Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 25)

Setting the SCSI Host Adapter IDs
After you enable cluster mode on the PERC card, you have the option to change the SCSI ID for both of the adapter's
channels. For each shared SCSI bus (a connection from a channel on one system's PERC card to the shared storage enclosure
to a channel on the second system's PERC card), you must have unique SCSI IDs for each controller. The default SCSI ID for
the PERC is ID 7. Thus, the SCSI ID for one of the system's PERC cards must be configured to ID 6.
For cluster configurations with two PERC cards in each node connected to shared storage enclosures, set both controllers in
one system to SCSI ID 6; that is, one node's pair of PERC cards utilizes SCSI ID 7 (default) and the other node's pair of PERC
cards is changed to utilize SCSI ID 6.
See the PERC documentation for more information about setting the SCSI host adapter ID number.
NOTICE: If you replace a PERC card, you must set the appropriate SCSI ID before you connect the SCSI cables to the
shared storage.
Configuring and Managing Virtual Disks
The hard drives in the shared storage system must be configured for clustering. Before you configure the virtual disks,
configure the RAID levels that you will be using in your cluster. See the PERC documentation and the Array Manager
documentation for instructions about setting up a RAID array.
All virtual disks, especially if they are used for the quorum resource, should incorporate the appropriate RAID level to ensure
high availability. See " Creating the Quorum Resource " for more information on the quorum resource.
NOTE: Dell recommends that you use a RAID level other than RAID 0 (which is commonly called striping). RAID 0
configurations provide very high performance, but do not provide the necessary redundancy that is required for the
quorum resource. See the documentation for your storage system for more information about setting up RAID levels
for the system.
In a cluster configuration, if multiple NTFS partitions are created on a single virtual disk, these partitions will fail over
together. If you plan to run cluster-aware applications on each cluster node, you must create at least two separate virtual
disks to ensure that the applications can fail over independently.
Obtaining More Information
See " Naming and Formatting Drives on the Shared Storage System " for information on how to assign drives letters to the
shared hard drives in a cluster installation.
See the appropriate operating system documentation and the PERC documentation for instructions on partitioning and
formatting the shared storage system's hard drives.
Windows Storage Server 2003, Enterprise Edition Dynamic Disks and
Volumes
The Windows operating system does not support dynamic disks or volumes as shared cluster storage. If the shared cluster
storage is configured as a dynamic disk, the Cluster Configuration wizard will not be able to discover the disks, which
prevents the cluster and network clients from accessing the disks.
Naming and Formatting Drives on the Shared Storage System