IBM N Series, Руководство по внедрению

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26 Guidelines for gateway port usage
Guidelines for gateway port usage
Setting required for
HBAs All gateway HBAs that are used to access disks or array LUNs must be set to
initiator ports. The factory might configure some HBAs as target ports.
Therefore, when you set up your system you need to check the HBA settings and,
if necessary, change a target HBA setting to an initiator. See Appendix A,
“
Configuring Gateway Ports as Initiators ,” on page 63 for information about how
to check the setting of the HBAs and change them if necessary.
Number of ports
required to connect
to a storage array The gateway requires two paths to each array LUN. Use two redundant initiator
ports on the gateway to access each LUN group on the storage array.
Number of ports
required to connect
to a disk shelf You need to use the following number of ports to connect the gateway to a disk
shelf:
For a stand-alone system:
◆
If you are using one loop, use one FC initiator port
◆
If you are connecting two loops, use two FC initiator ports, one for each
loop.
For an HA pair:
◆
If you are using Multipath Storage, use two FC initiator ports for each loop
◆
If you are not using Multipath Storage, use one FC initiator port for each
controller for each loop in the configuration.
Restrictions for
sharing initiator
ports Use a separate gateway initiator port to connect each of the following:
◆
disk shelves
◆
array LUNs
◆
tape devices
If your gateway model does not have enough internal ports for your needs, you
must order an additional HBA.