Windows Small Business Server 2011 Standard 64-bit SP1
Intel Core i7 4770K @ 3.50GHz 48 °C
Haswell 22nm Technology
16.0GB Dual-Channel DDR3 @ 800MHz (11-11-11-29)
MSI Z87-G41 PC Mate(MS-7850) (SOCKET 0) 36 °C
Intel HD Graphics 4600 (MSI)
Hard Drives (3): Toshiba DT01ACA200 (2 TB drives)
HL-DT-ST DVDRAM GH24NSB0 SCSI CdRom Device
RAID 5 - two partitions/volumes
SBS 2011 with Exchange 2010 - 10 mailboxes
Windows works, however; transfer rates are a max of 4 MB / sec. When running "Hard Disk Sentinel" the "short test" which should only take a minute took 21 minutes last night on Disk #0 (did not have a chance to run the test on #1 and #2). However; this morning it took 1:15 min and the other two took 1:05 min.
A previous RAM test using Memtest86 came back clean - will be running it again this weekend.
A read test using "HD_speed.exe" showed no problem.
When attempting to transfer a file from C: to D: (same drives just different volumes) a 1.2GB file was estimated to take 5 hours. When transferring a file over the network the same problem occurred and it showed a transfer rate of 2 MB / sec.
It is not fully consistent and I don't know if this is a hardware (most likely) or a software (Windows OS) issue.
What I need to know is how I can figure the problem out and solve it.