On 02/16/2011 07:16 PM, Matty Sarro wrote:
Out of curiousity, what is the maximum size volume that LVM can handle? I know that it sits as a wedge between the actual logical volume the system sees, and the hardware. Is there a limit? At the moment we are looking at a maximum storage of 72TB for log storage. My planned approach is to create a separate LUN and disk-group for each folder on our log server, and then create a logical volume and mount it under the FTP/NFS server's directory. Then as more storage is needed, simply create a new LUN on the SAN, add it as an LVM disk in the disk group for that particular folder, and let LVM handle growing the logical volume. Is it bound to the same disk max size as EXT3 (16TB)? Or is there another barrier to worry about? Am i misunderstanding the capabilities of LVM?
When considering storage at large quantities, the thing you have to start from is what happens at the logical volume level, where you have the filesystem. I believe that RHEL's ext3 and ext4 are still on a 16 TB per filesystem (aka logical volume) limit. If you wish to go larger per logical volume/filesystem, in RHEL you need to look at XFS. In RHEL 6, an XFS filesystem is supported up to 100 Tbytes.
To answer your original question, LVM2 on an 64bit CPU and a 2.6 kernel can support up to 8EB per single LV. So, the limit is not LVM but your filesystem choice.
GM -- -- George Magklaras Senior Systems Engineer/IT Manager Biotek Center, University of Oslo EMBnet TMPC Chair http://folk.uio.no/georgios Tel: +47 22840535 -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
