Hello list! I've recently subscribed here as i have some questions about LVM, particularly the performance impact of LVM on disk IO. I'm a happy LVM user, on my workstation at home i've used it for a long time. No special setups or anything, but it's nice to be able to resize partitions on the fly, or have a number of disks act as one huge disk... So, when I had to reinstall all servers for the company I work for, i decided to use LVM for the same reasons stated above. But now i wonder: Does LVM have any impact on disk IO? Are there any tests done on this subject? I couldn't really find any on the internet. Most of the things you find are implementation issues and 'how does it work' stuff ;-) I'm running LVM2 (2.02.06) on Debian 'sid' (unstable, but i hate that word) using linux kernels 2.6.17.xx. For example, one of my servers has 4x 34gb SCSI disks and 2x IDE disks. One of the IDE disks has a 250MB boot partition, the rest is LVM partition, the other IDE disk has one big LVM partition, same goes for the 4 SCSI disks. Then i made a scsi_vg01, with all the scsi disks and a ide_vg01 with all the ide disks, and started lvcreating "partitions" inside those vg's. That's basically how i set up LVM on all of my servers. Some servers have different disk-configurations though... Can anyone shed any light on this approach? Are there impacts on performance of read / write actions? Any information is welcomed. Hope to hear from you all! Kind regards, Sander. -- | $ perl -e 'length q bless glob and print chr oct ord q mkdir m and print \ | chr ord q xor x and print chr ord q q q and print chr ord uc q map m and \ | print chr ord q qw q and print chr ord q each le and print chr ord q my \ | alarm and print chr oct oct ord uc qw q for q' - Don't you LOVE perl? _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
