exchange server is running out of space

Our exchange server is running out of space. Should I put 2 message stores to each logical drive, or should each store have its own disk array for optimum performance? What’s the performance loss, assuming that the two stores have fewer users than the previous larger store? Is it better to use RAID 5 or RAID 1 for your message stores?
ScottSullivanPFSAsked:
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SembeeCommented:
Which is better?
That is very objective.

I have done both, and haven't seen a significant change in either. The major performance gain comes when you split the transaction logs and the database on to separate drives.

It also depends on how many users and what size are the mailboxes.
What I would do for 10 users with 20mb mailboxes and what I would do for 2000 users with 400mb mailboxes are very different.

In an ideal, money no object world, you would have a separate array for each storage group and each set of transaction logs. Not many of us work in an ideal world.

Unfortunately you haven't really provided enough information to answer comprehensively, and it would probably be difficult for you to do so. I configure servers in a different way for most clients, based on their individual needs.

Simon.
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ScottSullivanPFSAuthor Commented:
I have 800GB of email and 1200 mailboxes. I have 16 disks to work with. Transaction logs are already on separate RAID 1e (similar to 10) disks—I think 6 of the 16 disks are used by transaction logs. I do have transaction logs from 2 of the storage groups writing to the same logical disk—would that cause serious performance issues?

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SembeeCommented:
Shouldn't cause any problems.
What sort of transaction logs do you create between backups? The only thing I might have considered doing instead of six disks in a single set was three lots of two. That may squeeze a little more out - but you aren't going to gain much.

Have you run perfmon on the box to see if you are getting any disk performance issues?

Simon.
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ScottSullivanPFSAuthor Commented:
I am getting performance issues on a storage group with 600 users. I’ll try and spread them out.
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