User's Manual

For information about the maximum number of physical disks supported by a virtual disk, see the virtual

disk specifications for the controller in Supported Features.

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Virtual Disk Considerations For PERC S100, S110, And S300 Controllers

Number Of Virtual Disks Per Controller

There are limitations on the number of virtual disks that can be created on the controller. For information

about the maximum number of virtual disks supported by a controller, see the virtual disk specifications

for the controller in Supported Features.

Calculation For Maximum Virtual Disk Size

The Create Virtual Disk Express Wizard displays the minimum and maximum values for the virtual disk

size. This section describes how the maximum possible size for the virtual disk is calculated based on the

controller type. To identify the controller type, see RAID Controller Technology: SCSI, SATA, ATA, and

SAS.

SCSI, SATA, And ATA RAID Controllers

When using a SCSI, SATA, and ATA RAID controller, the controller calculates the maximum virtual disk

size based on your RAID level selection and the available physical disk space provided by all suitable

physical disks attached to the controller. For example, if the controller contains 12 physical disks with

available space and you have specified a RAID 5, then the controller calculates the maximum virtual disk

size based on the disk space provided by the 12 physical disks, because the 12 physical disks can be

included in a RAID 5.

SAS RAID Controllers

When using a SAS controller, the controller calculates the maximum virtual disk size based on the

available disk space provided by the minimum number of physical disks required to create the RAID level

you selected. For example, if you specified a RAID 5, then the controller calculates the maximum virtual

disk size based on three physical disks, because only three physical disks are required to create a RAID 5.

Channel-Redundant Virtual Disks

When creating a virtual disk, it is possible to use disks attached to different channels to implement

channel redundancy. This configuration might be used for disks that reside in enclosures subject to

thermal shutdown.

NOTE: Channel redundancy only applies to controllers that have more than one channel and that

attach to an external disk enclosure.