HP StorageWorks Enterprise Virtual Array 3000/5000 updating product software guide (VCS 3.110) (5697-7959, February 2009)

3. When the command has completed, open the file in an ASCII editor. Identify any instances where
the IOPS and throughput lim its have be en exceeded. If the limits have not been exc ee ded, this
may be a good period to p erform the upgrade.
NOTE:
Another option for displaying HP Command View EVAPerf data is to use the -csv
command option, which saves the data as comma separated values for importing into a
spreadsheet. This may be useful for analyzing large amounts of data.
Identifying virtual disk activity
If you cannot locate a period that meets the necessary I/O load requirements, it may be possible to
identify specific applications that are imposing heavy I/O loads, and suspend them long enough to
perform the upgrade. This can be done by using HP Command View EVAPerf to view virtual d isk activity.
For example, a fter running HP Command View EVAPerf, you determine that all the virtual disks on the
storage system are nearly idle with the exception of one virtu al disk. To perform an online upgrade, it
may be desirable to halt the application that is imposing the load on the busy virtual disk. This will be far
less disruptive to your environment than performing an offline upgrade.
T o view virtual disk activity:
1. Double-click the HP Command View EVAPerf program icon on the desktop. The HP Command View
EVAPerf command window opens.
2. Enter the following command to display virtual d isk activity:
evaperf vd –cont n –dur n –sz array -fo filename
Select an appropriate interval and duration that will enable you to view a period d uring which
you may want to perform the upgrade. For example, the following command will capture data at
15 second inter vals for 2 hours on an array nam ed EVA1 and store the output in a file named
virtua l_disks:
evaperf vd -cont 15 -dur 7200 -sz EVA1 -fo C:\virtual_disks
3. When the command has completed, open the file in an ASCII e ditor. The virtual disk information will
appear similar to that in Figure 9.
Activity is reported separately for each controller accessing a virtual disk. The total activity for
each virtual disk is the sum of the reported a ctivity for each controller. A virtual disk may also be
a snapshot, snapclone, or a DR group member. In the output, logical unit number (LUN) is used
interchangeably with virtual disk.
Virtual disks must be presented to a host to be seen by HP Command View EVAPerf. However,
replication volumes on the replication system are visible without being presented.
Because the storage system controllers are active/active, one controller is preferred (the owning
controller) but requests can still be p rocessed by the other controller (the p roxy controller). In
active/active c ontrollers, all host requests are logged by the receiving c ontroller only, whether owning
or proxy. Thus, all request rate and data rate activity for a virtual disk is the sum of both controllers.
The statistics you shou ld use to determine the virtual disk activity are listed in Table 5.
HP StorageWorks Enterprise Virtual Array 3000/5000 updating product software guide (VCS 3.110)
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