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iDRAC 8/7 v2.30.30.30 User’s Guide

Considerations before creating virtual disks

Before creating virtual disks, consider the following:
  • Virtual disk names not stored on controller—The names of the virtual disks that you create are not stored on the controller. This means that if you reboot using a different operating system, the new operating system may rename the virtual disk using its own naming conventions.
  • 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.
  • There are limitations on the number of physical disks that can be included in the virtual disk. These limitations depend on the controller. When creating a virtual disk, controllers support a certain number of stripes and spans (methods for combining the storage on physical disks). Because the number of total stripes and spans is limited, the number of physical disks that can be used is also limited. The limitations on stripes and spans affect the RAID levels as follows:
    • Maximum number of spans affects RAID 10, RAID 50, and RAID 60.
    • Maximum number of stripes affects RAID 0, RAID 5, RAID 50, RAID 6, and RAID 60.
    • Number of physical disks in a mirror is always 2. This affects RAID 1 and RAID 10.
  • Cannot create virtual disks on PCIe SSDs.

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