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Full Discussion: expanding the size of vg
Operating Systems AIX expanding the size of vg Post 302247683 by bakunin on Thursday 16th of October 2008 08:04:50 AM
Old 10-16-2008
Quote:
Originally Posted by manoj.solaris
I have created the lun of 15gb and assigned to aix,but now I want to expand the size of lun 15gb to 30gb,
You can do so with certain SAN subsystems, but not all. IIRC DS8xxx models can do that but (older?) DS4xxx models can't.


Quote:
1)wheather i have to umount that partition on aix side before increasing the size of lun on storage side or directly I can increase directly size of lun storage side
No LUN is "mounted", because a LUN is neither a FS nor does it resemble one. A LUN is analogous to a (physical) disk. Physical disks (PVs) are merged into volume groups (VGs) on which logical volumes (LVs) are created on which in turn filesystems (FSs) could be created. Only these filesystems are mounted, not the other logical entities.

(Sorry for maybe being overly exact, i have seen people not being able to grasp the differences mentioned above and for that reason not being able to use LVM correctly.)

If you mean to "varyoff" the VG during the change: no, this is not necessary. Either the SAN subsystem can do dynamic changes of LUNs, then you can do it during uptimes or the SAN subsystem can't do that, then you will have to create a new (bigger) LUN, add it to the VG (extendvg) , move the LVs to the new LUN (migratepv), get the old LUN out of the VG (reducevg) and delete it. It might be sensible to do that during downtime because of performance degradation (depends on your system and what it does), but it is not necessary.

Quote:
2)wheather i have use any other command along with extendvg
See above, that depends on what your subsystem supports and how a possible degradation of disk performance may interfere with the goals of your installation. Only you can take this decision, because you know your system best.

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

tgt-setup-lun

tgt-setup-lun(8)					      System Manager's Manual						  tgt-setup-lun(8)

NAME

       tgt-setup-lun - creates a target, adds a device to the target and defines initiators that can connect to the target

SYNOPSIS

       tgt-setup-lun -d device -n target_name [initiator_IP1 initiator_IP2 ...] [-h]

DESCRIPTION

       Starts tgtd if necessary and creates a target according to the supplied target_name. The format of the target name is as follows:
       iqn.2001-04.com.<hostname>-<target_name> The target name must be unique.

       The  script then adds the requested device to the target. If specific IP addresses are defined, it adds them to the list of allowed initia-
       tors for that target. If no IP addresses is defined, it defines that the target accepts any initiator.

EXAMPLES

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81

       Create a target that uses /dev/sdb1 and allows connections only from 192.168.10.81 and 192.168.10.82:
       tgt-setup-lun -d /dev/sdb1 -n my_target 192.168.10.81 192.168.10.82

       Create a target that uses /dev/sdb1 and allows connections from any initiator:
       tgt-setup-lun -d /dev/sdb1 -n my_target

       Display help:
       tgt-setup-lun -h

AUTHOR

       Written by Erez Zilber

REPORTING BUGS

       Report bugs to <stgt@vger.kernel.org>

COPYRIGHT

       Copyright (C) Voltaire Ltd. 2008.

																  tgt-setup-lun(8)
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