See also, Planning the disk configuration – Dell PowerVault DP600 User Manual
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See Also
Planning the Disk Configuration
Planning the DPM Server Configurations
Planning the Disk Configuration
If you are using direct-attached storage for the DPM storage pool, you can use any hardware-
based configuration of redundant array of independent disks (RAID), or you can use a "just a
bunch of disks" (JBOD) configuration. Do not create a software-based RAID configuration on
disks that you will add to the storage pool.
To decide on the configuration for the disks, consider the relative importance of capacity, cost,
reliability, and performance in your environment. For example, because JBOD does not consume
disk space for storing parity data, a JBOD configuration makes maximum use of storage capacity.
For the same reason, the reliability of JBOD configurations is poor; a single disk failure inevitably
results in data loss.
For the typical DPM deployment, a RAID 5 configuration offers an effective compromise between
capacity, cost, reliability, and performance. However, because the DPM server workload is
composed primarily of write operations, RAID 5 is likely to degrade the performance of a DPM
server more markedly than it would in the case of a file server. This degradation in performance
can in turn affect the scalability of DPM. The ability of DPM to effectively protect data degrades as
performance degrades.
To help you evaluate options for configuring the disks in your storage pool, the following table
compares the trade-offs between JBOD and the various levels of RAID, on a scale from 4 (very
good) to 1 (acceptable).
Comparison of Configuration Options for Storage Pool Disks
Disk Configuration
Capacity
Cost
Reliability
Performance and
Scalability
JBOD
4
4
1
4
RAID 0
4
4
1
4
RAID 1
1
1
4
3
RAID 5
3
3
3
2
RAID 10
1
1
4
4
For more information about RAID, s
(http://go.microsoft.com/fwlink/?LinkId=46086).