A doubt reg extending LVs

[Gamoji Raghavendra]

HI gurus,
I need ur suggestion regarding extending the size of an LV.

Generally if I need to extend the size of /var mounted on /dev/vg00/lvol9, I do the following :
1. lvextend -l /dev/vg00/lvol9
2. /usr/lbin/fs/vxfs/fsadm -F vxfs -b /var
In this process, I need not umount /var.

But HP-UX manuals tell that to extend a LV,
1. lvextend -l size /dev/vg00/lovl9
2. umount /var
3. extendfs -F vxfs /dev/vg00/rlovl9
4. mount /var

But both the processes do the same.
No my question is which is safer?
Is there anything wrong/harmful in my approach?
What is the difference between both of them?

I'ld appreciate any help/clarifications in this regard.

TIA,
Raghu.

[Bill McNAMARA_1 · Accepted solution]

But both the processes do the same.
>> YES

No my question is which is safer?
>> neither

Is there anything wrong/harmful in my approach?
>> Apart from the tipo in the second 1.
>> No.

What is the difference between both of them?
>> Online JFS is an optional
>> pay for product and not
>> available on default install

Later,
Bill

[Victor BERRIDGE]

Hi,
Nothing wrong... One suggest you HAVE online JFS, the other is for the poor guy who will have to go single user to be sure to unmount /var and therefore can not use SAM to accomplish the task...

All the best
Victor

[Sunny D]

Hi,
The only time you need to umount a filesystem is if you don't have onlinejfs, the best way to check is by:

swlist |grep -i online

If it comes back with anything then you dont need to get involved with umounting the directory otherwise as the /var directory is constantly being used you will require to bring the maching down to single user mode and then umount the filesystem.

Good luck and hope this helped.

[Sunny D]

Hi again,

Sorry I should have been more precise. When you run the swlist |grep -i online command the returned output you should be looking for is like this:

B3929BA B.11.00 HP OnLineJFS (Advanced VxFS)

Obviously depending on your OS version the B.11.00 will change to say B.10.20, if you have the version for example.

Rgds