Setting Up Luns; Lun Overview; Initiator Group Overview - IBM N Series Hardware Manual
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On systems that use Fibre Channel, the Host Utilities installer sets the required timeout
values for Emulex and QLogic Fibre Channel HBAs. If Data ONTAP DSM for Windows MPIO
is detected on the host, the Host Utilities installer does not set any HBA values.
17.5 Setting up LUNs
LUNs are the basic unit of storage in a SAN configuration. The host system uses LUNs as
virtual disks.
17.5.1 LUN overview
You can use a LUN the same way you use local disks on the host.
After you create the LUN, you must make it visible to the host. The LUN is then displayed on
the Windows host as a disk. You can:
Format the disk with NTFS. To do so, you must initialize the disk and create a partition.
Only basic disks are supported with the native OS stack.
Use the disk as a raw device. To do so, you must leave the disk offline. Do not initialize or
format the disk.
Configure automatic start services or applications that access the LUNs. You must
configure these start services so that they are dependent on the Microsoft iSCSI Initiator
service.
You can create LUNs manually, or by running the SnapDrive or System Manager software.
You can access the LUN by using either the Fibre Channel or the iSCSI protocol. The
procedure for creating LUNs is the same regardless of which protocol you use. You must
create an initiator group (igroup), create the LUN, and then map the LUN to the igroup.
Tip: If you are using the optional SnapDrive software, use SnapDrive to create LUNs and
igroups. For more information, see the documentation for your version of SnapDrive. If you
are using the optional System Manager software, see the Online Help for specific steps.
The igroup must be the correct type for the protocol. You cannot use an iSCSI igroup when
you are using the Fibre Channel protocol to access the LUN. If you want to access a LUN with
both Fibre Channel and iSCSI protocols, you must create two igroups: One Fibre Channel
and one iSCSI.
17.5.2 Initiator group overview
Initiator groups specify which hosts can access specified LUNs on the storage system. You
can create igroups manually, or use the optional SnapDrive for Windows software, which
automatically creates igroups. Initiator groups have these features:
Initiator groups (igroups) are protocol-specific.
For Fibre Channel connections, create a Fibre Channel igroup using all WWPNs for the
host.
For iSCSI connections, create an iSCSI igroup using the iSCSI node name of the host.
For systems that use both FC and iSCSI connections to the same LUN, create two
igroups: One for FC and one for iSCSI. Then map the LUN to both igroups.
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IBM System Storage N series Hardware Guide
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