Zero downtime backup and HP StorageWorks Continuous Access EVA

Data Protector A.05.10 - ZDB for EVA in the CA Configuration

Snapshot policy

Strict With this option selected, Data Protector attempts to create

snapshots of the type selected by the Snapshot type option.

If some of the existing snapshots in the corresponding replica

storage pool are of a different type, the selected type of

snapshots cannot be used. Such a backup session will be

aborted.

This is the default selection.

Loose With this option selected, Data Protector creates snapshots

of a different type than specified by the Snapshot type

option when this would help to make a successful session.

For example, if you select standard snapshots to be created,

but Data Protector detects that standard snapshots cannot

be created because some vsnaps or snapclones of the source

virtual disks (in case of the source virtual disks backup) or

the destination virtual disks (in case of the destination

virtual disks backup) already exist in the replica storage

pool, the following happens: with the Loose option selected,

Data Protector creates either vsnaps (if vsnaps already exist)

or snapclones (if snapclones already exist) instead of

standard snapshots.

Note that Data Protector can use only one type of snapshots

in a backup session. For example, if some of the source

virtual disks (in case of the source virtual disks backup) or

the destination virtual disks (in case of the destination

virtual disks backup) used in the backup session have

existing standard snapshots and some of them existing

vsnaps, the backup session will be aborted.

Delay the tape backup by

a maximum of X minutes if

the snapclones are not

fully created

You can select this option if the selected snapshot type is

Snapclone.

Select this option if you want to delay moving data to tape

media until the cloning process is completed. Specify also the

maximum waiting time in minutes. After the specified

number of minutes, the backup to tape will start, even if the

cloning process is not finished yet.

With this option, you actually achieve that during the

backup data is read from the replica rather than the source

virtual disks (in case of the source virtual disks backup) or

the destination virtual disks (in case of the destination

virtual disks backup). Thus, you prevent degradation of the

application data access times during the phase of backup to

tape.