Adaptec 131U2 Hardware Guide - Page 37

Performance and Data Protection with M

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Creating an Array With the ARRAYCONFIG U2 Utility 4 When the next screen appears, select the type of array you want to create: - Select Optimized for Performance (RAID 0) if you want the fastest possible data input and output from the new array. This kind of array does not have special data protection features, however. When prompted, type the number of disks you want in this array. - Select Optimized for Data Protection (RAID 1) if your main concern is to protect the files on the array from disk failure. This kind of array safeguards files in the array even if one of the array disks fails. (This kind of array has two disks by definition, so you will not be prompted to enter the number of disks you want in the array.) - Select Performance and Data Protection with Parity (RAID 5) if you want fast performance and data protection, and you have three or more disks available for the array. This kind of array contains redundant (parity) data distributed across all disks in the array. If any one disk fails, data can be reconstructed from the parity information. If a second disk fails before the array has been reconstructed, all data is lost. The actual usable data capacity of the array is equal to one less than the total number of disks. (One disk's worth of capacity is needed to hold the parity information.) - Select Performance and Data Protection with Mirroring (RAID 0/1) if you want fast performance and data protection, and have an even number of disks available for the array. This kind of array stripes and mirrors data on two or more pairs of disks. If one disk in a pair fails, data is available. The actual data capacity of the array equals half the total available disk space. 5 When the next menu appears, select the type of applications that you will run on your system. (Select Others if you are not sure what type of applications you will use.) ARRAYCONFIG U2 will use your answer to create the best array configuration for your applications. 3-3

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3-3
Creating an Array With the ARRAYCONFIG U2 Utility
4
When the next screen appears, select the type of array you
want to create:
–
Select
Optimized for P
erformance (RAID 0)
if you want
the fastest possible data input and output from the new
array. This kind of array does not have special data protec-
tion features, however. When prompted, type the number
of disks you want in this array.
–
Select
Optimized for D
ata Protection (RAID 1)
if your
main concern is to protect the files on the array from disk
failure. This kind of array safeguards files in the array even
if one of the array disks fails. (This kind of array has two
disks by definition, so you will
not
be prompted to enter
the number of disks you want in the array.)
–
Select
Performance and Data Protection with Par
ity
(RAID 5)
if you want fast performance and data protection,
and you have three or more disks available for the array.
This kind of array contains redundant (parity) data distrib-
uted across all disks in the array. If any one disk fails, data
can be reconstructed from the parity information. If a second
disk fails before the array has been reconstructed, all data is
lost. The actual usable data capacity of the array is equal to
one less than the total number of disks. (One disk’s worth of
capacity is needed to hold the parity information.)
–
Select
Performance and Data Protection with M
irroring
(RAID 0/1)
if you want fast performance and data protec-
tion, and have an even number of disks available for the
array. This kind of array stripes and mirrors data on two or
more pairs of disks. If one disk in a pair fails, data is avail-
able. The actual data capacity of the array equals half the
total available disk space.
5
When the next menu appears, select the type of applications
that you will run on your system. (Select
Others
if you are not
sure what type of applications you will use.)
ARRAYCONFIG
U2
will use your answer to create the best array configuration
for your applications.