HP Xw9300 NVIDIA: RAID Users Guide - Page 45

Setting Up a Spare RAID Disk, Free Disk, Dedicated Disk

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CHAPTER 3 Using the NVRAIDMAN Utility Setting Up a Spare RAID Disk You can designate a hard drive to be used as a spare drive for a RAID 1 or RAID 0+1 array2. The spare drive can take over for a failed disk. NVIDIA RAID supports two types of spare drives: • Free Disk A free disk is a disk that is not part of any RAID array, but can be used by any available RAID 1 or RAID 0+1 array that requires a particular disk when one of its disks crashes or becomes unusable. The process is automatic and doesn't require any user interaction. For example, if you have a system with four hard disks where one disk is used to boot the OS, two hard drives are set up in a mirrored array, and a fourth hard disk is set up as a free disk, then if one of the mirrored array drives fails, the free disk will be automatically assigned to the mirrored array to be used instead of the failed disk. • Dedicated Disk A dedicated free disk is a disk that is assigned to a RAID 1 or RAID 0+1 array and that disk is used by that array only when needed, for example during a system crash where a RAID mirrored drive is broken. The dedicated disk can be used only by the array that it is assigned to and not by any other array, unlike a free disk which can be used by any available RAID 1 or RAID 0+1 array. Note: You must have at least two RAID arrays to use this feature. 2. Spare disks cannot be used for RAID0 or JBOD arrays. NVIDIA Corporation 41

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NVIDIA Corporation
41
C
HAPTER
3
Using the NVRAIDMAN Utility
Setting Up a Spare RAID Disk
You can designate a hard drive to be used as a spare drive for a RAID 1 or RAID 0+1
array
2
. The spare drive can take over for a failed disk. NVIDIA RAID supports two types
of spare drives:
•
Free Disk
A free disk is a disk that is not part of any RAID array, but can be used by any available
RAID 1 or RAID 0+1 array that requires a particular disk when one of its disks crashes
or becomes unusable. The process is automatic and doesn’t require any user
interaction.
For example, if you have a system with four hard disks where one disk is used to boot
the OS, two hard drives are set up in a mirrored array, and a fourth hard disk is set up
as a free disk, then if one of the mirrored array drives fails, the free disk will be
automatically assigned to the mirrored array to be used instead of the failed disk.
•
Dedicated Disk
A dedicated free disk is a disk that is assigned to a RAID 1 or RAID 0+1 array and that
disk is used by that array only when needed, for example during a system crash where
a RAID mirrored drive is broken. The dedicated disk can be used only by the array that
it is assigned to and not by any other array, unlike a free disk which can be used by any
available RAID 1 or RAID 0+1 array.
Note:
You must have at least two RAID arrays to use this feature.
2.
Spare disks cannot be used for RAID0 or JBOD arrays.