IBM N Series, Implementation Manual

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76 Common problems
Common problems
The following table shows how to resolve some common problems with a
gateway that uses native disk shelves.
Problem Explanation and solution
You are not aware that Data
ONTAP automatically assigns new
disks to a system by default. If you do not want the gateway to take
ownership of the disks immediately,
disable automatic disk assignment
through the
disk.auto_assign
option.
Note
Disk autoassignment does not apply to
array LUNs. You must explicitly assign
array LUNs to your system.
Not all disks are visible.
◆
Verify that the cables are plugged
in.
◆
Verify that the disk modules are
properly seated.
◆
Verify that there is not a mismatch
between the disk shelf and
components in the same loop.
For example, if the disk drives are
limited to 2 Gb and you set the
ESH4 module to 4 Gb, the port
comes online but the gateway
cannot see the disks.
There is a loop speed mismatch
between components on the same
loop. The Gb-loop speed for all components
in the loop must be set to the lowest of
any component in the loop. Be sure that
you confirm the speed of
all
components in the loop—including the
disk shelves. See the guide for your
disk shelf model for information about
the characteristics of your disk shelf.