或者XenKVM联机主机缺盘空,需要放大硬盘,无法重启。此时,需要热添加来扩展磁盘空。
说明:Xen和KVM主机是CentOS6.4,来宾磁盘是lvm格式。
先说Xen。 *** 作是一样的,在虚拟机上测试。
Xen的访客主机扩展根分区:
# xm list #test2主机增大磁盘空间 Name ID Mem VCPUs State Time(s) Domain-0 0 1024 4 r----- 80.8 test2 1 768 4 -b---- 25.8 # qemu-img info test2.qcow2 #现在为10G的磁盘 p_w_picpath: test2.qcow2 file format: raw virtual size: 10G (10739318784 bytes) disk size: 1.5G # qemu-img create -f qcow2 -o size=5G,preallocation=metadata /data/testadd.qcow2 #新建一块5G的磁盘 Formatting '/data/testadd.qcow2', fmt=qcow2 size=5368709120 encryption=off cluster_size=65536 preallocation='metadata' #防止出错,把preallocation=metadata去掉,或者qemu-img create -f raw /data/testadd.img 5G # qemu-img info testadd.qcow2 #查看新建的磁盘 p_w_picpath: testadd.qcow2 file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 912K cluster_size: 65536 # virsh attach-disk test2 /data/testadd.qcow2 xvdb --cache=writeback --subdriver=qcow2 #对test2主机进行添加,xvdb Disk attached successfully # vim test2 #修改guest的配置文件,添加xvdb name = "test2" memory = "768" disk = [ "file:/data/test2.qcow2,xvda,w","file:/data/testadd.qcow2,xvdb,w" ] vif = [ "bridge=br0" ] vcpus = 4 on_reboot = "restart" on_crash = "destroy"下一步是进入guest虚拟机,并首先对其进行分区
Lvm磁盘分区
[root@localhost ~]# partx -a /dev/xvdb BLKPG: Device or resource busy error adding partition 1 [root@localhost ~]# kpartx /dev/xvdb xvdb1 : 0 10474317 /dev/xvdb 63 [root@localhost ~]# partx -a /dev/xvdb1 /dev/xvdb [root@localhost ~]# pvcreate /dev/xvdb1 Physical volume "/dev/xvdb1" successfully created [root@localhost ~]# vgs #现在为10G的磁盘 VG #PV #LV #SN Attr VSize VFree VolGroup 1 2 0 wz--n- 9.51g 0 [root@localhost ~]# vgextend VolGroup /dev/xvdb1 Volume group "VolGroup" successfully extended [root@localhost ~]# vgs #增大了5G的空间 VG #PV #LV #SN Attr VSize VFree VolGroup 2 2 0 wz--n- 14.50g 4.99g [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert lv_root VolGroup -wi-ao--- 8.54g lv_swap VolGroup -wi-ao--- 992.00m [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 8.5G 695M 7.3G 9% / tmpfs 371M 0 371M 0% /dev/shm /dev/xvda1 485M 32M 429M 7% /boot [root@localhost ~]# lvextend -l +100%FREE /dev/VolGroup/lv_root Extending logical volume lv_root to 13.53 GiB Logical volume lv_root successfully resized [root@localhost ~]# resize2fs /dev/VolGroup/lv_root resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/VolGroup/lv_root is mounted on /; on-line resizing required old desc_blocks = 1, new_desc_blocks = 1 Performing an on-line resize of /dev/VolGroup/lv_root to 3547136 (4k) blocks. The filesystem on /dev/VolGroup/lv_root is now 3547136 blocks long. [root@localhost ~]# df -h #磁盘增加好了 Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 14G 698M 12G 6% / tmpfs 371M 0 371M 0% /dev/shm /dev/xvda1 485M 32M 429M 7% /bootKVM的
来宾热扩展磁盘空
进入来宾主机,你会看到如下提示
# pci 0000:00:07.0: BAR 1: assigned [mem 0x30000000-0x30000fff] pci 0000:00:07.0: BAR 1: set to [mem 0x30000000-0x30000fff] (PCI address [0x30000000-0x30000fff] pci 0000:00:07.0: BAR 0: assigned [io 0x1000-0x103f] pci 0000:00:07.0: BAR 0: set to [io 0x1000-0x103f] (PCI address [0x1000-0x103f] pci 0000:00:00.0: no hotplug settings from platform pci 0000:00:00.0: using default PCI settings pci 0000:00:01.0: no hotplug settings from platform pci 0000:00:01.0: using default PCI settings ata_piix 0000:00:01.1: no hotplug settings from platform ata_piix 0000:00:01.1: using default PCI settings piix4_smbus 0000:00:01.3: no hotplug settings from platform piix4_smbus 0000:00:01.3: using default PCI settings virtio-pci 0000:00:03.0: no hotplug settings from platform virtio-pci 0000:00:03.0: using default PCI settings uhci_hcd 0000:00:04.0: no hotplug settings from platform uhci_hcd 0000:00:04.0: using default PCI settings uhci_hcd 0000:00:04.1: no hotplug settings from platform uhci_hcd 0000:00:04.1: using default PCI settings uhci_hcd 0000:00:04.2: no hotplug settings from platform uhci_hcd 0000:00:04.2: using default PCI settings ehci_hcd 0000:00:04.7: no hotplug settings from platform ehci_hcd 0000:00:04.7: using default PCI settings virtio-pci 0000:00:05.0: no hotplug settings from platform virtio-pci 0000:00:05.0: using default PCI settings virtio-pci 0000:00:06.0: no hotplug settings from platform virtio-pci 0000:00:06.0: using default PCI settings pci 0000:00:07.0: no hotplug settings from platform pci 0000:00:07.0: using default PCI settings virtio-pci 0000:00:07.0: enabling device (0000 -> 0003) virtio-pci 0000:00:07.0: PCI INT A -> Link[LNKC] -> GSI 11 (level, high) -> IRQ 11 vdb: unknown partition table展开磁盘
扩展磁盘有危险,请根据自己的环境和设置进行调整,先在测试机上 *** 作。
重启模式添加磁盘文件扩展磁盘空:
# qemu-img create -f qcow2 -o size=100G,preallocation=metadata /var/xen/centos3.qcow2 # qemu-img info centos3.qcow2 p_w_picpath: centos3.qcow2 file format: qcow2 virtual size: 100G (107374182400 bytes) disk size: 49G cluster_size: 65536 #已经是100G空间的guest主机,下面再增大100G空间 # qemu-img resize centos3.qcow2 +100G #增加100G空间 # qemu-img info centos3.qcow2 p_w_picpath: centos3.qcow2 file format: qcow2 virtual size: 200G (214748364800 bytes) disk size: 49G cluster_size: 65536 #img格式增大硬盘容量 dd if=/dev/zero bs=8k count=125000 >> /data/centos65.img 125000+0 records in 125000+0 records out 1024000000 bytes (1.0 GB) copied, 14.1461 s, 72.4 MB/s然后进入来宾主机,按照Xen主机扩展磁盘的方式添加。
您还可以进入来宾主机,对新添加的磁盘文件进行分区,创建新文件夹,并挂载它们。
# fdisk -l # fdisk /dev/xvdb # partx -a /dev/xvdb BLKPG: Device or resource busy error adding partition 1 # kpartx /dev/xvdb xvdb1 : 0 4294961622 /dev/xvdb 63 # partx -a /dev/xvdb1 /dev/xvdb # mkfs.ext4 /dev/xvdb1 # mkdir /data # vim /etc/fstab /dev/xvdb1 /data ext4 defaults 0 0 # mount -a # df -h另外,qcow2文件只能增不能减,lvm磁盘格式没有ext
快
增加磁盘容量的方法很灵活,要谨慎[/s2/]
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