IBM N Series, Implementation Manual

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42 Planning for moving a disk shelf
Planning for moving a disk shelf
Types of disk
shelves that you
can move You can move any disk shelf that supports software disk ownership (SANOWN)
from an N series storage system to a gateway. (See “
Supported disk types and
disk shelves ” on page 10 for a list of disk shelves that support software disk
ownership.)
Note
You can also move disk shelves installed on a gateway to another gateway or to
an N series storage system if the destination system supports the disk shelf type.
Requirement to
upgrade to Data
ONTAP
If your existing system is running a version of Data ONTAP software prior to 7.3,
you must upgrade to at least Data ONTAP 7.3 before you move the disk shelf to
the gateway.
Loop speed
requirements If you are moving a disk shelf to an existing gateway, be sure that you understand
the characteristics of the disk shelf you plan to move—including its speed. The
output from the
sysconfig -a
command provides information about the loop
speed of the disk shelf.
Review the characteristics of the disk shelf models that are documented in the
guide for your disk shelf.
Attention
A common error in setting up disk shelves is a loop speed mismatch between
components on the same loop. The Gb-loop speed for all components—including
the disk shelves—must be set to the lowest of any component in the loop.
When there is a loop speed mismatch, an error message might be generated, the
gateway might panic, or the gateway might not be able to see the disks on the
disk shelf.