HP B6960-90078 manual Load Balancing, Parameters Used?, How Are Objects, Assigned to an

Backup

Using Backup Options

When to Use Load It is recommended that you use the Load Balancing option when you

Balancing want to back up a large number of objects to a number of available devices, and you would like Data Protector to keep all the devices busy all of the time. You should use Load Balancing to minimize the impact of unavailable devices on the backup. A device may become unavailable because it:

•failed during a backup

•stopped during a backup

•is in use by another session

•cannot be started at all

When Not to Use Deselecting the Load Balancing option is recommended when

Load Balancing

•you want to back up a small number of objects

•objects are backed up on simple devices, such as DDS

•you want to manually select the devices to which objects will be backed up

•you want to know on which medium/media objects will be backed up

How Are the	The Load Balancing option has MIN and MAX parameters:
Parameters Used?	MIN specifies the minimum number of backup devices out of the list of
	devices in the backup specification that can be used immediately. It
	means that they are not used by some other backup session and that you
	have enough licenses.
	MAX specifies the maximum number of devices that are used at the same
	time, even if there are more devices defined in the backup specification.
	The rest are used if needed.
	For example, assume that there are four devices in the backup
	specification and MIN and MAX are both configured at two. The backup
	session will queue until any of those two devices can be used. If any of
	them fail, one of the two devices in reserve will be used.
How Are Objects	The first device from the list of devices is started. The number of selected
Assigned to an	objects for a device is defined by its concurrency. The next device is
Available Device?	started and objects are selected until there are no more objects in the list
	or the maximum number of devices are running.
	Objects to be backed up are assigned according to the following criteria:

Chapter 5 233