Buffer Pools attributes (z/OS systems only)

Use the Buffer Pools attributes for detecting performance problems within buffer pools. This attribute group provides buffer manager performance statistics for buffer pools that belong to a queue manager on a z/OS system. For example, you can create a situation to detect low buffer availability within a pool. Buffer Pools is a multiple-instance attribute group. You cannot mix these attributes with attributes of any other multiple-instance group.

The Buffer Pools attributes are available on z/OS systems only.

% of Bufrs Available The lowest percentage of available buffers across all buffer pools that belong to this queue manager. The valid format is a decimal (formatted to 1 decimal place) with a range from 0.0 - 100.0.

% GetPg Outside Pool The percentage of get-page requests that are not resolved from the buffer pool. The valid format is a decimal (formatted to 1 decimal place) with a range from 0.0 - 100.0.

% Updated Pgs Written The percentage of updated buffer pages that are written to page data sets on disk. The valid format is a decimal (formatted to 1 decimal place) with a range from 0.0 - 100.0.

Asynch Writes Processing Started The number of times that the asynchronous write processor needs to be started because fewer than 15% of the buffers are available. The valid format is an integer.

Available Buffers The number of available buffers in this buffer pool. The valid format is an integer.

DASD Page Reads/Sec The rate at which the buffer manager is reading buffer pages from page data sets on disk. The valid format is a decimal (formatted to 1 decimal place).

DASD Page Writes/Sec The rate at which the buffer manager is writing buffer pages to page data sets on disk. The valid format is a decimal (formatted to 1 decimal place).

GetPg IO % The percentage of get-page requests that result in I/O. Valid format is a decimal (formatted to 1 decimal place) with a range from 0.0 - 100.0.

Hash Chain Changes Changes of the hash chain. The valid format is an integer. Informational only.

Host Name The name of the system on which this queue manager is running. On z/OS systems, this is the SMF ID. The valid format is an alphanumeric string of up to 48 case-sensitive characters.

Interval Time The size of the current sampling interval, in hundredths of seconds. For example, .50 is half a second. This value is determined by the control parameters that are set when configuring the IBM MQ Monitoring agent; it is usually specified as 60.00 (60 seconds). Valid format is a decimal (formatted to 2 decimal places).

Low Buffer Synch Writes The number of times that pages are written out synchronously. The valid format is an integer.

Low # Avail The lowest number of available buffers across all buffer pools that belong to this queue manager. The valid format is an integer.

Number Buffers The number of buffers in this buffer pool. The valid format is an integer.

Origin Node The IBM MQ Monitoring agent-assigned name of the node on which the data for the queue manager originates.

On z/OS systems, this name takes the form qmgr:smfid:MQESA, where qmgr is the name of the queue manager and smfid is the z/OS system ID or SMF ID.

Page Sets Assigned The number of page sets that are assigned to this buffer pool. The valid format is an integer.

Pool ID The number of the current buffer pool (a 2-digit integer of 00, 01, 02, or 03).

QMgr Name The name that is assigned to this queue manager. The valid format is an alphanumeric string of up to 48 case-sensitive characters.

Queues Assigned The number of monitored queues assigned to page sets that are assigned to this buffer pool. Valid format is an integer.

Sample Date & Time The date and time of the sample. The valid format is the standard 16-character date/time format (CYYMMDDHHMMSSmmm), where the strings have the following meanings:

C
Century (0 for 20th, 1 for 21st)
YY
Year
MM
Month
DD
Day
HH
Hour
MM
Minute
SS
Second
mmm
Millisecond

Synch Wrt % Percentage of synchronous writes. The valid format is a decimal (formatted to 1 decimal place) with a range from 0.0 - 100.0. Informational only.

Updated Pgs/Wrt The average number of updated buffer pages that are written each time buffer pages are stored on disk. The valid format is a decimal (formatted to 1 decimal place).

Zero Bufrs Count The number of times that no buffers are available to satisfy a request for a page. The valid format is an integer.