Anup Shukla wrote: > > I created 500G slices. Partitioned and mounted them > Then did a simple > "time dd if=/dev/zero of=/mnt/data1 bs=1k count=1200000" > This gave me a speed of over 150MB/s > > Then i deleted entire RAID thing.. recreate 2 LUNs > 30G, and whatever is left. > > Create a PV on the bigger drive with 1 VG and 3 LVs of equal sizes. > > Format and run the dd command again. > The speed is 130MB/s now. > > Its a bit confusing. > Does LVM slow down things? Or i did something that is not really of any > relevance to check IO speed. > > I used mkfs.ext3 -m0 -E stride=96 -O dir_index /dev/sdb1 ... > I have a RAID5 volume consisting of 6 disk with stripe size = 64k > I hope the stride=96 is optimal. > > Should i stick with LVM, or go back to the older way? > > Thank you. > On second thoughts, i have gone completely off-topic now. It isn't CentOS anymore. So it would be appropriate for me to end this topic here. Thanks for the help. Regards, A.S