Offline update, Hybrid update – HP Brocade 4Gb SAN Switch for HP BladeSystem p-Class User Manual
Page 210
210 Configuring the PID format
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 may 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
” on page 213 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.
8.
Bring the devices online in the order appropriate to the SAN. This usually involves starting up the
storage arrays first, and the hosts last.
9.
For any devices manually bound by PID, bring the device back online, but do not start applications.
Update their bindings and reboot again if necessary. This may involve changing them to the new PIDs,
or may (preferably) involve changing to WWN binding.
10.
For any devices automatically bound by PID, reboot the device to rebuild the device tree (some
operating systems require a special command to do this, such as
boot –r
in Solaris).
11.
For devices that do not bind by PID or have had their PID binding updated, bring them back up and
resume I/O.
12.
Verify that all I/O has resumed correctly.
Hybrid update
It is possible to combine the online and offline methods for fabrics where only a few devices bind by PID.
Because any hybrid procedure is extremely customized, it is necessary to work closely with the SAN
service provider in these cases.