Microsoft Office Tutorials and References
In Depth Information
Choosing media for DPM
Microsoft recommends that you do not use single disks that go over 1.5 TB. DPM can
span up to 32 disks so Microsoft recommends using multiple disks for your storage
pool configuration.
In DPM you can use a volume over a storage pool. You would need to assign a
custom volume to your protection group member indicating that you want to use
the volume instead of the storage pool. Almost any volume on a DPM server can be
used as a custom volume for a protection group. You cannot use a volume with the
operating system or program files on it as a custom volume for DPM. You would
use a custom volume if you wanted more control over the storage DPM uses to
back up onto.
One of the major differences between a custom volume and a storage pool is that
DPM can manage a storage pool but DPM cannot manage a custom volume. You
would have to manage a custom volume through windows disk management. Here
is an example, if your volume for a protection group member started running out
of space you would have to manually increase this. If you are using a storage pool
and it is running out of space, DPM can automatically increase the space to the
amount needed if it is available. On protection groups you cannot change from a
storage pool to a custom volume or the other way around once it has been set. This
is something you need to consider when planning to use or not use storage pools.
It is recommended that you use storage pools unless there is a strong reason not to
because you will have better management through DPM with a storage pool.
For offsite purposes, you can use tapes, DPM2DPM, or offsite cloud solutions.
Tapes are a good option but can be costly as you may have to pay for storage and
transportation of the tapes as well as the hardware and media. An offsite cloud is
newer, so this is a good option with little upfront investment. It requires monthly
fees and a robust bandwidth connection to sync data with the offsite vendor.
To use a tape library with DPM it has to be SAN, iSCSI, or SCSI attached. You need
to consider the amount of tape backup jobs with the size of protected data. Also
there are many types of tape options. You can have a library that loads the tapes
automatically for you or a manual loader where a human has to swap tapes in a
manual loader but this is prone to human error. To calculate the amount of tape
storage required, multiply the backup frequency by the retention range. DPM
has a default tape labeling scheme, if you want your own custom scheme you
will need to plan this ahead of time. This is the default DPM tape label format:
( DPM - <ProtectionGroupName> - long-term tape <number> ). We will cover
offsite backup in more detail in Chapter 9 .
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