IBM N Series, Implementation Manual

Page: 76 / 105

62 Assigning disks and array LUNs to the gateway
1
(cont)
◆
[
-c block
|
zoned
]
Checksum type can be specified only for array LUNs. The
checksum type can be either block or zoned. Block is the default
value.
Note
If you use the
all
parameter, Data ONTAP ignores any
checksum type specified. Only block checksum types are
supported for disks and the
all
parameter picks both disks and
array LUNs.
When a LUN from the storage array is mapped to be used by a
gateway, the gateway treats it as a “raw,” unformatted disk
(LUN). This “raw” array LUN needs to be formatted by the
gateway in either of two ways:
❖
Block checksum: Reserves 12.5 percent of the space in the
array LUN for checksum
❖
Zoned checksum
An array LUN of type “block” is expected to be used with block
checksum aggregates. An array LUN of type “zoned” is expected to
be used with zoned checksum aggregates. See the gateway
Installation Requirements and Reference Guide for details about and
planning for checksums.
2 Enter the following command:
disk show -v
Result: The Local System ID is shown and the disks and array
LUNs exported on the port are shown.
3 Confirm that all disks and array LUNs that you expected to be
assigned to this gateway (the local system) are shown with the ID of
this gateway.
Step Action