> From: Marian Csontos <mcson...@redhat.com> >> The origin of my problem is indeed the poor performance of RAID5, >> which maxes out the single core the driver runs on. But if I accept that >> as a given, the next problem is LVM striping. Since I do get 10x better
>What stripesize was used for striped LV? IIRC the default is 64k. I ran "lvcreate -L 2400G -i8 -I512 -n volume-name group-name". And I tried various numbers, 512 was the greatest I could set but does not seem to be crucial for performance. > IIUC you are serving mostly large files. I have no numbers, and no HW to > test the hypothesis, but using larger stripesize could help here as this > would split the load on multiple RAID5 volumes, while not splitting the > IOs too early into too many small requests. File size are typically a few megabytes. I guess the file abstraction is not visible on the LVM layer though, but at least there won't be many blocks with a lot of unused space. _______________________________________________ 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/
