Originally posted by: Riker

I need to increase the maximum number of LPs in one of my LVs.  I haven't run this command before and don't have a test system available to try it out on and so don't know what to expect.  Can someone help me with the following:

• Can this be run safely with users on the system?
• When run, how long should the command take to return to a command prompt if the change is from Max 512 to Max 600?
• If the command fails, does it do so gracefully without making any changes or is it likely to corrupt the LV or file system in some way?

In general, it would be good to know which commands are safe to run when users are on and which are best run when the system is idle, but I'll start with this one.  :-)

Thank you.

Originally posted by: Fiyas

are you trying to increase LV size ? if yes then use below cmd 

example cmd:

chfs -a size=+1G /tmp

Originally posted by: GarlandJoseph

That increases the filesystem size, not the MAX LP size.

Originally posted by: GarlandJoseph

What command are you using?  What does LSLV show?  Why do you need to increase max LP's?   It is difficult to list in general what commands are safe to use, since there are a lot of commands.    While a command may be "safe to use", many organizations restrict changes of any nature (unless an emergency) to maintenance windows in order to prevent unforeseen changes not just in failure but also in performance.

Originally posted by: Riker

I was planning on running "chlv -x" to increase the MAX LPs.

LSLV shows 500 LPs in use with a MAX LP of 512.  My LP size is 256MB and I'd like to add another 40GB to the file system.

For the most part we're the same when it comes to managing changes to systems.  However, exceptions are made for those things considered "routine operational processes."

Originally posted by: GarlandJoseph

I am not sure this is the solution for your space issue.   What type of volume group does the LV belong: Big, Scalable?  
 

See this article by Brian Smith:

https://www.ibm.com/developerworks/community/blogs/brian/entry/deciphering_aix_volume_group_limitations_and_types10?lang=en

FYI:

Changing a scalable MAX LV to 1024 would look something like this:

varyoffvg <vgname>
chvg -G VG

chvg -v 1024 <vgname>

Originally posted by: Riker

This LV belongs to a normal volume group.

Originally posted by: GarlandJoseph

 Oops, I got confused and switched parameters on you by specifying MAX LV's and no MPX LP's.  I can change MAX LP's on an LV.  I don't think this is the answer to you space problem since you only have 256MB X 10 PP's of space.

Originally posted by: Shinyvictor

Just wanted to drop you a line, and tell you that this post helped me expand my filesystem, flawlessly. Thank you!

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Originally posted by: Riker

Group,

Thank you all for your help with this.  I confirmed with IBM that the chlv command can be run with users on the system.  I was able to increase the MAX LPs and then increase the size of the file system.

Regards,

Jason