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标题: 使用"du"和"acfs util snapinfo"获取已使用空间的巨大区别 [打印本页]

作者: 刘泽宇 时间: 4 天前
标题: 使用"du"和"acfs util snapinfo"获取已使用空间的巨大区别
现象：
acfsutil snap info显示snapshot使用了1.69TB，而"du"报告使用了235GB。

[root@test ~]# df -h
Filesystem          Size  Used Avail Use% Mounted on
/dev/xvda2          55G 35G 18G  67% /
tmpfs                48G  1.2G 46G 3% /dev/shm
/dev/xvda1          452M 59M  371M  14% /boot
/dev/xvdb1          92G 51G 37G  59% /u01
/dev/asm/datastore-231
                  2.1T  2.0T 53G  98% /u02/app/datastore

root@test datastore]# acfsutil snap info /u02/app/datastore
snapshot name:             TEST1
snapshot location:          /u02/app/datastore/.ACFS/snaps/TEST1
RO snapshot or RW snapshot:  RW
parent name:                /u02/app/datastore
snapshot creation time:    Thu Jul 19 21:59:34 2018

snapshot name:             TEST2
snapshot location:          /u02/app/datastore/.ACFS/snaps/TEST2
RO snapshot or RW snapshot:  RW
parent name:                /u02/app/datastore
snapshot creation time:    Mon Jul 30 14:41:38 2018

snapshot name:             TEST3
snapshot location:          /u02/app/datastore/.ACFS/snaps/TEST3
RO snapshot or RW snapshot:  RW
parent name:                /u02/app/datastore
snapshot creation time:    Thu Jan  4 11:25:03 2018

snapshot name:             TEST4
snapshot location:          /u02/app/datastore/.ACFS/snaps/TEST4
RO snapshot or RW snapshot:  RW
parent name:                /u02/app/datastore
snapshot creation time:    Thu Feb  8 15:30:01 2018

snapshot name:             TEST5
snapshot location:          /u02/app/datastore/.ACFS/snaps/TEST5
RO snapshot or RW snapshot:  RW
parent name:                /u02/app/datastore
snapshot creation time:    Thu Jan  4 19:25:59 2018

number of snapshots:  5
snapshot space usage: 1866378080256  ( 1.69 TB )

[root@test ~]# cd /u02/app/datastore/.ACFS/snaps/
[root@test snaps]# du -h --max-depth=1
4.0K ./TEST1
1.8G ./TEST2
17G ./TEST3
194G ./TEST4
23G ./TEST5
235G .

原因：
问题和snapshot over-subscription相关，在以下bug中被修复.
Bug 26844019 ADD OVERSUBSCRIPTION AND 7448 COUNT HANDLING AND MESSAGES TO FSCK
Bug 26396215 FSCK CHANGES NEEDED TO IMPROVE PERFORMANCE ON MANY TB SIZED FILE SYSTEMS

解决方案：
这些bug被12.1.0.2.180116 ACFS PSU修复。

打完PSU补丁后，我们需要在acfs文件系统上运行fsck。
远程fsck参考文档：KB132797

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