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DELL PowerVault MD3200i/MD3220i Technical Guide Book

about a selected problem, and recovery steps to follow for the selected problem.

Physical and Logical Disks

A disk group is a set of physical disks that the controller

logically groups together to provide one or more virtual

disks to a host. Each disk group is comprised of the

same drive technology (i.e. SAS, near-line SAS or SSD)

and has an assigned RAID level. While multiple RAID

levels can be intermixed in a single MD3200i series

storage array, each disk group has a single RAID level.

The number of physical disks that make up a disk group

can be selected manually or automatically. When using

the MD Storage Manager software's automatic

configuration option, disk groups will be configured

balancing the load across as many physical disk channels

and physical disk modules as possible. This ensures maximum protection and performance.

MD Storage Manager software also provides the ability to dynamically add additional physical disks to

existing disk groups. Existing virtual disks are then re-striped across all physical disks in the newly

expanded disk group. This takes place while the disk group and all its virtual disks remain online and

accessible for I/O.

The selection of the RAID configurations is equally critical for each application to meet the desired

data availability, performance or capacity requirements. And like physical disk types and configuration

settings, the MD3200i series of arrays support the intermixing of RAID configurations to provide

maximum flexibility and utilization. RAID 5 is generally considered the best balance of cost,

performance and reliability. The table below outlines the tradeoffs of the various supported RAID

configurations.

Working with

Disk Group A

Disk