HP StoreVirtual 4000 Storage - Manual (Page 224)

Table 70 Performance Monitor statistics (continued)
NSM Volume or Snapshot Cluster Definition Statistic
system for the sample
interval.
X - - Percent of total
memory used on this Memory Utilization
storage system for the
sample interval.
X - - Percent of
bidirectional network Network Utilization
capacity used on this
network interface on
this storage system for
the sample interval.
X - - Bytes read from the
network for the sample
interval. Network Bytes Read
X - - Bytes written to the
network for the sample
interval. Network Bytes Write
X - - Bytes read and written
over the network for
the sample interval. Network Bytes Total
X - - Average time, in
milliseconds, for the Storage Server Total
Latency
RAID controller to
service read and write
requests.
Monitoring and comparing multiple clusters
You can open the Performance Monitor for a cluster in a separate window. This lets you monitor
and compare multiple clusters at the same time. You can open one window per cluster and rearrange
the windows to suit your needs.
1. From the Performance Monitor window, right-click anywhere, and select Open in Window.
The Performance Monitor window opens as a separate window.
Use the Performance Monitor Tasks menu to change the window settings.
2. When you no longer need the separate window, click Close.
Performance monitoring and analysis concepts
The following general concepts are related to performance monitoring and analysis.
Workloads
A workload defines a specific characterization of disk activity. These characteristics are access
type, access size, access pattern, and queue depth. Application and system workloads can be
analyzed, then described using these characteristics. Given these workload characterizations, test
tools like iometer can be used to simulate these workloads.
Access type
Disk accesses are either read or write operations. In the absence of disk or controller caching,
reads and writes operate at the same speed.
224 Monitoring performance