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ESX Disk Configuration

Last Modified: 2016-11-23
Looking for a little input on this system configuration.  I have a DELL R520 in a remote office that as setup as a physical server.  Since we don't have much access to the site and limited HW budget for that office I wanted to rebuild the machine with ESXi to give us a little more flexibility to remotely spin up servers and perform maintenance.  At present the system has 8 x 7200RPM SAS drives configured as follows:

2 Drives Raid 1 with 1 Hot Spare (2 Partitions System and Data)
4 Drives Raid 5 with 1 Hot Spare (1 Large Data Partition)

We don't need anywhere near that level of data store at this location <1TB with the obvious need for some future growth.  I was planing to do the following:

Install Dell Internal Dual SD Module (IDSDM) with cards to run ESXi, thus freeing up my hard drives to be dedicated to VM hosting.  The question is would it make more sense to:

A) 8 Drives in RAID 10


B) 4 Drives Raid 10
     4 Drives Raid 10

From a performance perspective does it make any sense to create separate RAID 10 volumes?  Initially There would be a very light load File Server and a Read Only Domain controller running, but I'm looking to possibly host some redundant Web/DB servers on the box.  Again read only "reporting" DBs.  My first though was to run the DC and FS on the first volume and leave the second available for these additional system.  Possibly even putting the web boxes on VOL1 and leave VOL2 strictly for a DB.  

Am I over thinking this?  Should I just stick with a 8 drive RAID 10?
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