[Gllug] Multiple Raid Levels On Sarge

[Jim Bailey]

Hello,

I have a bit of a Frankenstein here that I am trying to work out the
best way of partitioning.

I have recycled an old machine with a Megaraid 4i card in it and I also
have 6 500GB PATA disk which I have fitted.  The problem is that the
Megaraid card can not deal with partitions over 2TB, I have therefore
split the raid into 2, 3 disk hardware raid 5 arrays.

My plan is now to use LVM to create a single 2TB logical array across
the two hardware raid 5 arrays.  I also know that with LVM I need a non
LVM boot partition so I have created a 200MB /boot which i would like to
have as raid 1 software raid across the two raid 5 hardware raids.  

The remaining space would all exist in LVM the primary purpose of the
system is to act as a storage area for a series of 14 day rolling
backups of a Virtuozzo Cluster's VPS using either the Virtuozzo backup
software or Bacula dependent on performance.  It secondary purpose would
be as a local mirror of the distributions used in the creation of the
VPSs.

Currently I have a partitioning schema of:

/boot		# 200MB Raid 1 software over 2 hardware raid 5
/root		# 500MB
/home		# 1GB
/usr		# 10GB
/var		# 10GB
/srv/mirror	# 100GB local mirrors for VPS creation and management.
/srv/backup	# Remaining space for VPS backups

I am basically going for XFS as the file system since it has the best
ratio of reliability and performance particularly with large file writes.

I supposed after all that what I am asking is can people see any gotchas
with this I am unsure of the reliability of the two raid 5 partitions and
or write performance.

-- 
Peace Jim :-)

 He who knows tells it not, he who tells knows it not.
 --Lao Tsu

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