Morten Torstensen wrote:
Anup Shukla wrote:
Still, given the suggestion, i will surely try to reduce the number of slices.
I would make one system LUN at say 20GB and one data LUN with the rest of the RADI5 space.
On the system LUN I would make a /boot filesystem and a LVM partition with at least a / filesystem and swap. Usually I make /, /usr, /opt, /home, /var and /tmp but it varies a bit depending on what kind of machine it is.
The data LUN I would use as a PV directly for LVM and not bother with partitions at all.
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.
Regards, A.S