OT:Linux question

[Boaz Bezborodko]

While I risk angering Mark for an OT question on Linux, I trust you guys 
the most on these issues.

I have a question regarding expanding storage on Linux.  I have an old 
Proliant system running Centos 4 with a raid array.  I've replaced older 
73GB drives with 146GB drives and I wanted to extend the volume size.  
The HP Array Cofiguration Utility is giving me a warning that some OSes 
don't support "extending" the volume and that this might make the data 
unavailable to them.

Will LVM on Centos 4 recognize this and be able to increase the volume?

If yes, should I dismount the volume before running the operation?

Thanks in advance.

Boaz