HP P4000 9.0 HP StorageWorks P4000 SAN Solution User Guide - Page 269
Monitoring performance, Prerequisites, Introduction to using performance information
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17 Monitoring performance The Performance Monitor provides performance statistics for iSCSI and storage system I/Os to help you and HP support and engineering staff understand the load that the SAN is servicing. The Performance Monitor presents real-time performance data in both tabular and graphical form as an integrated feature in the CMC. The CMC can also log the data for short periods of time (hours or days) to get a longer view of activity. The data will also be available via SNMP, so you can integrate with your current environment or archive the data for capacity planning. See "Setting up SNMP" on page 130. As a real-time performance monitor, this feature helps you understand the current load on the SAN to provide additional data to support decisions on issues such as the following: • Configuration options (Would network bonding help me?) • Capacity expansion (Should I add more storage systems?) • Data placement (Should this volume be on my SATA or SAS cluster?). The performance data does not directly provide answers, but will let you analyze what is happening and provide support for these types of decisions. These performance statistics are available on a cluster, volume, and storage system basis, letting you look at the workload on a specific volume and providing data like throughput, average I/O size, read/write mix, and number of outstanding I/Os. Having this data helps you better understand what performance you should expect in a given configuration. Storage system performance data will allow you to easily isolate, for example, a specific storage system with higher latencies than the other storage systems in the cluster. Prerequisites • You must have a cluster with one or more storage systems and one or more volumes connected via iSCSI sessions. • All storage systems in the management group must have SAN/iQ software version 8.0 or later installed. The management group version on the Registration tab must show 8.0. • A server must be accessing a volume to read data, write data, or both. Introduction to using performance information The Performance Monitor can monitor dozens of statistics related to each cluster. The following sections offer some ideas about the statistics that are available to help you manage your SAN effectively. These sections cover just a few examples of common questions and issues, but they are not an exhaustive discussion of the possibilities the Performance Monitor offers. For general concepts related to performance monitoring and analysis, see "Performance monitoring and analysis concepts" on page 281. P4000 SAN Solution user guide 269