 12288 12069888 8e Linux LVM<\/p>\n
\n fdisk \/dev\/sda<\/strong>
\n Use command “d”, then “2” to delete \/dev\/sda2
\n Use “n” to create a new partition, partition number is “2”
\n Use “t” to change partition type to 8e as “Linux LVM”
\n Then “w” to save the change<\/p>\n
\n pvsize \/dev\/sda2<\/strong><\/p>\n
\n #vgdisplay<\/strong> (found the free PE = 2048 )
\n #lvextend \/dev\/mapper\/vg_node1-lv_root –extents +2048<\/strong><\/p>\n
\n #resize2fs \/dev\/mapper\/vg_node1-lv_root<\/strong><\/p>\n
\nAnother way to do it<\/p>\n
\necho “- – -” > \/sys\/class\/scsi_host\/host0\/scan<\/p>\n
\ncreate a new partition on \/dev\/sda
\nfrisk \/dev\/sda -> n -> p -> 3 -> it will show the right start\/end block number automatically, so just hit enter,
\n-> t -> 8e -> w<\/p>\n
\nHowever it warns the kernel won’t use the new table until reboot, so reboot for the 2nd time<\/p>\n
\npvcreate \/dev\/sda3<\/p>\n
\nvgextend centos \/dev\/sda3<\/p>\n
\n[root@mononoke ~]# pvscan
\n PV \/dev\/sda2 VG centos lvm2 [15.51 GiB \/ 0 free]
\n PV \/dev\/sda3 VG centos lvm2 [9.00 GiB \/ 0 free]
\n Total: 2 [24.50 GiB] \/ in use: 2 [24.50 GiB] \/ in no VG: 0 [0 ] <\/p>\n
\n lvextend \/dev\/centos\/root \/dev\/sda3<\/p>\n
\nxfs_growfs \/dev\/centos\/root<\/p>\n
\n To check how much free space left in a physical volume, do pvdisplay, then find value of “Free PE”<\/p>\n
\n PV Name \/dev\/sdb2
\n VG Name test_vg
\n PV Size 20.00 GiB \/ not usable 1.31 MiB
\n Allocatable yes
\n PE Size 4.00 MiB
\n Total PE 5120
\n Free PE<\/strong> 2620<\/strong>
\n Allocated PE 2500<\/p>\n","protected":false},"excerpt":{"rendered":"