服务器用了几年，并且文件操作比较频繁，还是会出现碎片的，应该整理。注意：在Debian中XFS相关命令在xfsprogs包中，而xfs_fsr命令是在xfsdump包中的。所以要用xfs_fsr整理碎片，记得安装xfsdump包。

一、查看碎片

1、查看/dev/centos/home的碎片情况：

#这个应该整理一下碎片了
[root@st-dev4 ~]# xfs_db -c frag -r /dev/centos/home 
actual 266367, ideal 108763, fragmentation factor 59.17%
Note, this number is largely meaningless.
Files on this filesystem average 2.45 extents per file

2、查看/dev/sdb1的碎片情况：

#这个不用做碎片整理。  
xfs_db -c frag -r /dev/sdb1
actual 905607, ideal 900507, fragmentation factor 0.56% 

二、整理碎片

[root@st-dev4 ~]# xfs_fsr -v /dev/centos/home
/home start inode=0
ino=312605443
No improvement will be made (skipping): ino=312605443
ino=312605491
No improvement will be made (skipping): ino=312605491
ino=312605453
No improvement will be made (skipping): ino=312605453
ino=312906354
No improvement will be made (skipping): ino=312906354
ino=313953957
No improvement will be made (skipping): ino=313953957
ino=805577833
ino=805577833: file modified defrag aborted
ino=807923574
ino=807923574: file modified defrag aborted
ino=1078594289
ino=1078594289: file busy
ino=1078594290
extents before:3 after:2 DONE ino=1078594290
ino=1095801468
extents before:2843 after:1 DONE ino=1095801468
ino=1095969493
extents before:2 after:1 DONE ino=1095969493
ino=1343427175
extents before:3 after:2      ino=1343427175
ino=1344700610
ino=1344700610 already fully defragmented.
ino=1345133285
extents before:666 after:1 DONE ino=1345133285
ino=1345887553
ino=1345887553 already fully defragmented.
ino=1610729587
extents before:3 after:1 DONE ino=1610729587
ino=1611023216
ino=1611023216 already fully defragmented.
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