Extend a Filesystem with other LV Post: 302142202

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Operating Systems AIX Extend a Filesystem with other LV Post 302142202 by bakunin on Thursday 25th of October 2007 03:43:35 AM

10-25-2007

Registered User

@porter: c'mon! This is not an answer, this is a zero-message. He asks if it is possible and you tell him to use SMIT?? SMIT is a frontend, nothing more, if it is possible, it is possible regardless of using SMIT or not and if it isn't it will be impossible, again reagardless of using SMIT or not.

This is not the first time i see you giving such non-answers. Are you posthunting?

@Threadstarter: no, that is not possible. LVs (Logical Volumes) belong to a certain VG (Volume Group). A VG is a logical construct which combines several PVs (Physical Volumes: pyhsical disks, RAID volumes, SAN-shares, etc.) to one manageable entity. The disks are split into (more or less anonymized) parts (the "Physical Partition", PP) and given to a pool which can be assigned to the LVs in the VG. Most of the times LVs contain (exactly one) FS, but LVs could also host a swapspace, a boot partition, and some other things (you could even decide to use it as a raw device although this makes no sense any more nowadays), but save for these you could use "LV" and "FS" interchangeably - most of your logical volumes contain a filesystem.

Usually VGs are used for a group of LVs which are somehow logically connected. For instance, if you have several database instances on one machine it might be a good idea to create a VG for every instance. In every of these VGs you would have one FS (LV) for the binaries, one for the logs, one for the tablespaces, etc.

So the only reason why you would want to transfer a filesystem from one VG to another would be space considerations. In this case it is better to:

add more PPs to the LV if there are enough left in the pool (use lsvg <VGName> to check). dont forget to expand the filesystem after resizing the LV, it is not done automatically. Do the following:

get the PP size to find out how many PPs you will have to add to expand the LV for a certain size. (lsvg <VGName>) Get the name of the LV as you have perhaps only the mountpoint of the corresponding filesystem (lsvg -l <VGName>). Now calculate how much this is in 512-byte-blocks. Use chfs to expand the filesystem accordingly (chfs -a size=+<NrOfBlocks> <mountpoint>). You can do that without umounting the FS, your application using the FS won't even notice it.

For example: The PP size is 128MB and you want to add 2GB to the LV mytestlv mounted on /my/testlv. You will have to add 16 PPs. (I won't explain possible considerations about mirroring here.) Issue

extendlv mytestlv 16

Now calculate how much this is in 512-byte-blocks: 2*1024*1024*2=4194304

chfs -a size=+4194304 /my/testlv

If this is not possible because the pool of free PPs is exhausted add a new physical volume to the colume group (up to a maximum of 32)

If this is still not possible it is better to reorganize the volumegroup as a whole, using a bigger PP size (since PVs are limited to 1019 PPs the PP size determines the maximum size of the PVs used), use different storage, etc. and recreate all the LVs on the VG.

Oh, besides: you could do all that with SMIT too if you like.

bakunin

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sys::filesystem::aix

Sys::Filesystem::Aix(3pm)				User Contributed Perl Documentation				 Sys::Filesystem::Aix(3pm)

NAME

       Sys::Filesystem::Aix - Return AIX filesystem information to Sys::Filesystem

SYNOPSIS

       See Sys::Filesystem.

INHERITANCE

	 Sys::Filesystem::Aix
	 ISA UNIVERSAL

METHODS

       version ()
	   Return the version of the (sub)module.

ATTRIBUTES

       The following is a list of filesystem properties which may be queried as methods through the parent Sys::Filesystem object.

       account
	   Used by the dodisk command to determine the filesystems to be processed by the accounting system.

       boot
	   Used by the mkfs command to initialize the boot block of a new filesystem.

       check
	   Used by the fsck command to determine the default filesystems to be checked.

       dev Identifies, for local mounts, either the block special file where the filesystem resides or the file or directory to be mounted.

       free
	   This value can be either true or false. (Obsolete and ignored).

       mount
	   Used by the mount command to determine whether this file system should be mounted by default.

       nodename
	   Used by the mount command to determine which node contains the remote filesystem.

       size
	   Used by the mkfs command for reference and to build the file system.

       type
	   Used to group related mounts.

       vfs Specifies the type of mount. For example, vfs=nfs specifies the virtual filesystem being mounted is an NFS filesystem.

       vol Used by the mkfs command when initializing the label on a new filesystem. The value is a volume or pack label using a maximum of 6
	   characters.

       log The LVName must be the full path name of the filesystem logging logical volume name to which log data is written as this file system is
	   modified. This is only valid for journaled filesystems.

SEE ALSO

       Sys::Filesystem

   Example /etc/filesystems
	       * @(#)filesystems @(#)29        1.22  src/bos/etc/filesystems/filesystems, cmdfs, bos530 9/8/00 13:57:45
	       * IBM_PROLOG_BEGIN_TAG
	       * This is an automatically generated prolog.
	       *
	       * <snip>
	       *
	       * This version of /etc/filesystems assumes that only the root file system
	       * is created and ready.	As new file systems are added, change the check,
	       * mount, free, log, vol and vfs entries for the appropriate stanza.

	       /:
		       dev	 = /dev/hd4
		       vol	 = "root"
		       mount	 = automatic
		       check	 = false
		       free	 = true
		       vfs	 = jfs2
		       log	 = /dev/hd8
		       type	 = bootfs

	       /proc:
		       dev	 = /proc
		       vol	 = "/proc"
		       mount	 = true
		       check	 = false
		       free	 = false
		       vfs	 = procfs

	       /scratch:
		       dev	 = /dev/fslv02
		       vfs	 = jfs2
		       log	 = INLINE
		       mount	 = true
		       account	 = false

   Example /usr/sbin/mount output
		 node	    mounted	   mounted over    vfs	     date	 options
	       -------- ---------------  ---------------  ------ ------------ ---------------
				/dev/hd4	 /		  jfs2	 Mar 24 12:14 rw,log=/dev/hd8
				/proc		 /proc		  procfs Mar 24 12:15 rw
				/dev/fslv02	 /scratch	  jfs2	 Mar 24 12:15 rw,log=INLINE

   filesystems(4)
       Manpage includes all known options, describes the format and comment char's.

VERSION

       $Id: Aix.pm 128 2010-05-12 13:16:44Z trevor $

AUTHOR

       Nicola Worthington <nicolaw@cpan.org> - <http://perlgirl.org.uk>

       Jens Rehsack <rehsack@cpan.org> - <http://www.rehsack.de/>

COPYRIGHT

       Copyright 2004,2005,2006 Nicola Worthington.

       Copyright 2008-2010 Jens Rehsack.

       This software is licensed under The Apache Software License, Version 2.0.

       <http://www.apache.org/licenses/LICENSE-2.0>

perl v5.10.1							    2010-05-18						 Sys::Filesystem::Aix(3pm)