How to add a hard disk to a Linux virtual machine in KVM

[[email protected] ~]# df-htfilesystem Type Size used Avail use% mounted On/dev/mapper/volgroup-lv_root            Ext4 8.3G 937M 7.0G 12%/tmpfs tmpfs 119M 0 119M 0%/dev/shm/dev/vda1 Ext4 477M 33M 419M 8%/boot[[email protected] ~]# generate a new hard drive [[email protected] virhost]# qemu-img C Reate-f Raw O5cache.add.disk.raw 2GFormatting ' 05cache.add.disk.raw ', Fmt=raw size=2147483648 <disk type= ' file ' Devi Ce= ' disk ' > <driver name= ' qemu ' type= ' raw ' cache= ' None '/> <source file= '/home/virhost/05cache.add.dis  K.raw '/> <target dev= ' vda ' bus= ' virtio '/> <address type= ' pci ' domain= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x07 ' function= ' 0x0 '/> </disk>[[email protected] virhost]# virsh start 05cacheDomain 05cache started[[email&n Bsp;protected] virhost]# virsh attach-disk 05cache/home/virhost/05cache.add.disk.raw vdb--cache NoneDisk attached Successfullyvirsh Edit 05cache----------------><disk type= ' file ' device= ' disk ' > <driver name= ' qemu ' type= ' raw ' cache= ' None '/> &lt ; source file= '/home/virhost/05cache.img '/> <target dev= ' vda ' bus= ' virtio '/> <address type= ' PCI ' DOMA in= ' 0x0000 ' bus= ' 0x00 ' slot= ' 0x05 ' function= ' 0x0 '/> </disk> <disk type= ' block ' device= ' cdrom ' > & Lt;driver name= ' qemu ' type= ' raw '/> <target dev= ' hdc ' bus= ' IDE '/> <readonly/> <address typ E= ' drive ' controller= ' 0 ' bus= ' 1 ' target= ' 0 ' unit= ' 0 '/> </disk>[[email protected] ~]# FDISK-LDISK/DEV/VD a:10.7 GB, 10737418240 bytes16 heads, $ sectors/track, 20805 cylindersunits = cylinders of 1008 * = 516096 Bytessect or size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk identifier:0x000c1 Fb8 Device Boot Start End Blocks Id system/dev/vda1 * 3 1018 512000 L Inuxpartition 1 does not End on cylinder boundary./dev/vda2 1018 20806 9972736 8e Linux lvmpartition 2 does no end on Cyl Inder boundary.  disk/dev/vdb:2147 MB, 2147483648 bytes #挂上的新的硬盘16 heads, sectors/track, 4161 cylindersunits = cylinders of 1008 * 512 = 516096 bytessector Size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk identifier:0x00000000disk/dev/mapper/volgroup-lv_root:9168 MB, 9168748544 bytes255 heads, sectors/track, 1114 Cylin Dersunits = Cylinders of 16065 * 8225280 bytessector size (logical/physical): bytes/512 bytesi/o Size (minimum  /optimal): bytes/512 bytesdisk identifier:0x00000000disk/dev/mapper/volgroup-lv_swap:1040 MB, 1040187392 bytes255  Heads, Sectors/track, 126 cylindersunits = cylinders of 16065 * = 8225280 bytessector size (logical/physical): 512 bytes/512 bytesi/o Size (minimum/optimal): bytes/512 bytesdisk identifier:0x00000000

To format a hard disk in a virtual machine

[Email protected] ~]# mkfs.ext4/dev/vdbmke2fs 1.41.12 (17-may-2010) Filesystem label=os type:linuxblock size=4096 (log= 2) Fragment size=4096 (log=2) stride=0 blocks, Stripe width=0 blocks131072 inodes, 524288 blocks26214 blocks (5.00%) reserve D for the Super Userfirst data block=0maximum filesystem blocks=53687091216 block groups32768 blocks per group, 32768 Frag  ments per group8192 inodes per groupsuperblock backups stored on blocks:32768, 98304, 163840, 229376, 294912Writing inode  Tables:done                            Creating Journal (16384 blocks): donewriting superblocks and filesystem accounting information:donethis FileSystem'll is automatically checked every mounts or180 days, whichever comes first.  Use Tune2fs-c or-i to override.

Next, build a directory to mount the new hard disk:

[[email protected] ~]# mkdir/nd[[email protected] ~]# mkdir/nd[[email protected] ~]# mount/dev/vdb/nd/# get the Uuid[[emai of the hard drive L protected] ~]# Blkid/dev/vdb
/dev/vdb:uuid= "A35e0890-3aa6-47a7-921c-c2cb9dd431e6" type= "Ext4"

To add a mount to the boot boot:

[[email protected] ~]# Cat/etc/fstab # #/etc/fstab# Created by Anaconda on Tue June to 08:57:38 2016## Accessible filesyst EMS, by reference, is maintained under '/dev/disk ' # See mans Pages Fstab (5), Findfs (8), mount (8) and/or Blkid (8) For more Info#/dev/mapper/volgroup-lv_root/                       ext4    defaults        1 1uuid=04e8e77f-2604-4683-833b-a06a7300c7a3/boot                   ext4    defaults        1 2/dev/mapper/volgroup-lv_swap swap                    swap    defaults        0 0TMPFS                   /dev/shm                tmpfs   defaults        0 0devpts                  /dev/pts                devpts  gid=5,mode=620  0 0sysfs                   /sys                    Sysfs   defaults        0 0proc                    /proc                   proc    defaults        0 0uuid= A35e0890-3aa6-47a7-921c-c2cb9dd431e6/nd  ext4     Defaults        

[Email protected] ~]# df-hfilesystem            Size  used Avail use% mounted on/dev/mapper/volgroup-lv_root                      8.3G  644M  7.3G   9%/tmpfs                 119M     0  119M   0%/dev/shm/dev/vda1             477M   33M  419M   8%/boot/dev/vdb              2.0G  3.0M  1.9G   1%/nd

How to add a hard disk to a Linux virtual machine in KVM