HP XP7 Storage - Manual (Page 127)

Monitoring capacity and performance
Monitoring pool capacity
The storage system monitors the pool’s free capacity in accordance with threshold values defined
when you create pools. If the pool capacity reaches the threshold values, warnings are issued as
SIMs and as SNMP traps to the open-systems host. See
“Monitoring pool usage levels” (page 127)
for more information.
You can provision a larger virtual capacity beyond the pool capacity by using THP V-VOLs of Thin
Provisioning Z. However, when the pool’s free capacity is depleted, you can lose access to THP
V-VOLs that require more pool capacity. For example, if the pool usage rate is 100% due to
increased write operations, then I/O is not accepted and I/O will be stopped for a THP V-VOL
that failed to receive needed pool capacity. Therefore, you should carefully monitor the pool usage
or pool free capacity, as well as the level of provisioned virtual capacity.
Monitoring pool usage levels
Several tools are available that show both the current pool usage rates and the changes over time
for those usage rates. These tools help you monitor the pool free space and estimate when you
will need to increase the pool capacity by adding pool volumes.
In Remote Web Console the Pool window, use the Virtual Volumes tab to view THP V-VOL usage
rates and pool usage rates (see
“Pools window” (page 257) and ( “Pools: Volume tabs” (page 262) .
In Remote Web Console, you can monitor THP V-VOL usage and pool usages rates using the
time-variable graph.
Monitoring performance
You can monitor system performance using Performance Monitor. For more information, see the
HP XP7 Performance for Open and Mainframe Systems User Guide.
You can monitor information on pools and THP V-VOLs using RAID Manager. For more information,
see the HP XP7 RAID Manager User Guide.
The following activities help you to monitor and control performance of the THP V-VOL. Collecting
monitor information and subsequent tuning may increase throughput and the operating rates.
•
Collecting monitor information. Collecting the following monitor information helps you determine
the pool load (including the access frequency, the trend of pool usage rates, and the access
load upon data drives) and THP V-VOL load (including the access frequency and the trend of
pool allocation rates). You can then use this monitor information to tune the appropriate
allocation.
◦ Access frequency of THP V-VOL, read hit rates, and write hit rates (using Performance
Monitor)
◦ Usage rates of property groups of pools (using Performance Monitor)
◦ Pool usage and elapsed time of pool usage (using Remote Web Console).
Monitoring capacity and performance 127