Nvidia 4 - Manual (Page 74)

70 MediaShield User’s Guide – Version 4.0
C HAPTER 3
Using the NVIDIA MediaShield RAID Management Utility
Specific Migrating Requirements
The following table lists the disk requirements for a new RAID array for various
migrating combinations.
Table 3.1 RAID Array Disk Requirements for Migrating
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 5 m >= n + 1
RAID 1 RAID 0 No additional restrictions.
RAID 1 ** Not a valid combination **
RAID 0+1 No additional restrictions.
RAID 5 m >= 3
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.
RAID 5 m >= (n/2 + 1)
RAID 5 RAID 0 m >= n - 1
RAID 1 ** Not a valid combination **
RAID 0+1 m >= 2 x (n - 1) ; where m is an even number of disks.
RAID 5 m >= n