User`s guide

104 007-4403-003

8: Troubleshooting

Crash: Semaphore Limit Exceeded

If vvtr crashes, you might have exceeded the number of conﬁgured pollable

semaphores. The log would appear as follows:

C 06-14:29:23.348170 1386 Failed opening semaphore file descriptor

(sems open=147): No space left on device

A 06-14:29:23.348985 1386 FATAL SYSTEM ERROR:

SYSTEM CONFIGURATION ERROR

To ﬁx the problem, follow these steps:

1. Edit the ﬁle /var/sysgen/master.d/usema and increase USMAXDEVS, for

example, to 1050.

2. Rebuild the kernel (autoconfig) and reboot the system to activate the change.

Conﬁguring to Boot From a Backup Plex

The system normally boots from the primary root plex, that is, root.data.0.0. If the

primary plex becomes unavailable, you can either label the disks and swap master and

slave, or you can use the following procedure to set up the system so that it can boot from

the secondary root plex, for example, system.data.1.0.

1. Ensure that sash (the standalone shell) is installed in the volume header of the

secondary plex.

2. From the System Maintenance Menu, choose Enter Command Monitor (5).

3. Display the PROM environment variables:

>> printenv

SystemPartition=dksc(0,1,8)

OSLoadPartition=dksc(0,1,0)

root=dks0d1s0

...

The swap PROM environment variable (which is set below) is not displayed because

it is not saved in NVRAM.