I am trying to determine what RAID controller will get me what I want without throwing money at the issue. My situation is this, I have several servers that need a RAID controller to be VMWare compatible. I can make use of these systems as replication or mass storage devices. Very few active VMs will be used. expected stats are:
-IOPS will rarely exceed 500, never exceed 800.
-RAID5 desired, but RAID 10 is ok
-not mission critical servers
-array 1 will have 8 x 300GB 15k SAS (server 1) - this array may hit 800 IOPS under unusual conditions
-array 2 will have 4 x 500GB 7.2k desktop drives (server 2) - this array will only get server replications that max at 50MB/s
-array 3 will have 8 x 500GB 7.2 desktop drives (server 3) - this array will only get server replications that max at 50MB/s
What I have been experiencing with Adaptec 5805 RAID controllers in RAID5 is that the arrays degrade under high usage (i think). What i can tell you is that between two servers, each with 8 15k SAS drives, the arrays have degraded no fewer than 20 times (but I do have 8 active VMs on them). I'm a bit gun shy of even considering Adaptec as they don't even acknowledge their product could have this problem.
I have been told LSI is the top dog with RAID controllers these days and their reps gave me a model number of 9271-8i or 9266-8i. Can anyone confirm that this is about the minimum i would need for the 8 x 15k SAS drives?
If any controllers can handle the desktop drives well with VMWare 5.5 that would also be valuable info.
I know this is lengthy, so I'll say in advanced, thank you for taking the time to read and respond to this.