Disk /dev/vda: 53.7 GB, 53687091200 bytes, 104857600 sectors Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos
Disk identifier: 0x00077acf
Device Boot Start End Blocks Id System /dev/vda1 * 2048 411647 204800 83 Linux /dev/vda2 411648 84297727 41943040 83 Linux
/dev/vda3 84297728 88492031 2097152 82 Linux swap / Solaris
/dev/vda4 88492032 104857599 8182784 5 Extended /dev/vda5 88494080 104857599 8181760 8e Linux LVM
Disk /dev/sda: 107.4 GB, 107374182400 bytes, 209715200 sectors Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos
Disk identifier: 0x96647275
Device Boot Start End Blocks Id System
/dev/sda1 2048 209715199 104856576 8e Linux LVM
Disk /dev/mapper/centosvar-var: 8376 MB, 8376025088 bytes, 16359424 sectors Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@localhost ~]# pvcreate /dev/sda1
Physical volume \[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree /dev/sda1 lvm2 --- 100.00g 100.00g /dev/vda5 centosvar lvm2 a-- 7.80g 0 [root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/vda2 40G 1.8G 36G 5% /
devtmpfs 488M 0 488M 0% /dev
tmpfs 497M 0 497M 0% /dev/shm tmpfs 497M 6.6M 490M 2% /run
tmpfs 497M 0 497M 0% /sys/fs/cgroup /dev/vda1 190M 99M 78M 56% /boot /dev/mapper/centosvar-var 7.8G 813M 7.0G 11% /var
tmpfs 100M 0 100M 0% /run/user/0 [root@localhost ~]# vgextend centosvar /dev/sda1 Volume group \[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree /dev/sda1 centosvar lvm2 a-- 100.00g 100.00g /dev/vda5 centosvar lvm2 a-- 7.80g 0 [root@localhost ~]# vgs
VG #PV #LV #SN Attr VSize VFree centosvar 2 1 0 wz--n- 107.80g 100.00g
[root@localhost ~]# lvextend -l +100%FREE /dev/centosvar/var
Size of logical volume centosvar/var changed from 7.80 GiB (1997 extents) to 107.80 GiB (27596 extents).
Logical volume var successfully resized.
###如果是xfs格式的磁盘需要使用xfs_growfs命令扩展，否则使用resize2fs 命令扩展###### [root@localhost ~]# xfs_info /dev/centosvar/var
meta-data=/dev/mapper/centosvar-var isize=256 agcount=4, agsize=511232 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0
data = bsize=4096 blocks=2044928, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 [root@localhost ~]# xfs_growfs /dev/centosvar/var
meta-data=/dev/mapper/centosvar-var isize=256 agcount=4, agsize=511232 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0
data = bsize=4096 blocks=2044928, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal bsize=4096 blocks=2560, version=2
= sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 2044928 to 28258304
[root@localhost ~]# df -h
Filesystem Size Used Avail Use% Mounted on /dev/vda2 40G 1.8G 36G 5% /
devtmpfs 488M 0 488M 0% /dev
tmpfs 497M 0 497M 0% /dev/shm tmpfs 497M 6.6M 490M 2% /run
tmpfs 497M 0 497M 0% /sys/fs/cgroup /dev/vda1 190M 99M 78M 56% /boot /dev/mapper/centosvar-var 108G 815M 107G 1% /var
tmpfs 100M 0 100M 0% /run/user/0 [root@localhost ~]#
KVM 中Windows虚拟机磁盘网卡优化virtio驱动
1：默认情况下安装好Windows虚拟机，采用普通的驱动，即硬盘和网卡都采用默认配置情况下，硬盘是 ide 模式，而网卡工作在模拟的rtl 8139 网卡下，速度为100M 全双工。采用 virtio 驱动后，网卡工作在 1000M 的模式下，硬盘工作是SCSI模式下。显然我想修改为virtio驱动！
2：开始我试着修改配置文件（配置文件见附件）！然后重启虚拟机，结果蓝屏！
我试着device='disk' 部分的bus=‘ide’修改为virtio，并删除了，然后重启，结果蓝屏！ 见附件
显然这样不行！
3：下载virtio.iso文件，我使用的
是 http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/bin/virtio-win-0.1-30.iso 这个iso文件支持几乎所有的windows系统。挂载后iso文件见附件！
4：在配置中，添加virtio硬盘、virtio网卡，加载virtio-win.iso（cdrom）。启动vm 见附件：
尤其要注意Device type要选中Virtio Disk