HP Xw9300 NVIDIA: RAID Users Guide - Page 77

Specific Morphing Requirements, New Array Disk Requirements

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CHAPTER 3 Using the NVRAIDMAN Utility Specific Morphing Requirements The following table lists the disk requirements for a new RAID array for various morphing combinations. Table 3.1 RAID Array Disk Requirements for Morphing From To New Array Disk Requirementsi RAID 0 RAID 0 m > n RAID 1 Number of disks in the new array must be greater than the original array. m=2, n=1 RAID 0+1 RAID 1 array must include two disks, converted from a one disk RAID 0 array. m >= 2 x n Number of RAID 0+1 disks must be equal to or greater than twice the number of RAID 0 disks. RAID 1 RAID 0 No additional restrictions. RAID 1 ** Not a valid combination ** RAID 0+1 RAID 0+1 RAID 0 No additional restrictions. m >= n/2 Number of RAID 0 disks must be equal to or greater than half the number of RAID 0+1 disks. RAID 1 RAID 0+1 ** Not a valid combination ** m >= n + 2 ; where m must be an even number of disks. The new array must include at least two more disks than the original array, and can include any even number of disks beyond that. i. m = quantity of disks in the new array. n = quantity of disks in the original array. NVIDIA Corporation 73

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NVIDIA Corporation
73
C
HAPTER
3
Using the NVRAIDMAN Utility
Specific Morphing Requirements
The following table lists the disk requirements for a new RAID array for various
morphing combinations.
Table 3.1
RAID Array Disk Requirements for Morphing
From
To
New Array Disk Requirements
i
i.
m
= quantity of disks in the new array.
n
= quantity of disks in the original array.
RAID 0
RAID 0
m
>
n
Number of disks in the new array must be greater than the original array.
RAID 1
m
=2,
n
=1
RAID 1 array must include two disks, converted from a one disk RAID 0
array.
RAID 0+1
m
>= 2 x
n
Number of RAID 0+1 disks must be equal to or greater than twice the
number of RAID 0 disks.
RAID 1
RAID 0
No additional restrictions.
RAID 1
** Not a valid combination **
RAID 0+1
No additional restrictions.
RAID 0+1
RAID 0
m
>=
n/
2
Number of RAID 0 disks must be equal to or greater than half the number
of RAID 0+1 disks.
RAID 1
** Not a valid combination **
RAID 0+1
m
>=
n
+ 2 ; where
m
must be an even number of disks.
The new array must include at least two more disks than the original
array, and can include any even number of disks beyond that.