ACFS snapshot size

Today I had to know how to find ACFS snapshot size individually. Unfortunately it seems there are no comfortable way to know it. But I found some indirect way.

  • You can use “du” tool

du -lhs /local/.ACFS/snaps/*
8,4G /local/.ACFS/snaps/2E51DA81AB9E4609E05321948C253C38
17G /local/.ACFS/snaps/2F1D951E0D934052E05321948C2587CF
77G /local/.ACFS/snaps/2F1D951E0D964052E05321948C2587CF
97G /local/.ACFS/snaps/2F1D951E0D974052E05321948C2587CF
117G /local/.ACFS/snaps/2F1D951E0D984052E05321948C2587CF
137G /local/.ACFS/snaps/2F1D951E0D994052E05321948C2587CF
157G /local/.ACFS/snaps/2F1D951E0D9A4052E05321948C2587CF
17G /local/.ACFS/snaps/321C75093C79394DE05321948C259F9C
17G /local/.ACFS/snaps/321C75093C7A394DE05321948C259F9C
17G /local/.ACFS/snaps/321C75093C7B394DE05321948C259F9C
17G /local/.ACFS/snaps/321D040845EB1AA6E05321948C253F96
17G /local/.ACFS/snaps/321D040845EC1AA6E05321948C253F96
17G /local/.ACFS/snaps/321D040845ED1AA6E05321948C253F96
17G /local/.ACFS/snaps/321D040845EE1AA6E05321948C253F96
17G /local/.ACFS/snaps/321D040845EF1AA6E05321948C253F96
405G /local/.ACFS/snaps/32452DC651615E85E05321948C25098B

Repeatable size tell us that nothing has changed, or changed not significant related by size. Use “–exclude” if you need that.

The snapshot “2F1D951E0D9A4052E05321948C2587CF” increased.

  • Use “acfsutil info file” for each snapshot to confirm that the offset was changed.

/sbin/acfsutil info file -d /local/.ACFS/snaps/2E51DA81AB9E4609E05321948C253C38
/local/.ACFS/snaps/2E51DA81AB9E4609E05321948C253C38
flags: Directory
inode: 288230376151711746
owner: oracle
group: oinstall
size: 4096 ( 4.00 KB )
allocated: 4096 ( 4.00 KB )
hardlinks: 6
device index: 1
major, minor: 251,185345
access time: Fri Mar 18 12:30:50 2016
modify time: Fri Mar 18 14:19:16 2016
change time: Fri Mar 18 14:19:16 2016
extents:
-offset ----length | -dev --------offset
0 4096 | 1 86016
----current offset | -cur vol offset -mir --extent -device name --------doffset --length -ASMdev
0 | 86016 0 1 ORCL:DISK132 16863232 4096 68
0 | 86016 1 1 ORCL:DISK205 16863232 4096 4
-------------------------------------------------------------------------------------------------


/sbin/acfsutil info file -d /local/.ACFS/snaps/2F1D951E0D9A4052E05321948C2587CF
/local/.ACFS/snaps/2F1D951E0D9A4052E05321948C2587CF
flags: Directory
inode: 2594073385365405698
owner: oracle
group: oinstall
size: 4096 ( 4.00 KB )
allocated: 4096 ( 4.00 KB )
hardlinks: 17
device index: 1
major, minor: 251,185345
access time: Fri Mar 18 12:30:50 2016
modify time: Mon Mar 28 18:20:54 2016
change time: Mon Mar 28 18:20:54 2016
extents:
-offset ----length | -dev --------offset
0 4096 | 1 32382976
----current offset | -cur vol offset -mir --extent -device name --------doffset --length -ASMdev
0 | 32382976 0 13 ORCL:DISK201 20848640 4096 0
0 | 32382976 1 13 ORCL:DISK133 1306001285120 4096 69
-------------------------------------------------------------------------------------------------

The offset has changed.

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