[Beowulf] LVM performance problems
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Judd Tracy jtracy at ist.ucf.eduFri May 4 06:40:37 PDT 2007
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I am trying to bring up a small file server and am noticing some serious performance issues when using LVM. I created a software raid /dev/md0 which I can read at ~195MB/s using the raw raid device, but as soon as I put LVM on top of it the read speeds drop to ~95MB/s using a raw lvm partition without a filesystem. When I use and xfs filesystem on top of the lvm partition it drops down to ~40MB/s. This seems like a processing power issue, but the machine is a dual processor opteron system with 4GB of ram in it. Does anyone have some insight into why I might be having such problems with the system. Judd Tracy Institute for Simulation and Training University of Central Florida
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