286 IBM System Storage N series Hardware Guide
Table 20-4 shows the maximum number of dense volumes, snapshot copies, LUNs, and
vFiler units that are supported for NDU.
Table 20-4 Maximum limits for NDU
20.1.5 Prerequisites for a system NDU
The following sections describe the tasks that must be completed before a major or minor
system NDU is performed.
Reading the latest documentation
Review the Data ONTAP Upgrade Guide for the version to which you are upgrading, not the
version from which you are upgrading. These documents are available on the IBM NAS
Support site, which is available at:
http://www.ibm.com/storage/support/nas/
Verify that the system and hosts (if applicable) fulfill the requirements for upgrade.
Review the release notes for the version of Data ONTAP to which you are upgrading. Release
notes are available on the IBM Support site.
Review the list of any known installation or upgrade problems for both the version of Data
ONTAP to which you are upgrading, and all host-specific items if your environment uses FCP
or iSCSI.
Validating the storage controller system configurations
Confirm that both storage controllers are prepared for the NDU operation. Validate each
individual controller’s configuration to identify any issues before upgrading.
Create a detailed upgrade test procedure document and a back-out plan.
Identify any inconsistencies between the two storage controllers within the HA pair controller
configuration so that all identified issues can be corrected before beginning the upgrade.
Removing all failed disks
Failed disk drives prevent giveback operations and can introduce stack and loop instability
throughout the storage system. Remove or replace all failed disk drives before beginning the
system NDU operation.
Data ONTAP Dense
volumes
Snapshot copies LUNs vFiler units
FC, SAS
storage
SATA
storage
FC, SAS
storage
SATA
storage
7.3.x to 8.0 100 500 500 2,000 64 5
7.3.x to 8.0.1 300 12,000 4,000 2,000 64 5
7.3.x to 8.1 300 12,000 4,000 2,000 64 5
8.0 to 8.0.x 300 12,000 4,000 2,000 64 5
8.0.x to 8.1 500 20,000 20,000 2,000 64 5
8.1 to 8.1.x 500 20,000 20,000 2,000 64 5
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