Managing Serviceguard Nineteenth Edition, Reprinted June 2011

Normally disconnecting any portion of the SCSI bus will leave the SCSI bus in an unterminated
state, which will cause I/O errors for other nodes connected to that SCSI bus, so the cluster would
need to be halted before disconnecting any portion of the SCSI bus. However, it is not necessary
to bring the cluster down to do this if you are using a SCSI configuration that allows disconnection
of a portion of the SCSI bus without losing termination.
SCSI bus configurations using SCSI in-line terminators or Y cables at each node, or using a SCSI
device which auto-terminates its ports when disconnected (such as the MSA30 MI), can allow
online repair.
1. Halt the node. You can use Serviceguard Manager to do this, or use the cmhaltnode
command. Packages should fail over normally to other nodes.
2. Remove the SCSI cable from the card.
3. Remove the defective SCSI card.
4. Install the new SCSI card. The new card must be exactly the same card type, and it must be
installed in the same slot as the card you removed. You must set the SCSI ID for the new card
to be the same as the card it is replacing.
5. Attach the new SCSI card.
6. Add the node back into the cluster. You can use Serviceguard Manager to do this, or use the
cmrunnode command.
Replacing LAN or Fibre Channel Cards
If a LAN or fibre channel card fails and the card has to be replaced, you can replace it online or
offline depending on the type of hardware and operating system you are running. It is not necessary
to bring the cluster down to do this.
Offline Replacement
Follow these steps to replace an I/O card off-line.
1. Halt the node by using the cmhaltnode command.
2. Shut down the system using /usr/sbin/shutdown, then power down the system.
3. Remove the defective I/O card.
4. Install the new I/O card. The new card must be exactly the same card type, and it must be
installed in the same slot as the card you removed.
5. Power up the system.
6. If necessary, add the node back into the cluster by using the cmrunnode command. (You
can omit this step if the node is configured to join the cluster automatically.)
Online Replacement
If your system hardware supports hotswap I/O cards, you have the option of replacing the defective
I/O card online, using the HP-UX olrad command. The new card must be exactly the same card
type as the card you removed. Serviceguard will automatically recover a LAN card once it has
been replaced and reconnected to the network.
For more information, see the olrad(1m) manpage and the Interface Card OL* Support Guide
which as of the date of this manual can be found at http://h20000.www2.hp.com/bc/docs/
support/SupportManual/c01916176/c01916176.pdf. See also “Removing a LAN or VLAN
Interface from a Node” (page 287).
314 Troubleshooting Your Cluster