[CentOS] Centos 5 on Large Disks

[Anup Shukla]

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