Exchange 2007 8 Disk optimal configuration

I would like to know the optimal disk/array configuration of an exchange 2007 build with 1 storage group using 8 discs.
rymattcartIT DirectorAsked:
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-DJL-Connect With a Mentor Commented:
I'm not a huge fan of RAID5 - its slow.

Putting Logs and Database on the same volume regardless of partitions is not ideal.  If the volume fails you lose both DB and logs.  Also, database reads and writes are random, logs are continuous.

I like the setup below.
OS/Exchange binaries - RAID 1 (2 disks)
Exchange Transaction Logs - RAID 1 (2 disks)
Exchange databases and other - RAID 10 (4 disks)

Forget page file on seperate disk - not worth it.

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-DJL-Commented:
Could really do with some more information.  How big are the disks, how big is your exchange store likely to be? Do the 8 disks include the operating system or are they just for exchange storage?

Do you want the system optimised for speed, redundancy or both?

Generally you should have the database and log files on separate physical drives.
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mass2612Commented:
Hi,

As DJL- says you really need more info. For a start it depends on the size of the disks etc. I would go with : -
OS/Exchange binaries - RAID 1 or 10 (2 disks)
Exchange Transaction Logs - RAID 1 or 10 (2 disks)
Exchange databases and other - RAID 5 (4 disks)

http://msexchangeteam.com/archive/2006/04/07/424645.aspx
http://technet.microsoft.com/en-us/library/bb124518.aspx
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rymattcartIT DirectorAuthor Commented:
Well I was thinking of 74Gs for the OS and transaction log arrays and 146G for the database.  

mass2612 dont I need 4 disks for Raid10?  
 
How about the following options?
OS/Exchange binaries - RAID 1 (2 disks)
Exchange Transaction Logs - RAID 1 (2 disks)
Exchange databases and other - RAID 5 (4 disks)
OR
OS/Exchange binaries - RAID 1 (2 disks)
Exchange Transaction Logs - RAID 1 (2 disks)
Exchange databases and other - RAID 5 (3 disks)
Pagefile (1 disk)

OS/Exchange binaries - RAID 1 (2 disks)
Exchange Transaction Logs - RAID 1 (2 disks)
Exchange databases and other - RAID 10 (4 disks)

How much of a performance enhancement is separating the pagefile?

I would like the system optimized for speed keeping in mind the idea that there is a wansync "double" at a DR site/

This server will really serve @75 users with 300M-1G mailboxes.
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ATIGCommented:
I would just Mirror your OS and Raid 10 the rest of the disk........

that keeps it simple, and 10 is better then 5 but if you do that break the disk into partitions to seperate the data however that will spread your I/O over 6 disks

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rymattcartIT DirectorAuthor Commented:
interesting.
What are the implications with spreading the IO over 6 disks?
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ATIGCommented:
the more disks the better I/O which is where most bottleknecks are....

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ATIGConnect With a Mentor Commented:
DJL-- I agree about optimal,  and there is as much redundancy in a 10 as 1 but better i/o due to increased number of disk.......

doing 2 mirrors and a 10 is acceptable

It would appear this is a small environment with 1 SG  and simple just seems better...... for them

either way it will functionl and meet there needs most likely.....
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rymattcartIT DirectorAuthor Commented:
thanks guys I appreciate the suggestions and both would in fact work for me.   will go with the 3 array situation to separate logs and db...
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