topic Extend vg without onlineJFS in Operating System - HP-UX

Extend vg without onlineJFS

ITSD-ACCS — Wed, 23 Aug 2006 04:51:39 GMT

Hi,

I heard that if my system does not have OnlineJFS installed, when I extend the VG, I got to boot to single user mode. Is that true ? and does any thing to do in cluster configuration ?

Thanks

Re: Extend vg without onlineJFS

Pete Randall — Wed, 23 Aug 2006 04:54:25 GMT

That's not exactly true. You can extend the VG online. However, when you go to extend the file system that is contained within the logical volume within the VG, you have to unmount the filesystem. Sometimes the only way to get that filesystem unmounted is to go to single user mode. If you can unmount the FS while online, then you're all set. Have a look at the EXAMPLES section of the man page for lvextend.

Pete

Re: Extend vg without onlineJFS

ITSD-ACCS — Wed, 23 Aug 2006 05:03:45 GMT

What if this mount point is a cluster shared VG ?

Re: Extend vg without onlineJFS

Piergiacomo Perini — Wed, 23 Aug 2006 05:29:31 GMT

Hi,
as far as i know
you have to boot to single user mode if you
want extend a lvol/FS like "/var" or "/" that are in VG00.

hth
regards
pg

Re: Extend vg without onlineJFS

Robert-Jan Goossens — Wed, 23 Aug 2006 05:40:57 GMT

Hi,

Adding A Disk To A Volume Group In A ServiceGuard Package
DocId: UXSGLVKBAN00000002 Updated: 20060605

US
http://www2.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000083137077

Europe
http://www4.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000083137077

Regards,
Robert-Jan

Re: Extend vg without onlineJFS

Sp4admin — Wed, 23 Aug 2006 11:09:58 GMT

Like Pete said,

If you can umount it you can extend it. for example /var or /tmp you need to go into singal user mode. If its a fs that the application is using then you would have to stop the app and umount. You the fuser command to see waht accessing the fs.

sp,

Re: Extend vg without onlineJFS

IT_2007 — Wed, 23 Aug 2006 11:29:06 GMT

If filesystem is not part of vg00 then you don't have to boot into single user mode. You can do it online by unmounting it and extend. Which filesystem are you talking about like oracle, SAP etc..?

Re: Extend vg without onlineJFS

ITSD-ACCS — Wed, 23 Aug 2006 20:40:17 GMT

This is an Oracle FS, and is also a cluster VG. The fact is, it will umount automatically when I shutdown the app by cmhaltpkg. Please help if I can still do it online ?

Re: Extend vg without onlineJFS

NMory — Wed, 23 Aug 2006 20:55:08 GMT

The vgextend command assigns additional physical volumes to volume group. The volume group must be active.

Volume groups are extended by adding one or more physical volumes.

After the physical volumes have been successfully added to the volume group, the disk space they contain can be allocated to logical volumes.

You can extend your logical volumes and VGs online, but not the file systems if you don't have OnlineJFS.

Basically if you don't have OnlineJFS there is no way to do that online. You will need to umount the filesystems in order to extend it. And sometimes the only way to umount it is to boot into single user mode. Try to umount online before booting into single user mode. All I/O into the file system have to be stopped in order to umount it (not busy).

LN

Re: Extend vg without onlineJFS

ITSD-ACCS — Wed, 23 Aug 2006 21:02:53 GMT

As said, the extend FS will be << umount >> by cmhaltpkg and I don't need to do it online. My concern is whether I need to do it using Single User mode.

Re: Extend vg without onlineJFS

nanan — Wed, 23 Aug 2006 21:16:35 GMT

Hi ITSD-ACCS
Shortly, No, you don't need to go to single mode.
you can do that in multi-mode

Regards
nanan

Re: Extend vg without onlineJFS

mohan singh — Thu, 24 Aug 2006 05:05:20 GMT

Hi,

Looks like a HA environment, If it is oracle file system. My advise create a new vg.

Mohan

Re: Extend vg without onlineJFS

mohan singh — Thu, 24 Aug 2006 05:10:54 GMT

Hi,

Looks like a HA environment, if you do not have JFS online you can not extend the file system on line. If it is oracle file system My advise is create a new vg.

Mohan