Hello, garethm!

Monday, February 4, 2013, 11:07:53 AM, you wrote:

g> We have a customer using a Firebird 2.0.6 Classic Server database
g> on a single disk connected to an IBM ServeRAID M5015 SAS/SATA Controller. The disk is
g> not part of any RAID array. The server is running Windows 2008 R2 64-bit.

g> Performance in this configuration is much slower than when the
g> disk is not connected to the RAID controller. Other applications and database services
g> running on the same hardware do not have any difference in
g> performance based on how the disk is connected to the computer.

My opinion is simple. If
Firebird DB at disk, attached not to RAID - fast
and
Firebird DB at dis, attached to the RAID - slow
then problem is with raid controller configuration.

"Other applications" can use disk less then Firebird, or
only read, so, the IO of that applications can be much less than FB's.

Have you tried on that configurations any common disk test utilities?
From simple like CrystalDiskMark, HDTune, etc, to IOMeter?
You have not seen any difference?

--
Dmitry Kuzmenko, www.ib-aid.com