Xen Dom0 下判断 DomU 的磁盘使用率
从 xentop 大致可知：CPU%、MEM%、网络、I/O...等但对于 DomU 磁盘的使用、如：
用了多少 inode、多少空间，还剩多少，是否快爆满、是否应该通知客户升级 Xen 硬盘
这些 xentop 就心有余而力不足啦
# xentop
这里使用 dumpe2fs 为您排除忧愁哦
虽然不是特别准确、但也不会太离谱了啦
# dumpe2fs -h /dev/xvda1
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name: /
Last mounted on: <not available>
Filesystem UUID: 218c169f-a405-4862-afe6-3913c81beb37
Filesystem magic number:0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 767232
Block count: 767095
Reserved block count: 38354
Free blocks: 439490
Free inodes: 716246
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 187
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 31968
Inode blocks per group: 999
Filesystem created: Tue Apr9 01:07:47 2013
Last mount time: Tue Apr9 09:44:18 2013
Last write time: Tue Apr9 09:44:18 2013
Mount count: 3
Maximum mount count: -1
Last checked: Tue Apr9 01:07:47 2013
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
First orphan inode: 171042
Default directory hash: tea
Directory Hash Seed: 839d1c07-6fc3-4794-9526-92d5ef94fa19
Journal backup: inode blocks
Journal size: 64M
从上面的：
Inode count, Block count, Free blocks, Free inodes, Block size
等就可以判断出硬盘的使用率情况
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