Adaptec 3210S User Guide - Page 138

Understanding the Array Selection Criteria, Criteria, Definition, Examples

Get Adaptec 3210S - SCSI RAID Controller PDF manuals and user guides
UPC - 760884138250
View all Adaptec 3210S manuals
Add to My Manuals
Save this manual to your list of manuals

Page 138 highlights

Adaptec Storage Manager Pro User's Guide Understanding the Array Selection Criteria To help you choose an array type, use the criteria in the following table. Decide how important each criterion is to meeting your data management and storage needs. Criteria Random-read performance Random-write performance Sequentialread performance Sequentialwrite performance Fault tolerance Expansion Load balancing Cost per usable unit of space Definition Ability to locate and read data directly from a file without having to search sequentially from the beginning of the file. Ability to write data directly to a file without having to search sequentially from the beginning of the file. Ability to read large numbers of consecutive data elements. Ability to write large numbers of consecutive data elements. Ability to recover from a failure of one or more drives without interrupting user or application access to data. Ability of the system to increase the available storage capacity for the operating system's file system. Ability to spread I/O across drives. Ability to use all space in an array to store user data. (Unusable space includes parity in a RAID 5 set and the redundant half of a mirror set.) Examples Databases, transaction processing programs, and operating system page file Databases, transaction processing programs, and operating system page file Streaming video programs and backup/ restore programs Streaming video programs and backup/ restore programs Whenever data is more important than the cost of storing it Most systems require expansion capabilities to meet growing data storage needs. All I/O-intensive applications benefit from load balancing. N/A B-8

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
B-8
Adaptec Storage Manager Pro User
’
s Guide
Understanding the Array Selection Criteria
To help you choose an array type, use the criteria in the following
table. Decide how important each criterion is to meeting your data
management and storage needs.
Criteria
Definition
Examples
Random-read
performance
Ability to locate and read
data directly from a file
without having to search
sequentially from the
beginning of the file.
Databases, transaction
processing programs,
and operating system
page file
Random-write
performance
Ability to write data directly
to a file without having to
search sequentially from the
beginning of the file.
Databases, transaction
processing programs,
and operating system
page file
Sequential-
read
performance
Ability to read large numbers
of consecutive data elements.
Streaming video
programs and backup/
restore programs
Sequential-
write
performance
Ability to write large
numbers of consecutive data
elements.
Streaming video
programs and backup/
restore programs
Fault
tolerance
Ability to recover from a
failure of one or more drives
without interrupting user or
application access to data.
Whenever data is more
important than the cost
of storing it
Expansion
Ability of the system to
increase the available storage
capacity for the operating
system
’
s file system.
Most systems require
expansion capabilities
to meet growing data
storage needs.
Load
balancing
Ability to spread I/O across
drives.
All I/O-intensive
applications benefit
from load balancing.
Cost per
usable unit of
space
Ability to use all space in an
array to store user data.
(Unusable space includes
parity in a RAID 5 set and the
redundant half of a mirror
set.)
N/A