[CentOS] Centos 5 on Large Disks

Anup Shukla anup at iamcool.net
Wed Oct 24 10:30:20 UTC 2007

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.


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