Microsoft Office Tutorials and References
In Depth Information
Choosing media for DPM
Choosing media for DPM
With DPM you have short-term and long-term protection options. This is true
regardless of whether you choose tape or disk. Tapes and disks have different
schedule options. Short-term protection options for tapes can be scheduled in a range
of 1-12 weeks. You can back up on tape daily, weekly, or bi-weekly. You set this
through the retention range. For long-term range protection you can select from 1
week up to 99 years. These are called tape archives. Again this is set by the retention
range. With disk-based protection you can choose to back up as often as 15 minutes
all the way up to once every 24 hours. You can set the retention range for
diskbased protection between 1 and 448 days. For long-term protection you can set the
retention range from 1 to 99 years. You can also choose offsite cloud protection as a
long-term solution. We will cover offsite cloud protection in Chapter 9 .
Storage pools
A storage pool is a group of hard disks in the DPM server. These disks are where
DPM stores the replicas and recovery points. DPM can use any of the following
solutions for its storage pool:
• SAN's iSCSI or a Fiber Channel SAN
• (DAS) Direct Attached Storage
• Internal hard disks
In this topic, I will use an eSATA DAS solution in my examples. You don't need
a DAS or SAN though, you can simply purchase some extra disks, insert them
into your server and back up to them; DPM supports IDE, SATA, and SCSI. When
planning for your storage pool you need to consider capacity requirements which
are covered next and the configuration of your disks such as, are you going to use a
DAS or SAN? Internal disks or a DAS solution are less expensive compared to a SAN
solution however you will get better performance with a SAN.
With a DAS solution you have the option of using a hardware RAID. Note that
RAID cannot be a software based RAID it has to be hardware based. You could
also use a JBOD (Just a Bunch Of Disks) DAS solution. A JBOD solution will
appear as one large disk. A RAID solution can provide improved performance and
redundancy. Microsoft recommends that you choose a RAID 5 if you go with a RAID
solution; however this will not apply to every deployment. Depending on business
requirements, JBOD or RAID 0, RAID 1, RAID 5, or RAID 10 may be more suitable.
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