[linux-lvm] LVM on H/W RAID5s ?

Joseph Kezar jkezar at doc.state.vt.us
Tue Jan 21 16:48:01 UTC 2003

I've noted some high load issues with LVM on our RAID5 as well.  I thought
it might be a hardware compat issue.  But now I am leaning towards LVM/RAID5
performance issues.

Our server performs fine.  But when I need to rsync from the JBOD to the
local disks the load jumps anywhere between 10 and 20!.

----- Original Message -----
From: "Ajay Shekhawat" <ajay at cedar.buffalo.edu>
To: <linux-lvm at sistina.com>
Sent: Tuesday, January 21, 2003 4:31 PM
Subject: [linux-lvm] LVM on H/W RAID5s ?

> I'm trying to combine two H/W RAID5 arrays (6 disks each on a ICP-Vortex
> 8643RZN controller) into 1 device using LVM, with XFS as the filesystem.
> Unfortunately, I'm getting terrible read rates (I'm doing my own
> with 1 process creating files of about 400K each, and another process
> reading and deleting the files). Just an 'ls' in a directory with
> 1000 files takes forever. A stat+unlink call in perl takes 1sec.
> Are there any 'gotchas' with this sort of a setup?
> The RAID5 partitions themselves work pretty OK by themselves.
> The hardware:
> - dual Xeon 2.0GHz w/ 2GB memory
> - ICP Vortex 8643RZN card
> - 73GB Fuji 10KRPM disks, 14 of them on a controller.
> Any tips, pointers, etc. would be appreciated.
> Ajay
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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