XFS with md device on RAID5

[Darius Stout <darstout@yahoo.com>]

Hi SGI Technical Person!!!!!!

Thank you very much for your XFS port.  It is really
what Linux needed!!!!!!

The reason that I am writing to you is because of a 
FAQ that I read on your site that states that using
RAID5 on a "md" device makes "writes" slow.  BUT that
the performance can be "normalized" by setting up an
external log device.  I need help here because I have
never configuraed one before.  

My machine is a 1.8 P4 running two arrays of 12 100GB
data drives each.  I am running Adaptec 3940UW SCSI
adapters.  I installed your 1.02 SGI Installer with
Redhat 7.2.  I reconfigured everything to a vanilla
2.4.10 kernel and everything is running well. The 
System drives are 60GB EIDE in RAID1 mode. Everything 
is XFS.   

I have about 40GB of room left on the system drives.
Can I put the external logging for the two large 
arrays on the system drives?   Could you show me the
steps necessary to do this? 

This project is for a customer that is to be delivered
by the end of the month.  

Thank You very much for your consideration!!!!!!!

Your Friend in SGI,
Darius Stout

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