IBM RELEASE 7.3 - Manual (Page 107)

Table 1. IRIX System Parameters
Parameter Name Minimum Value Parameter Description
semmsl 512 Maximum number of semaphores per set
maxdmasz 513 Maximum DMA size (required for Ampex
DST support)
Solaris
Solaris system parameters which affect the remote Mover can be modified by editing the /etc/system
configuration file and rebooting the system. The following table defines the parameter names and
minimum required values.
Note that the semmns and semmnu values should be increased if running more than one Mover on the
Solaris machine (multiply the minimum value by the number of Movers to be run on that machine).
Table 2. Solaris System Parameters
Parameter Name Minimum Value Parameter Description
semsys:seminfo_semmns 1024 Maximum number of semaphores in system
semsys:seminfo_semmnu 512 Maximum number of undo structures in system
semsys:seminfo_semmsl 512 Maximum number of semaphores per set
shmsys:shminfo_shmmax 8388608 Maximum shared memory segment size (will
allow up to a 2MB Mover buffer size)
Linux
Linux system parameters which affect the remote Mover are detailed in the following table and can be
modified as follows.
To temporarily change SEMMSL and SHMMAX, use the sysctl(8) commands as shown in the example
below (the values take effect immediately, but will not be preserved across reboots).
% /sbin/sysctl -w kernel.sem="512 32000 32 128"
% /sbin/sysctl -w kernel.shmmax="33554432"
Where "512 32000 32 128" are the values for SEMMSL, SEMMNS, SEMOPM, and SEMNI
respectively (only change SEMMSL).
To make the changes permanent (across reboots), edit sysctl.conf(5) and add the following lines
(preserving spaces).
# Increase SEMMSL and SHMMAX for HPSS Mover
kernel.sem = 512 32000 32 128
kernel.shmmax = 33554432
Note that the minimum SEMMSL value in the following table should be multiplied by the number of
Movers running on the Linux machine.
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 107