Database question for exchange 2010 disk

I was wondering if it ok to have 2 disk for an exchange server( E and F for ex:), which both disk have different dbs on them, to have their disk both come from the same VMware data store?
Or is it best to have the disk go to different data stores?
Or does it not really matter which way you set them up?
Thanks
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vmichAsked:
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Adam BrownSr Solutions ArchitectCommented:
If you are using multiple Databases, it's usually best to make sure they are stored on different physical disks/arrays to improve performance. So if your VM Stores are segregated by physical disk, then make sure they use different stores. Also make sure your Log Files are on a completely different Physical disk than the database files, since having those on the same drive will cause restoration issues if the drive fails.
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vmichAuthor Commented:
Well the disk are coming from a san and I do have the logs on their own lun/disk
Then we will be setting up multiple dbs for exchange. Each drive will have like 15-20 dbs on it of no more than 200GB each. So I was wondering if I can have 2 different disk setup from the same data store but each will have different dbs?
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achaldaveCommented:
Ideally all databases and their logs should be on separate LUNs on physical servers to achieve similar on virtual environment each database and logs should be on separate vmdk on separate VMFS data store and the VMFS data store should not contain any other virtual machine data  so you might need to create 30-40 luns (15-20 for DB and 15-20 for logs), data stores and vmdks. use mount point to mound disk in empty folders instead of assigning drive letters to each disk. You also need to talk to your storage engineer for recommended settings provided by storage provider.
Link below is best practice guide from Vmware
http://www.vmware.com/files/pdf/exchange-2010-on-vmware-best-practices-guide.pdf
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vmichAuthor Commented:
Ok I guess I may have been unclear on my setup..
What I meant was, that I have one exch mb server which has a 1.5TB disk and under that I have multiple dbs of which none will ever be bigger than 200GB. We have about 80 dbs that need to be setup so I am creating multiple disk and each will have multiple dbs under it.
So my questions was, can I have 2 vm disk from 1exch mb server connected to the same data store?
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achaldaveCommented:
Yes the disks can be on same storage but the performance will definitely impacted depending on virtual infrastructure, storage design and number of disks on same data store.
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vmichAuthor Commented:
achaldave,
What about the number of dbs being under one disk..
I have to setup 80 dbs and my plan was to have multiple disk with multiple dbs under them..
The disk were going to be 2TB in size, but we will not be letting any db get larger than 200GB.
So would there be a set number of dbs that could be on one virtual disk on each exch server in the DAG
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achaldaveCommented:
That depends on your mailbox traffic and IOPS your storage can handle. You need to calculate IOPS for each database and compare it with maximum IOPS your storage can handle on same LUN. This link will help you determine IOPS requirement.
http://technet.microsoft.com/en-us/library/ee832789(v=exchg.141).aspx
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Gerald ConnollyCommented:
Your LUNs are coming off a SAN, but that doesn't  guarantee that they are coming off a separate set of spindles
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vmichAuthor Commented:
db setup
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