Technical data

A-8 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
Planning the Update Procedure
A
Online Update
The following steps are intended to provide SAN administrators a starting point for creating site-
specific procedures.
1. Back up all data and verify backups.
2. Verify that the multipathing software can automatically switchover between fabrics seamlessly. If
there is doubt, use the software’s administrative tools to manually disassociate or mark offline all
storage devices on the first fabric to be updated.
3. Verify that I/O continues over the other fabric.
4. Disable all switches in the fabric to be updated, one switch at a time, and verify that I/O continues
over the other fabric after each switch disable.
5. Change the PID format on each switch in the fabric.
6. Reenable the switches in the updated fabric one at a time. In a core/edge network, enable the core
switches first.
7. After the fabric has reconverged, use the cfgEnable command to update zoning.
8. Update their bindings for any devices manually bound by PID. This might involve changing them
to the new PIDs, or preferably changing to WWN binding.
For any devices automatically bound by PID, two options exist:
a. Execute a custom procedure to rebuild its device tree online. Examples are provided in the
“Converting Port Number to Area ID” on page A-12 section of this chapter.
b. Reboot the device to rebuild the device tree. Some operating systems require a special
command to do this, for example “boot –r” in Solaris.
9. For devices that do not bind by PID or have had their PID binding updated, mark online or
reassociate the disk devices with the multipathing software and resume I/O over the updated fabric.
10. Repeat with the other fabric(s).
Offline Update
The following steps are intended to provide SAN administrators a starting point for creating site-
specific procedures.
1. Schedule an outage for all devices attached to the fabric.
2. Back up all data and verify backups.
3. Shut down all hosts and storage devices attached to the fabric.
4. Disable all switches in the fabric.
5. Change the PID format on each switch in the fabric.
6. Reenable the switches in the updated fabric one at a time. In a core/edge network, enable the core
switches first.
7. After the fabric has reconverged, use the cfgEnable command to update zoning.