Use gdisk to adjust the size of the gpt/ext4 partition and gdiskgptext4 Partition

Use gdisk to adjust the size of the gpt/ext4 partition and gdiskgptext4 Partition

Host: CentOS release 6.4 (Final)

Purpose: GB from the/home partition to create a new partition/vm

Reference:

Http://ryanclouser.com /? P = 66

Http://falstaff.agner.ch/2013/12/22/online-resize-root-filesystem-on-a-gpt-partition/

Http://blog.zepsikopat.net/2011/07/22/resize-an-ext4-partition-on-a-gpt-disk/

Http://superuser.com/questions/660309/live-resize-of-a-gpt-partition-on-linux

1.View Current partition information

[Root @ tanghuimin/] # df-Th Filesystem Type Size Used Avail Use % Mounted on /Dev/sda3 ext4 9.7G 6.6G 2.6G 72%/ Tmpfs 1.8G 280 K 1.8G 1%/dev/shm /Dev/sda1 ext4 426G 37G 368G 10%/home /Dev/sda2 ext4 20G 4.2G 15G 23%/opt

/Home partition in/dev/sda1.

2. gdisk/dev/sda

? : Print command usage in gdisk

P: View partition tables

B: Back up the partition table so that the partition table can be restored due to subsequent operation errors.

[Root @ tanghuimin ~] # Gdisk/dev/sda GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? For help ):? Bback up GPT data to a file Cchange a partition's name Ddelete a partition Ishow detailed information on a partition Llist known partition types Nadd a new partition Ocreate a new empty GUID partition table (GPT) Pprint the partition table Qquit without saving changes Rrecovery and transformation options (experts only) Ssort partitions Tchange a partition's type code Vverify disk Wwrite table to disk and exit Xextra functionality (experts only) ? Print this menu Command (? For help): p Disk/dev/sda: 976773168 sectors, 465.8 GiB Logical sector size: 512 bytes Disk identifier (GUID): FB42D8BC-9B54-4B3B-A16C-A39A39B902FF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 976773134 Partitions will be aligned on 2048-sector boundaries Total free space is 2029 sectors (1014.5 KiB) Number Start (sector) End (sector) Size Code Name 1 2048 907141119 432.6 GiB 0700 2 907141120 948101119 19.5 GiB 0700 3 948101120 968581119 9.8 GiB EF00 4 968581120 976773119 3.9 GiB 8200 Command (? For help): B Enter backup filename to save:/root/gpt. sda. bak The operation has completed successfully.

3.Unmount the Shard to be adjusted/Home

[Root @ tanghuimin ~] # Umount/home/ [Root @ tanghuimin ~] # Df-Th Filesystem Type Size Used Avail Use % Mounted on /Dev/sda3 ext4 9.7G 6.6G 2.6G 72%/ Tmpfs 1.8G 296 K 1.8G 1%/dev/shm /Dev/sda2 ext4 20G 4.2G 15G 23%/opt

4.Detect file system errors

[Root @ tanghuimin ~] # E2fsck-f/dev/sda1 E2fsck 1.41.12 (17-May-2010) 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 /Dev/sda1: 268432/28352512 files (0.1% non-contiguous), 11359488/113392384 blocks

5.UseResize2fsResize a File System

[Root @ tanghuimin ~] # Resize2fs/dev/sda1 326G Resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on/dev/sda1 to 85458944 (4 k) blocks. The filesystem on/dev/sda1 is now 85458944 blocks long.

6.UseGdiskAdjust the partition size. UseDDelete a partition and then useNCreate a partition

[Root @ tanghuimin ~] # Gdisk/dev/sda GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? For help): p Disk/dev/sda: 976773168 sectors, 465.8 GiB Logical sector size: 512 bytes Disk identifier (GUID): FB42D8BC-9B54-4B3B-A16C-A39A39B902FF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 976773134 Partitions will be aligned on 2048-sector boundaries Total free space is 2029 sectors (1014.5 KiB) Number Start (sector) End (sector) Size Code Name 1 2048 907141119 432.6 GiB 0700 2 907141120 948101119 19.5 GiB 0700 3 948101120 968581119 9.8 GiB EF00 4 968581120 976773119 3.9 GiB 8200 Command (? For help): d Partition number (1-4): 1 Command (? For help): p Disk/dev/sda: 976773168 sectors, 465.8 GiB Logical sector size: 512 bytes Disk identifier (GUID): FB42D8BC-9B54-4B3B-A16C-A39A39B902FF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 976773134 Partitions will be aligned on 2048-sector boundaries Total free space is 907141101 sectors (432.6 GiB) Number Start (sector) End (sector) Size Code Name 2 907141120 948101119 19.5 GiB 0700 3 948101120 968581119 9.8 GiB EF00 4 968581120 976773119 3.9 GiB 8200 Command (? For help): n Partition number (1-128, default 1 ): First sector (34-976773134, default = 2048) or {+-} size {KMGTP }: Last sector (2048-907141119, default = 907141119) or {+-} size {KMGTP}: 326G Current type is 'linux filesystem' Hex code or GUID (L to show codes, Enter = 8300 ): Changed type of partition to 'linux filesystem' Command (? For help): w Final checks complete. About to write GPT data. THIS WILLOVERWRITE EXISTING PARTITIONS !! Do you want to proceed? (Y/N): y OK; writing new GUID partition table (GPT) to/dev/sda. Warning: The kernel is still using the old partition table. The new table will be used at the next reboot. The operation has completed successfully.

The partition size has been adjusted.

7.Set/Dev/sda1Mount/Home

[Root @ tanghuimin ~] # Df-Th Filesystem Type Size Used Avail Use % Mounted on /Dev/sda3 ext4 9.7G 6.6G 2.6G 72%/ Tmpfs 1.8G 296 K 1.8G 1%/dev/shm /Dev/sda2 ext4 20G 4.2G 15G 23%/opt [Root @ tanghuimin ~] # Mount/dev/sda1/home/ [Root @ tanghuimin ~] # Df-Th Filesystem Type Size Used Avail Use % Mounted on /Dev/sda3 ext4 9.7G 6.6G 2.6G 72%/ Tmpfs 1.8G 296 K 1.8G 1%/dev/shm /Dev/sda2 ext4 20G 4.2G 15G 23%/opt /Dev/sda1 ext4 321G 37G 269G 12%/home

Reboot.

8.In/Dev/sdaAllFreeTo create a new partition.

[Root @ tanghuimin ~] # Gdisk/dev/sda GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? For help): p Disk/dev/sda: 976773168 sectors, 465.8 GiB Logical sector size: 512 bytes Disk identifier (GUID): FB42D8BC-9B54-4B3B-A16C-A39A39B902FF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 976773134 Partitions will be aligned on 2048-sector boundaries Total free space is 221374444 sectors (105.6 GiB) Number Start (sector) End (sector) Size Code Name 1 2048 685768704 327.0 GiB 8300 Linuxfilesystem 2 907141120 948101119 19.5 GiB 0700 3 948101120 968581119 9.8 GiB EF00 4 968581120 976773119 3.9 GiB 8200 Command (? For help): n Partition number (5-128, default 5 ): First sector (34-976773134, default = 685770752) or {+-} size {KMGTP }: Last sector (685770752-907141119, default = 907141119) or {+-} size {KMGTP }: Current type is 'linux filesystem' Hex code or GUID (L to show codes, Enter = 8300 ): Changed type of partition to 'linux filesystem' Command (? For help): w Final checks complete. About to write GPT data. THIS WILLOVERWRITE EXISTING PARTITIONS !! Do you want to proceed? (Y/N): y OK; writing new GUID partition table (GPT) to/dev/sda. Warning: The kernel is still using the old partition table. The new table will be used at the next reboot. The operation has completed successfully.

9.Set the file system type of the new partitionExt4

[Root @ tanghuimin ~] # Mkfs-t ext4/dev/sda5 Mke2fs 1.41.12 (17-May-2010) Filesystem label = OS type: Linux Block size = 4096 (log = 2) Fragment size = 4096 (log = 2) Stride = 1 blocks, Stripe width = 0 blocks 6922240 inodes, 27671296 blocks 1383564 blocks (5.00%) reserved for the super user First data block = 0 Maximum filesystem blocks = 4294967296 845 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768,983 04, 163840,229 376, 294912,819 200, 884736,160 5632,2654208, 4096000,796 2624, 11239424,204 23887872 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 33 mountsor 180 days, whichever comes first. Use tune2fs-c or-I tooverride.

10.Add new partition/Dev/sda5Mount/Vm

[Root @ tanghuimin ~] # Mount/dev/sda5/vm [Root @ tanghuimin ~] # Df-Th Filesystem Type Size Used Avail Use % Mounted on /Dev/sda3 ext4 9.7G 6.6G 2.6G 72%/ Tmpfs 1.8G 224 K 1.8G 1%/dev/shm /Dev/sda1 ext4 321G 37G 269G 12%/home /Dev/sda2 ext4 20G 4.2G 15G 23%/opt /Dev/sda5 ext4 104G 188 M 99G 1%/vm

11.In/Etc/fstabTo enable/Dev/sda5Mounted/Vm

/Dev/sda5/vmext4defaults12

Reboot.