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many routine maintenance scenarios, and should always be avoided. Fortunately,
very few device drivers still behave this way, and these are expected to be updated
as well.
Q: Must I schedule downtime for my SAN to perform the PID update?
A: Generally, no. Provided that you have dual-fabrics and are certain that no
devices in your SAN bind by PID, the update process is simple and
user-transparent. It is necessary to spend some effort to ensure this before
attempting an online update, and if the effort is less attractive than the downtime,
you may prefer to schedule an outage.
Q: Must I stop all traffic on the SAN before performing the update?
A: If you are running dual-fabrics with multi-pathing software, you can update
one fabric at a time. Move all traffic onto one fabric in the SAN, update the other
fabric, move the traffic onto the updated fabric, and update the final fabric.
Without dual-fabrics, stopping traffic is highly recommended. This is the case for
many routine maintenance situations, so dual-fabrics are always recommended for
uptime-sensitive environments.
Q: How can I avoid having to change PID formats on fabrics in the future?
A: The core PID format can be proactively set on a fabric at initial installation.
The update could also be opportunistically combined with any scheduled outage.
Setting the format proactively far in advance of adoption of higher port count
switches is the best way to ensure administrative ease.
Q: Where can I get more information on upgrading to larger switches?
A: Refer to the SAN Design Guide and HP support.
Detailed Procedures
These procedures are not intended to be comprehensive. They provide a starting
point from which a SAN administrator could develop a site-specific procedure for
a device that binds automatically by PID, and cannot be rebooted due to uptime
requirements.
HP/UX
1. Back up all data. Verify backups.
2. If you are not using multipathing software, stop all I/O going to all volumes
Core Switch 2/64 V4.1 Installation Guide
connected through the switch/fabric to be updated.
Technical Specifications
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