System Commands Compatibility; Shelf Firmware Ndu; Types Of Shelf Controller Module Firmware Ndus Supported - IBM N Series Hardware Manual

System and firmware NDU support for stretch MetroCluster
Both minor and major version NDU is supported in a stretch MetroCluster environment.
Stretch MetroCluster is essentially an HA pair configuration, so the same limits and
qualifications apply.
System and firmware NDU support for fabric MetroCluster
Minor version NDU is supported for fabric MetroCluster environments.
Major version NDU for fabric MetroCluster is supported from Data ONTAP 7.2.4 (and later) to
Data ONTAP (7.3.2) and later.

20.1.7 System commands compatibility

cf takeover -f cannot be used across minor releases. The download process requires a
clean shutdown of the storage controller for the new kernel image to be installed correctly. If
the shutdown is not clean, the system reboots with the old kernel image.
cf takeover -n also cannot be used across minor releases, The cf takeover -n command
applies only to major version NDU. It fails if attempted during a minor NDU or normal
takeover.
cf giveback -f can be used during system NDU. Running this command might be necessary
when long-running operations or operations that cannot be restarted are running on behalf of
the partner.

20.2 Shelf firmware NDU

The IBM N series disk shelves incorporate controller modules that support firmware upgrades
as a means of providing greater stability or functionality. Because of the need for
uninterrupted data I/O access by clients, these firmware updates can, depending on the
model of module involved, be performed nondisruptively.
The N series storage controllers, with integrated SAS disk drives, employ internal SAS
expander modules that are analogous to controller modules on stand-alone shelves. At the
time of writing, these controllers include the N3300, N3600, and N3400 series controllers.

20.2.1 Types of shelf controller module firmware NDUs supported

Shelf controller module firmware NDU is supported or not supported as shown in Table 20-5.
Table 20-5 Shelf firmware NDU support
Shelf module
ESH/ESH2/ESH4
AT-FC/AT-FC2
AT-FCX
N3000
IOM3 (EXN3000)
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IBM System Storage N series Hardware Guide
NDU supported?
Yes
No
a
Yes
b
Yes
Yes