I am currently trying to figure out what would be the best configuration for a new SAN for SQL Server 2008 Cluster. Right now I have a SQL cluster that is using a LUN on my companies existing SAN but the performance just isn't cutting it anymore and they have allowed me to purchase a new SAN, however I need to come up with the Hard Drive configuration first (we don't have a real SAN Administrator). Based on some articles I have read (I have been at this for 2 days) I have come up with the following configuration. Our databases are a combination of heavy Read and heavy Write databases. 16 Drive SAN: Virtual Disk 1 (8 Disks): RAID 10 - Data files Virtual Disk 2 (2 Disks): RAID 1 - Log files Virtual Disk 3 (2 Disks): RAID 1 - Temp DB Virtual Disk 4 (4 Disks): RAID 5 - Backups Can anyone offer any advice on this configuration? If it is good or bad, or if anything should be changed. Also, for the Quorum and MSDTC shared drives I was thinking about carving them out of Virtual Disk 4, would there be any negative effects to do this? Also, since we are going to present the new SAN to the Cluster through iSCSI I was thinking about puting 2 NIC's in each of my server nodes and have one NIC for transactions between SQL and my application servers and the second NIC for connectivity between SQL and the SAN. Is there any advantage to configuring my new SQL cluster in this manner or will I gain nothing from it? We have multiple VLAN's in my office and usually SAN's are put on the management network and the servers on a server network. The VLAN's seem like they are used more for device organization since the devices can talk to each other across the VLAN, however I am not a network guy so I don't know all the intricacies of what my networking team is doing. Thank you for any input anyone can provide.