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Full Discussion: Add new disks and expandlv
Operating Systems AIX Add new disks and expandlv Post 302350566 by bakunin on Friday 4th of September 2009 08:39:52 AM
Old 09-04-2009
First, add the disk(s) to the volume group in question. You have already figured that out:

Code:
extendvg <VGname> <diskname>

example: extendvg myVG hdisk99

Then issue a "lsvg <VGname>" and you will see the added available PPs. These are available to expand your file systems/logical volumes.

It is possible to directly increase the FS and LVM will automatically extend the LV for you but i want more control over this process so i habitually extend the LV first and only then the FS:

Code:
extendlv [-m<mapfile>] <LVname> <NrOfPPs>
or
extendlv <LVname> <NrOfPPs> [<PVname>]

example: extendlv MyLV 5
will increase the size of MyLV by 5 times the PP size. If MyLV is mirrored a multiple of 5 PPs will be added,
depending on the number of mirrors configured.

Then expand the filesystem to make use of the additional space in the LV: first convert your PP size to 512-byte-blocks:

blocks = <nr of PPs> * 2 * <PPsize in kb>

example: PP size is 256G, 2 PPs added:

2 * 2 * 1024 * 1024 * 256 = 1073741824

Then use this number to add that many blocks to your fs:

Code:
chfs -a size=+<nr of blocks> <FS>

example: chfs -a size=+1073741824 /my/file/system

You can do all this while the system is under load, there is no need to unmount anything, let alone stop the system.

I hope this helps.

bakunin
 

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LEARN ABOUT HPUX

extendfs_hfs

extendfs_hfs(1M)														  extendfs_hfs(1M)

NAME

       extendfs_hfs: extendfs - extend HFS file system size

SYNOPSIS

       size] special

DESCRIPTION

       If  the	original  HFS  file  system  image  created on special does not make use of all of the available space, the command can be used to
       increase the capacity of an HFS file system by updating the file system structure to include the extra space.

       The command-line parameter special specifies the character device special file of either a logical volume or a disk partition.  The special
       must be unmounted before the command can be run (see mount(1M)).

   Options
       recognizes the following options:

	      Specify the HFS file system type.

	      Query the size of
			special.  No file system extension will be done.

	      Verbose flag.

	      Specifies the number of
			blocks to be added to the file system.	If the number of blocks is not specified, the maximum possible size is used.

EXAMPLES

       To increase the capacity of a file system created on a logical volume, enter:

WARNINGS

       The  root  file	system	cannot be extended using the command because the root file system is always mounted, and the command only works on
       unmounted file systems.

       will fail if used on a file system, on a logical volume, where the logical block size of the logical volume is greater than the	file  sys-
       tem's fragment size.  The logical block size, of a logical volume changes, when additional disks with larger sector size are added.

RETURN VALUE

       returns the following values:

	       0	No errors were detected and file system was successfully extended.
	       1	Command aborted.

SEE ALSO

       extendfs(1M), lvextend(1M), mkfs(1M), mount(1M), umount(1M).

																  extendfs_hfs(1M)
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