Add disks to KVM virtual machines

Background:

Due to the glusterfs test on the KVM Vm, it is found that the KVM virtual storage space is insufficient.

Idea: Create a kvm img file with a size of 200 GB and import it to the corresponding virtual machine through virtual machine manager.

Steps:

The following uses virtual machine VM2 as an example.

1. Create KVM img

   [[Email protected] 2] cd/D1/virtual_machine/Vm/2 # enter the VM file directory

   [[E-mail protected] 2] # qemu-IMG create vm2-1.img 200g
   

   Formatting 'vm2-1. IMG ', FMT = raw size = 214748364800 # Created successfully

   [[Email protected] 2] # ls

   Vm2-1.img (vm2.img)

2. Use vmm to import files

   Disable VM2 first

   650) This. width = 650; "src =" http://s3.51cto.com/wyfs02/M02/36/F8/wKiom1Or30WzbU5YAANYj1ubhWY599.jpg "Title =" 11.jpg" alt = "wkiom1or30wzbu5yaanyj1ubhwy599.jpg"/> Click Finish to add the disk

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   IDE disk2 is the new disk.

   Start VM2

3. New disk formatting Partition

   [[Email protected] ~] # Fdisk-L # view system Disks

   
   

   Disk/dev/SDB: 214.7 GB, 214748364800 bytes --- New Disk

   255 heads, 63 sectors/track, 26108 Cylinders

   Units = cylinders of 16065*512 = 8225280 bytes

   Sector size (logical/physical): 512 bytes/512 bytes

   I/O size (minimum/optimal): 512 bytes/512 bytes

   Disk identifier: 0x00000000

   ....

    

   [[Email protected] ~] # Fdisk/dev/SDB # Add Disk Partitions

   Device contains neither a valid DOS partition table, Nor Sun, SGI or OSF disklabel

   Building a new dos disklabel with disk identifier 0xc6997a54.

   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 stronugly recommended

   Switch off the mode (command 'C') and change display units

   Sectors (command 'U ').

   
   

   Command (M for help): p # print the current disk Information

   
   

   Disk/dev/SDB: 214.7 GB, 214748364800 bytes

   255 heads, 63 sectors/track, 26108 Cylinders

   Units = cylinders of 16065*512 = 8225280 bytes

   Sector size (logical/physical): 512 bytes/512 bytes

   I/O size (minimum/optimal): 512 bytes/512 bytes

   Disk identifier: 0xc6997a54

   
   

   Device boot start end blocks ID system

   
   

   
   

   Command (M for help): N # Add a partition

   Command action

   E extended

   P primary partition (1-4)

   P # usually select the primary partition, so here is a p

   Partition Number (1-4): 1 # select 1 because it is the first score.

   First cylinder (1-26108, default 1): 26100G # Fill in the partition size 200g

   Last cylinder, + cylinders or + size {K, M, g} (26100-26108, default 26108 ):

   Using default value 26108

   
   

   Command (M for help): W # Write the partition to the hard disk

   The partition table has been altered!

   
   

   Calling IOCTL () to re-read partition table.

   Syncing disks.

   
   

4. Format partitions

   
   

   [[Email protected] ~] # Mkfs. ext4/dev/SDB

   Mke2fs 1.41.12 (17-may-2010)

   /Dev/SDB is entire device, not just one partition!

   Proceed anyway? (Y, n) y

   Filesystem label =

   OS type: Linux

   Block size = 4096 (log = 2)

   Fragment size = 4096 (log = 2)

   Stride = 0 blocks, stripe width = 0 blocks

   13107200 inodes, 52428800 Blocks

   2621440 blocks (5.00%) reserved for the Super User

   First data block = 0

   Maximum filesystem blocks = 4294967296

   1600 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 34 mounts or

   180 days, whichever comes first. Use tune2fs-C or-I to override.

5. Create a directory Mount Partition

   Mkdir/d1

   
   

   [[Email protected] ~] # Mount/dev/sdb/d1

   [[Email protected] ~] # DF-H

   Filesystem size used avail use % mounted on

   /Dev/mapper/vg_livedvd-lv_root

   20 GB 5.2g 15g 27%/

   Tmpfs 3.9g 0 3.9g 0%/dev/SHM

   /Dev/sda1 485 m 37 m 423 M 8%/boot

   /Dev/SDB 197g 188 m 187g 1%/d1

Finished

Supplement:

Automatically mount/dev/SDB upon startup

/Etc/fstab adds the following content:

/Dev/sdb/d1 ext4 defaults 1 1

Restart the system