Measure Reference Manual
IO-QLEN-MAX
(Legacy Style only) Maximum number of outstanding I/Os on the queue described by the IO-QTIME
counter.
Counter type: Max queue.
READ-QLEN-MAX
(Legacy Style only) Maximum number of requests on the read request queue since the counter
record was allocated.
Counter type: Max queue.
SERVER-QLEN-MAX
(Legacy Style only) Maximum number of items on the queue described by the SERVER-QTIME
counter. This counter applies only to IPC and RIPC records.
In H-series and J-series RVUs, this counter has a value of 1.
Counter type: Max queue.
WRITE-QLEN-MAX
(Legacy Style only) Maximum number of requests on the write request queue since the counter was
allocated.
Counter type: Max queue.
Usage Notes for SERVERNET Entities
• The SERVERNET entity provides a view of all ServerNet operations across a system. When
several devices share a SAC, the SERVERNET entity measures combined activity.
• SUBSYSTEM-VERSION for ZMSSVNET records is provided by the specific subsystem represented
by the node^class of the record:
◦ For CLIM node classes, the CIP (Cluster I/O Protocols) subsystem
◦ For IPC and RIPC, the message system
◦ For SCSI and COLO, the SCSI module driver
◦ For NIOC, the SLSA module driver
• Some overlap exists between the SERVERNET entity and the device entity types (DEVICE, DISK,
and so on) in cases where a single device is connected to a single controller.
• For storage SACs such as MFIOB devices, the IO-QBUSY-TIME counter is the most accurate
indicator of busy time and service time for each request. The READ-QBUSY-TIME and
WRITE-QBUSY-TIME counters provide similar data, but these two counters are somewhat less
accurate in the ServerNet environment due to request queuing.
Usage Notes for ServerNet IPC and RIPC
• Interprocessor communications (IPC) activity is measured partially in the initiating processor
(called the linker) and partially in the receiving or replying processor (called the listener). In
each processor, one SERVERNET record tracks the linker activity with another processor, and
a second SERVERNET record tracks listener activity. The Measure performance monitor
generates this identifier in the SAC Name field for IPC SERVERNET records:
IPC-CPUxx-TO-CPUyy
332 Entities and Counters