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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

ql-dynamic-tgt-lun-disc

ql-dynamic-tgt-disc(8)					       System Administration					    ql-dynamic-tgt-disc(8)

NAME

       ql-dynamic-tgt-lun-disc - Scans for newly added LUNs.

SYNOPSIS

       ql-dynamic-tgt-lun-disc [OPTIONS]

DESCRIPTION

       Dynamic TGT-LUN Discovery Utility

       This  utility  scans  for  newly added LUNs. After adding new LUNs, you do not need to unload, then load the QLogic FC driver or reboot the
       system

       To begin scanning the LUNs issue following command:

	      # /usr/sbin/ql-dynamic-tgt-lun-disc

       -al,   --allow-lip
	      LIP is not issued by default, even if it is required for scanning new LUNs Setting this option, allows the utility to issue LIP.

       -cl, --current-luns
	      Displays LUNS currently present

       -e,  --extended-scan
	      Use this option as "-e | --extended-scan". to rescan LUNs. This will identify any change in attributes of existing LUNs. This option
	      can be used in combination of scan/refresh or max luns

       -h,  --help, ?
	      Prints this help message

       -i,  --interactive
	      Use this option to use the menu driven program

       -is,  --iscsi
	      Use this option to operate on ISCSI HBAs, this option can be used in combination of any other supported option.

       -m,  --max-lun
	      To set the maximum LUNs to be scanned

       -p,  --proc
	      Use PROC file system for LUN scanning

       -r,  --refresh
	      To refresh, that is remove LUNs that are lost use the options "-r|--refresh". This will remove the LUNs which no more exist.

       -s,  --scan [ -r|--refresh ]
	      The QLogic LUN scan utility re-scans all the devices connected to the QLogic HBA

SEE ALSO

       ql-lun-state-online(8), ql-hba-snapshot(8), ql-set-cmd-timeout(8)

Matthias Schmitz <;matthias@sigxcpu.org> 			     July 2009						    ql-dynamic-tgt-disc(8)
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