I'm looking to reconfig our disk IO subsystem due to the fact that the IO on the data drives is constantly pegged. Currently, have 3 databases (with a fourth on the way). Two are highly write-intensive and transactional (i.e. inserting/deleting/updating thousands of records/sec). The fourth will also be heavily transactional. The other database is a "summary" database of all the other five. It contains only about 200k records, but each record is updated when the 60k or 70k records in the "Child" databases are changed. Current config is as follows: Dell Server w/ RAID 1 (2 73 GB 10k UltraSCSI drives) * Holds O/S and SQL Server Program files, as well as Master, modal, msdb SCSI controller w/ 2 channels going to DAS with capacity for 14 drives. Setup is as follows: RAID 5 (3 136 GB 10k UltraSCSI drives) * Holds all MDF files RAID 5 (3 73 GB 10k UltraSCSI Drives) * Holds all LDF files Single 36GB UltraSCSI 15k * Holds TempDB (I know this should be RAID, this wasn't my work...) Single 136 GB 10k UltraSCSI Drive (hot Standby) Budgeet is available to fill out the array, maybe get some faster drives, and get a second DAS and SCSI card to attach to the server. This would give us a total of 28 drive capacity in the DAS arrays, and the single RAID-1 on the server. Thoughts on Configuration * Is it better to do a 4-disk RAID 1+0 for each data file or a 5-disk RAID-5 * Should the database files be on their own array? Also, if someone could help come up with some sample configs, that would be much appreciated. Thanks.