[K12OSN] Impact of filesystems on performance

[Eric Feldhusen]

Chris Kacoroski wrote:

> Hi,
> 
> I have been doing some testing of a 3ware raid card and found a problem 
> with ext3 filesystems on the 3ware card (not sure if this applies to 
> other kinds of raid devices).  Tests to replicate are
>
> Using Ext3, when doing a single read or write I was getting 41MB/s, 2 
> concurrent writes was 36MB/s, and when I changed to a concurrent read 
> and write it dropped to 4.5MB/s.   On the advice of 3ware I changed to 
> the jfs filesystem and saw a big improvement.  Single read or write is 
> 60MB/s, 2 concurrent writes are 79MB/s, a concurrent read and write was 
> 99MB/s, and 1 read with 2 writes concurrently was 100MB/s.

Has anyone seen similar results with the 3ware 7500 and parallel ata 
drives?  I run my samba/apache/cups file/print servers on 3ware 7500 
with 200GB ata drives with ext3 on Redhat 8.  And based on what I've 
been seeing with webminstats, and just watching the throughput when I 
copying a couple of gigabytes of files while users logging in and out 
and moving their windows profiles back and forth, I see the file system 
really slow down.

-- 
Eric Feldhusen
Network Administrator for Adams, Chassell,
Dollar Bay-Tamarack City, and
Lake Linden-Hubbell Public Schools
emailto:eric at remc1.k12.mi.us