Raid vs LUN Does it matter.
Posted on 2013-10-29
I have two16 Bay servers Identical specs that I am using as SAN Storage devices (they will replicate for redundancy). Each has two 8 Port Raid Cards. Each card has 8 SAS drives attached. Each SAN server has:
Raid Card 1 has 8 drives x 136 GB each
Raid Card 2 has 8 drives x 79 GB each
I am setting up a hyper-V cluster. DUAL XEON Quadcore each at 1.87GHz with 30 GB Ram. The SAN servers will have my iSCSI targets connected via dedicated private network using gigabit ethernet cards and switches.
The virtual Machines I have for he cluster are as follows.
1 SQL Server 2005 on 2008 Server (accounting and CRM databases) 10 users
1 Terminal Server on 2008 Server 5 Terminal users
1 e-commerce on 2008 Server
1 Phone System Management on 2008 Server
I am trying to figure out what is the best way to divide the disks for best performance.
Should I make 4 raid10's and put each VM on it's own raid 10 which gives only 4 drives for each VM? Or should I make 2 large Raid10's and create 4 luns, 2 on each card.
The e-commerce and phone server are not huge and don't grow much but phone has decent activity recording calls, routing phones, voicemail, etc... and ecommerce has about 20 transactions a day.
the Hyper-V servers will have two MPIOs per server for load balancing and redundancy should a switch fail.
There are about 20 users accessing the various stuff through out the day.