User's Manual

ManualsBrandsDell Manualscomputer componentsOpenManage Server Administrator Version 7.0

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214 Virtual Disks

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Implementing channel redundancy

—A virtual disk is channel-redundant

when it maintains redundant data on more than one channel. If one of the

channels fails, data is not lost because redundant data resides on another

channel. For more information, see Channel Redundancy and Thermal

Shutdown.

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Rebuilding data

—An failed physical disk that is used by both redundant

and non-redundant virtual disks cannot be rebuilt. Rebuilding a failed

physical disk in this situation requires deleting the non-redundant virtual

disk.

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Disk Group Concept Consideration for S110

—Disk grouping is a logical

grouping of disks attached to a RAID controller on which one or more

virtual disks are created, such that all virtual disks in the disk group use all

of the physical disks in the disk group. The current implementation

supports the blocking of mixed disk groups during the creation of logical

devices.

Physical disks are bound to disk groups, therefore, there is no RAID level

mixing on one disk group.

Storage Management Server implements disk group concept during virtual

disk creation. Functionally, after a group of physical disks are used to

create their first virtual disk, unused space in the disk is used only to

expand virtual disk, or create new virtual disks in the unused space; The

virtual disks have identical RAID level.

Also, existing mixed configuration are not affected. However, you cannot

create mixed configurations.

You can read or write to the virtual disks, rebuild, and delete the disks.

You cannot create virtual disks on a set of disks migrated from earlier

Software RAID versions and configured with multiple RAID levels.

Virtual Disk Considerations for CERC SATA1.5/6ch, and CERC SATA1.5/2s

Controllers

When creating a virtual disk on a CERC SATA1.5/6ch or CERC SATA1.5/2s

controller, the physical disk selection has implications for how effectively a

hot spare can rebuild the virtual disk. For more information, see

Understanding Hot Spares and Considerations for Hot Spares on CERC

SATA1.5/6ch, S100, and S300 Controllers.