I am new to Linux and very new to the RAID world.

For a small-to-midrange(80-195 users) enterprise suggestions and 
recommendations are required for the following

1) Mail Server(Postfix)
1a) what would be the best and recommended RAID-level(1 or 5) of the 
volume for the Linux OS ?
1b) what would be the best and recommended RAID-level(1 or 5) for 
the volume that contains user's mailboxes ?

I am sharing my own plan
for (1a)
Linux OS "/" raid-level 1: /dev/md0 (/dev/sda1, /dev/sdb1, /dev/sdc1)
here /dev/sdc1 is spare

for (1b)
mailboxes(/var/spool/mail) raid-level 1: /dev/md1 
(/dev/sdd1, /dev/sde1, /dev/sdf1)
here /dev/sdf1 is spare

for my enterprise speed(read/write) is more important then 
redundancy.




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