8x00 Enterprise Virtual Array updating product software guide (XCS 6.200) (5697-7958, February 2009)

3. When the command has completed, open the ﬁle in an ASCII editor. I d entif y any instances where

the IOPS and throu ghp ut limits have been exce ede d. If the limits have not been excee ded, this

may be a good period to perform 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 lo a d requirements, it may be possible to

identify speciﬁc applications that are imposing heavy I/O load s, and suspend them long enough to

perform the upgrade. This can be done by using HP Command View EVAPerf to view virtual disk a ctivity.

For exa mple, after running HP Command View EVAPerf, you determine that all the virtual disks on the

storage system are ne arly idle with the exception of one virtual 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 perform ing 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 disk 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 during which

you may want to perform the upgrade. For example, the following command will capture data at

15 second intervals for 2 h ours on an array named EVA 1 and store the output in a ﬁ le named

virtu a l_disk s:

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 7.

Activity is reported separately for each controller accessing a virtual disk. The total activity for

each virtual disk is the sum of the reported activity for e ach 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 Vie w EVAPerf. However,

replication volumes on the re plication 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 processed by the other controller (the proxy controller). In

active/active controllers, all host requests are logged by the receiving controller only, whether owning

or proxy. Thus, all re quest rate and data rate activity for a virtual disk is the s um of both controllers.

The statistics you should use to determine the virtual disk activity are listed in Table 6.

HP Stora g eWorks 4x00/6x00/8x0 0 Enterprise Virtual Array updating product software guide (XCS 6.200)