HP XP External Storage Software - Manual (Page 44)

To keep the load proper, HP recommends the following:
◦ Define volumes of each AMS 2000 series storage system to set the external path number
to two. In that case, set the paths to the ports of each controller of the AMS 2000 series
storage system.
◦ Set the queue of commands that are issued at the same time from one AMS 2000 series
storage system to 500 or less. The formula to calculate the number of the queue commands
per AMS 2000 series storage system is shown as follows:
(number of queues) x (number of paths of external volumes) x (number of external volumes
that issue commands at the same time) < 500
For more information about setting the queue of commands, see “Change WWN
Parameter Dialog Box” (page 97) .
•
When you use external volumes of the AMS 2000 series storage system with the program
product for copying, the copy operation needs to be distributed to two or more RAID groups.
There is an upper bound to the number of pairs that can be used for an initial copy or
resynchronization. Therefore, the copy operation might focus on a specific RAID group
according to the order of the copy operation when the copy operation is performed to two
or more external volumes. The drive of the AMS 2000 series storage system might become a
bottleneck, which causes insufficient performance, when the copy operation focuses on a
specific RAID group.
Installing and Uninstalling XP External Storage
This section explains how to install and uninstall XP External Storage.
Installing XP External Storage
You need to install XP External Storage using the license key to perform the XP External Storage
operations on the Remote Web Console computer.
To install the XP External Storage license key:
1. Start the Remote Web Console for the desired storage system.
2. Enable the XP External Storage options on the Remote Web Console computer and on each
storage system.
For detailed instructions, see the HP StorageWorks XP24000/XP20000 Remote Web Console
User Guide.
Uninstalling XP External Storage
To uninstall XP External Storage, you must remove all the pairs and then delete the external volume
mapping.
To uninstall XP External Storage:
1. Start Remote Web Console, and open the Remote Web Console main window.
For instructions, see the HP StorageWorks XP24000/XP20000 Remote Web Console User
Guide.
2. Delete external volume mapping (see “Deleting the External Volume Mapping (Delete Volume
Command)” (page 99) ).
3. Disable the XP External Storage option on the Remote Web Console computer and on each
storage system.
For detailed information about the uninstallation procedure, see the HP StorageWorks
XP24000/XP20000 Remote Web Console User Guide.
44 Preparing for XP External Storage Operations