difference between online jfs and lvm

[Shivkumar]

Dear Sirs,

What is the difference between online jfs and lvm ?

Thanks,
Shiv

[Bharat Katkar · Accepted solution]

Hi Shiv,

Online JFS is type of FileSystems and LVM is Logical Volume Manager which Manages Volume Groups and Logical Volumes.

FileSystem is created on Logical Volume.

Now when you have Online JFS (Journal File System)then you can do much of File System Administration Online i.e. while the file system is mounted and in use like you can extend this file systems without unmounting it which is not the case with normal vxfs filesystem.

Hope that helps.
Regards,

[Sudeesh]

Shiv
Online JFS is a product which will enable you to perform some more advanced tasks with Vxfs (Veritas filesystem or journal filesystem). Online JFS enable:
1. Extend and reduce filesystem online.
2. Online filesystem backup through snapshot.
3. Online defrag and re-organization of filesysetm.

Where as you know LVM is a Volume Mnager, which helps you to manage your disk storage.

The only relation is that a filesyetm is created (veritas or HFS) over a logical volume.

Sudeesh

[Mahesh Kumar Malik]

Hi Shiv

Online JFS allows On Line administration of Files Systems while LVM is Logical Volume Manager used for Disk Partitioning. Following links may be useful

http://docs.hp.com/en/B3929-90011/ch01s09.html?btnPrev=%AB%A0prev

http://docs.hp.com/en/B2355-90672/ch03s06.html

Regards
Mahesh

[Cem Tugrul]

Shiv,

also here is a useful pdf about online jfs
Good Luck,