Dell PowerVault DP600 - Manual (Page 43)

43
How Important Is the Protection Group
Membership Decision?
Protection group members cannot be moved between protection groups. If you decide later that a
protection group member needs to be in a different protection group, you must remove the
member from its protection group and then add it to a different protection group.
If you determine that the members of a protection group no longer require protection, you can
stop protection of the protection group. When you stop protection, your options are to retain
protected data or to delete protected data.
• Retain protected data option: Retains the replica on disk with associated recovery points
and tapes for the specified retention range.
• Delete protected data option: Deletes the replica on disk and expires data on the tapes.
See Also
Planning Protection Configurations
Selecting a Data Protection Method
Data Protection Manager (DPM) 2007 offers the following data protection methods: disk-based
(D2D), tape-based (D2T), or a combination of disk-based and tape-based protection (D2D2T).
The data protection method is configured at the protection-group level. If you want to use different
methods to protect two data sources, the data sources cannot belong to the same protection
group.
The following table compares the advantages and disadvantages of each method.
Comparison of Data Protection Methods
Method Advantages Disadvantages When to use
Disk-based
protection only
• Speed of data
recovery.
• Speed of data
backup.
• Backups are less
likely to have errors.
• Ability to have
redundancy to
handle failure using
technologies such
as RAID.
• Disks are not a
simple solution for
archive needs,
because of the cost
of disks and the
inconvenience of
storing offsite.
• When you have
a limited data
loss tolerance.
• When you need
faster recovery
times.