J06.07 Release Version Update Compendium

2 Operating System
Increased Capacity and Resource Monitoring for the Open System Services
(OSS) Environment
This RVU introduces new limits for the Open System Services file system. These new limits are
approximately four to six times higher than the previous limits. For example:
• The maximum number of OSS file opens per processor, previously 12,000, has been raised
to 64,000.
• The maximum number of pipes per processor, previously 1024, has been raised to 16,000.
• The maximum number of AF_INET sockets per processor, previously 4,095, has been raised
to 16,000.
• The maximum number of AF_UNIX sockets per processor, previously 4,095, has been raised
to 16,000.
• The maximum number of disk opens per processor, previously 12,000, has been raised to
48,000.
• The maximum number of terminal opens per processor, previously 4,095, has been raised
to 16,000.
This RVU also introduces EMS events (operator messages) that allow you to monitor OSS file
system resource usage. For each type of resource, limit warning events occur when resource
usage exceeds 85% of the resource limit and are repeated hourly until resource usage drops
below 65% of the resource limit. Error events occur when resource exhaustion occurs.
For more information about these features, see the Open System Services Management and Operations
Guide.
Increased DP2 Lock Limits
The DP2 MAXLOCKSPERTCB and MAXLOCKSPEROCB attributes now accept values in the
range 0 through 1,000,000. You specify these values through the Subsystem Control Facility (SCF)
for the Disk Subsystem.
Increased Capacity and Resource Monitoring for the Open System Services (OSS) Environment 13