HP Fabric Clustering System Release Notes, May 2004

HP Fabric Clustering System
Known Problems and Issues
6
Known Problems and Issues
HP Fabric Clustering System HCA and OL*
None of the On-Line Add or Replace (OL*) features are currently supported for the HP Fabric Clustering
System HCA.
Reset of an HCA
Before using the itutil -R command to reset an HCA, be sure to kill all applications in the fabric, or a panic
may occur.
Limit on Multicast Groups
Neither of the following restrictions apply to switchless IB fabrics.
Restrictions for IB subnets with hosts using IPv4 only:
Applications using IPv4 multicast will be limited to 30 distinct multicast groups for the entire subnet.
Restrictions for IB subnets with hosts using IPv4 and IPv6:
In such configurations, 28 distinct multicast groups are available for the entire IB subnet. Each IPv6
interface will consume 1 unique multicast group. Any remaining multicast groups can be used by
applications.
Applications Using MPI
Applications that use the Message Passing Interface (MPI) must belong to a group for which the privileges
include MLOCK. If an application uses MPI, you must change its group’s privilege to MLOCK each time the
system is rebooted.
To do this, log in as root and issue this command:
/usr/bin/setprivgrp group_name MLOCK
NOTE The setprivgrp command is not MP safe.
Next, ensure that the group’s privileges contain MLOCK, by issuing this command:
/usr/bin/getprivgrp group_name
If you do not set the group’s privilege to include MLOCK, the application will fail in the function
it_evd_create() with the error IT_ERR_RESOURCES (77).
For more information about MPI, see the document titled HP MPI Version 2.0.1 for HP-UX, Release Note.
Interaction with HyperFabric Driver
The HP Fabric Clustering System driver will not co-exist with HyperFabric driver versions prior to
B.11.23.01. The HyperFabric driver versions must be upgraded to version B.11.23.01 before installing the HP
Fabric Clustering System driver. Failure to upgrade the HyperFabric driver to version B.11.23.01 will result
in a system panic if HP Fabric Clustering System or HyperFabric commands are issued.