User's Manual

138 Known Issues and Frequently Asked Questions
A: The nexus used to display array disks is "channel:target:lun." The Logical
Unit Number (LUN) is always "0." The channel and the target IDs are
necessary to identify array disks when dealing with SCSI devices.
When dealing with SAS devices, the array disk location is displayed as
"channel:target:enclosure." It is possible to have the enclosure value as non-
zero. If the enclosure has a non-zero value, then all three numbers (channel,
target, and enclosure) have to be included on the command line.
Q: Do I need to specify RAID type and size when creating virtual disk(s)?
A: No. The default RAID type is RAID 0. If RAID size is not provided, the
maximum size allowed for virtual disk is created. The mandatory fields
required to create virtual disks are the controller slot ID and the array disks.
Q: What is a hotspare (failover drive)?
A: A hotspare is an extra and unused disk drive that is part of an array disk
subsystem. A hotspare is always in standby mode. If a disk failure occurs, the
hotspare replaces the failed drive without interrupting the system.
Q: What is mr2kserv.exe?
A: This is a service needed to configure all LSI RAID controllers in Windows
PE. It provides Plug and Play support.
Q: What features have changed from the
MS-DOS version of RAIDCFG to
the Windows PE and embedded Linux versions?
A: Windows PE and embedded Linux version of RAIDCFG support new
controllers. For the list of supported controllers, see Dell Systems Software
Support Matrix on the Dell Support website at support.dell.com/manuals.
Features that have been removed from the DOS version include:
•The --name and --wait options in the create command
•The
--runlocation and the --scratchlocation options
•The
--getpercentcomplete environment variables
Q: What is the minimum virtual disk size that I can create?
A: For CERC-SATA 1.5/6ch controllers:
•RAID 0: 10MB
•RAID 1: 9MB
•RAID 5: 9MB