Windows Server 2008 R2
Two logical drive partitions
The server in question has four drives in a RAID 10 configuration, as well as two in RAID 0. The RAID 0 is used for the OS and is behaving itself. The RAID 10 is divided into two logical drives, D and L. The L drive performs as expected, but we're seeing very poor performance on D, despite it being part of the same RAID.
How do I go about diagnosing the problem, and hopefully fixing it?
EDIT: As it turns out, I was misinformed. The L drive is partitioned off the wrong array. This solves the peculiarity of the problem, leaving a separate array slowness issue that can be diagnosed through conventional means.