Replacing Csms - Cisco MDS 9216 Configuration Manual

Chapter 8 Upgrading CSM Software
7
7
7
7
Do you want to continue with the installation (y/n)?
If you type yes at this point, the switch upgrade will proceed. Since the software running on the nodes
Caution
2/1 and 2/2 are not compatible, after the switchover the nodes 2/1, 2/2 are shutdown. Nodes 3/1, 3/2, 7/1,
and 7/2 on the other hand will be up and running since there were no incompatibility warning messages.
Tip If the cluster spans multiple switches, we recommend that all switches run the same version of the switch
software. When upgrading switch software in a multi-switch environment, be sure to update one switch
at a time.

Replacing CSMs

When you replace the CSM, you must ensure that the new CSM is using valid nWWNs and pWWNs.
You may choose to install the new CSM in a different slot or in the same slot. The process to replace the
CSM differs based on this decision.
To avoid the need to reconfigure servers and controllers, we recommend that you configure the
Tip
replacement nodes with the same nWWNs and pWWNs as the replaced nodes. The procedure provide
in this section follows this recommendation.
Caution If nodes being replaced are given the same nWWNs or pWWNs as previous nodes that were participating
in a cluster, they must be added to same I/O group and the same cluster as the nodes being replaced.
Adding nodes with the same nWWNs or pWWNs (as the replaced nodes) to a different I/O group or
cluster, can result in data corruption. Refer to the IBM TotalStorage Subsystem Device Driver User's
Guide for more information.
If the nodes being replaced are given new nWWNs or pWWNs, then perform the following additional
steps after adding the nodes back to the cluster:
At the end of the recovery process, follow the SDD procedure to discover the new paths and to check
Step 1
that each VPath is presenting the correct number of paths. Refer to the IBM TotalStorage Subsystem
Device Driver User's Guide for more information.
You may also need to modify the configuration of your disk controllers. If your controller uses a mapping
Step 2
technique to present its RAID arrays or partitions to the cluster, you must modify the port groups that
belong to the cluster because the nWWN or pWWN's of the node have changed.
78-16119-01, Cisco MDS SAN-OS Release 1.3
svclc 1.3(1)
svcsb 1.3(1)
svcsb 1.3(1)
bios v1.0.8(08/07/03)
1.3(x)
1.3(1)
1.3(1)
v1.1.0(10/24/03)
[n] y
Cisco MDS 9000 Family SAN Volume Controller Configuration Guide

Replacing CSMs

yes
no
no
yes
8-9