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RMF Reports |
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RMF Link Statistic Reports Abstract This technote provides information on how to create different RMF link statistic reports of I/O Rate and throughput for fibre channel ports of the Enterprise Storage Server on z/OS systems. You can easily extract exception conditions and peak values over a longer time period. The statistics are provided for ESS ports that are SAN attached or direct attached to fibre channel servers as well as for PPRC link traffic. For related information about this topic, refer to the following IBM Redbooks publication: IBM TotalStorage Enterprise Storage Server Implementing ESS Copy Services with IBM eServer zSeries, SG24-5680-04 Content With ESS LIC version 2.3.x or higher and APAR OA04877 for RMF, new performance statistics of the Enterprise Storage Server for FC PPRC adapters or servers connected with FC adapters can be collected and reported. The reports may be used for the analysis of the external link usage and for performance planning of PPRC and XRC. Currently there is no support available for ESCON adapters. These link statistics are saved in a new subtype 8 of SMF record 74. The RMF Postprocessor is enhanced by a new ESS Link Statistics report. RMF Monitor I options To enable or disable the gathering of the RMF Monitor I, simply specify ESS / NOESS in the PARMLIB options member for RMF. NOESS is the default. ESS specifies that Enterprise Storage Server link statistics should be collected. As ESS data gathering involves cache activity measurement, it is recommended to specify ESS andCACHE options. If ESS and NOCACHE is specified, cache data gathering is performed implicitly without writing SMF 74 subtype 5 records. Options CACHE and ESS can be specified on any system sharing the selected devices in a Sysplex. Therefore specify options ESS and CACHE together on one selected system to avoid duplicate data gathering.RMF Postprocessor Report for link statistics The syntax of the reports and the values for the exception conditions are described in z/OS V1R5.0 Resource Measurement Facility User's Guide SC33-7990. To produce this report, specify the REPORTS(ESS) option in the Postprocessor job. This report contains statistics about the I/O operations for each adapter of an ESS.This example shows the throughput of two PPRC links and two adapters connected to server HBAs.  This ESS Link Report provides information for all FC adapters that have activities in the report interval. The report shows two outgoing PPRC links with 5 MB/s data rate during the time interval of 5 minutes and an average I/O rate of 183 I/Os and 262KB I/O block size. The Response Time per Operation is the entire time from sending out a data block until the return receipt of the receiver arrives. On a Fibre Channel, multiple data blocks can be sent in sequence regardless of the return receipts of previous blocks. Therefore the Number of Operations per Second times the Response Time per Operation can be more than 1000 ms per second. This value is called IO Intensity of the adapter and is displayed in the right column.RMF Exception report and Overview report If you need to find workload exception conditions of your PPRC links, in order to analyze performance behavior or to obtain the peak write workload, you can use the RMF EXCEPTION report to search a wide time range of your RMF data. Use the IFASMFDP dump program to extract the SMF record 78 subtype 8 from stored long term data and run the Exception report on the extracted data set. The OVERVIEW report shows the values of all selected adapters for intervals that meet the condition used. The syntax of RMF and the detailed description of the exception conditions is available in the z/OS V1R5.0 Resource Measurement Facility User's Guide,SC33-7990. These new conditions are provided on an ESS adapter level. You need to specify an ESS serial number and an adapter ID as qualifier, for example:SAID002C - a user specified name of the condition ESRTPSD - the condition name - PPRC send transfer rate in this case SERN - the ESS serial number SAID - the System Adapter Identifier of the ESS adapter Control statements:
OVW(SAID002C(ESTRPSD(SERN(0000023953),SAID(02C)))) OVW(SAID008C(ESTRPSD(SERN(0000023953),SAID(08C)))) OVW(SAID0024(ESRTSWR(SERN(0000023953),SAID(024)))) OVW(SAID0084(ESRTSWR(SERN(0000023953),SAID(084)))) This example below presents the throughput for two PRRC links and two Host connected ports in intervals of one minute.
Control statements for the EXCEPTION report: EXCEPT(SAID0024(ESTRSWR(SERN(0000023953),SAID(0024)),GE,4000000)) EXCEPT(SAID008C(ESTRPSD(SERN(0000023953),SAID(008C)),GE,8000000)) The Exception report example below only shows you the time intervals when PPRC throughput at the ESS adapter SAID 0024 is greater than 4 MB/s and FC throughput at the ESS adapter SAID 008C (Server Adapter) is more than 8MB/s. So you can quickly find out if your configuration has reached its limits.
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