[ASK] decrease/shrink the size of filesystem Post: 303032956

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Operating Systems AIX [ASK] decrease/shrink the size of filesystem Post 303032956 by bakunin on Wednesday 27th of March 2019 08:34:18 AM

03-27-2019

Registered User

Quote:

Originally Posted by Phat

I would like to reduce the size of filesystem online. We can do online for increase without any problem. So any risk can be occurred with the decrease?<...>
My AIX system is version 6.1 and the filesystem type is JFS2.

You can do that without risk online. I suggest you do it when the load is light (because for the time it takes performance is decreased) but in principle you can do it at any time without interrupting the service.

Notice that a "filesystem" (FS) resides on a "logical volume" (LV) and the LV is decreased in size as well as the FS is decreased. Because LVs are built from "logical partitions" (LPs) and these in turn are built from allocated "physical partitions" you can only decrease (as well as increase) a filesystem in units of the PP size. You also need to have at least one LP free (after shrinking the FS). i.e if you have a PP size of 1024MB and you have 2GB free in the FS you can shrink it by 1GB but not by 2GB.

You should run a defragfs before so you do not have to worry about moving data. , This is (or, maybe, was - but i still do it that way) not done by the chfs command automatically. You just need to make sure you can afford (see above) to release the space. You do not have to worry about (LVM-level) striping, mirroring, etc.. If you have i.e. a mirror set up the LVM will release the two corresponding PPs for the LP to be freed automatically.

Finally, here is how you do it:

Code:

chfs -a size=-1 /path/to/fs

will reduce the FS by 1 byte but because (see above) it can only shrink in units it will be shrunk by the size of 1 PP. You can also set a certain target amount:

Code:

chfs -a size=100G /path/to/fs

will - depending on the current size - shrink or expand the FS to a final 100GB.

I hope this helps.

bakunin

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resize2fs

RESIZE2FS(8)						      System Manager's Manual						      RESIZE2FS(8)

NAME

       resize2fs - ext2 file system resizer

SYNOPSIS

       resize2fs [ -d debug-flags ] [ -f ] [ -F ] [ -p ] device [ size ]

DESCRIPTION

       The  resize2fs program will resize ext2 file systems.  It can be used to enlarge or shrink an ext2 file system located on device so that it
       will have size blocks.  If the size parameter is not specified, it will default to the size of the partition.  The size parameter may never
       be larger than the size of the partition.

       The  resize2fs  program	does not manipulate the size of partitions.  If you wish to enlarge a filesystem, you must first make sure you can
       expand the size of the underlying partition first.  This can be done using fdisk(8) by deleting the partition  and  recreating  it  with  a
       larger size.  When recreating the partition, make sure you create it with the same starting disk cylinder as before!  Otherwise, the resize
       operation will certainly not work, and you may lose your entire filesystem.

       If you wish to shrink an ext2 partition, first use resize2fs to shrink the size of filesystem.  Then you may use  fdisk(8)  to  shrink  the
       size  of  the  partition.   When  shrinking  the  size of the partition, make sure you do not make it smaller than the new size of the ext2
       filesystem!

OPTIONS

       -d debug-flags
	      Turns on various resize2fs debugging features, if they have been compiled into the binary.  debug-flags should be computed by adding
	      the numbers of the desired features from the following list:
		   1	- Print out all disk I/O
		   2	- Debug block relocations
		   8	- Debug inode relocations
		   16	- Debug moving the inode table

       -p     Prints out a percentage completion bars for each resize2fs operation, so that the user can keep track of what the program is doing.

       -f     Forces resize2fs to proceed with the filesystem resize operation, overriding some safety checks which resize2fs normally enforces.

       -F     Flush the filesystem device's buffer caches before beginning.  Only really useful for doing resize2fs time trials.

AUTHOR

       resize2fs was written by Theodore Ts'o <tytso@mit.edu>.

COPYRIGHT

       Resize2fs  is  Copyright 1998 by Theodore Ts'o and PowerQuest, Inc.  All rights reserved.  As of April, 2000 Resize2fs may be redistributed
       under the terms of the GPL.

SEE ALSO

       fdisk(8), e2fsck(8), mke2fs(8)

E2fsprogs version 1.32						   November 2002						      RESIZE2FS(8)

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