iSCSI is a new service offered with NetWare 6.5. SCSI , or Small Computer System Interface , is a standard for connecting storage devices to a computer. The SCSI standard requires a specialized 50-pin connector and ribbon cable between the SCSI controller and the hard drive. Given this limitation, SCSI devices typically have to be connected directly, and in close proximity to, the computer for which they are providing disk storage.
iSCSI is an exciting new standard that makes it possible to transmit SCSI communications over a network by encapsulating them in standard TCP/IP data packets. This lets you create a low-cost Storage Area Network (SAN) using regular high-speed network hardware, and avoid the considerable costs previously associated with fiber-based SAN architectures. A SAN allows you to consolidate network storage resources for multiple NetWare 6.5 servers.
iSCSI can be configured in a variety of ways, including a nondedicated system in which the iSCSI disk array is accessed through the normal network backbone; a dedicated system in which the iSCSI disk array is accessed through a separate network dedicated to serving the needs of the iSCSI environment; and a storage router option in which the dedicated iSCSI network uses specialized iSCSI router hardware to achieve even greater performance. You can evaluate your needs and choose the iSCSI solution that makes the most sense to you.
There are two main components to the NetWare 6.5 iSCSI environment. The software necessary to use a NetWare 6.5 server is installed with the NetWare 6.5 operating system. You don't have to do any special installation routine in order to use iSCSI.
Initiator software is installed on each server that will use the shared iSCSI storage. The initiator software allows a NetWare 6.5 server or cluster to communicate with an iSCSI storage server or other iSCSI target over a normal TCP/IP network. At this time, the initiator software is only supported on NetWare 6.5.
Target software is installed on a NetWare server that will act as a disk controller for the shared iSCSI storage. A shared disk subsystem is attached directly to the NetWare 6.5 server running the target software. The target software allows external initiators to access the shared disk system.
Alternatively, a dedicated iSCSI router can be used for the target, in which case the NetWare 6.5 target software is unnecessary. The iSCSI router must comply with iSCSI Internet Draft Specification 20. A shared disk subsystem is attached directly to the iSCSI router according to the manufacturer's instructions.
Configuring the iSCSI Environment
Once you have determined the best iSCSI architecture for your needs, you are ready to configure the iSCSI environment. If you have chosen to use an iSCSI router as an iSCSI target, refer to the iSCSI storage router documentation for configuration details.
Configuring an iSCSI Target
There are three main steps to configuring NetWare 6.5 as an iSCSI target:
You can use either NoRM or the console-based NSS Management utility (NSSMU) to create the iSCSI partition on your target subsystem. To create an iSCSI partition with NoRM, complete the following steps:
Configuring iSCSI Initiators
To configure a NetWare 6.5 server as an iSCSI initiator, you must first load the initiator software on the server by entering the following at the server console:
To configure the initiator software, use NoRM to complete the following steps:
With the target and initiator configured, you can access the iSCSI disk subsystem as if it were a directly attached resource on each NetWare 6.5 server configured as an initiator for that iSCSI device. Mapping drives , trustee rights, and directory and file attributes will all work identically to a directly connected storage device.