3Ware 9550SXU16MLB10 User Guide - Page 189

KB, or 256KB., Striping., Subunit., UDMA mode., Unit ID, Unit Number, Verify

Get 3Ware 9550SXU16MLB10 - Itec - 9550sxu-16ml Multi-lane Internal Sata Ii Hardware Raid Controller Integrat PDF manuals and user guides
UPC - 693494971613
View all 3Ware 9550SXU16MLB10 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 189 highlights

during configuration. In general, smaller stripe sizes are better for sequential I/O, such as video, and larger strip sizes are better for random I/O (such as databases). The stripe size is user-configurable at 64KB, 128KB, or 256KB. This stripe size is sometimes referred as a a "minor" stripe size. A major stripe size is equal to the minor stripe size times the number of disks in the unit. „ Striping. The process of breaking up files into smaller sizes and distributing the data amongst two or more drives. Since smaller amounts of data are written to multiple disk drives simultaneously, this results in an increase in performance. Striping occurs in RAID 0, 5, 10 and 50. „ Subunit. A logical unit of storage that is part of another unit. For example, the mirrored pairs (RAID 1) in a RAID 10 unit are subunits of the RAID 10 unit. „ UDMA mode. UDMA mode is a protocol that supports bursting data up to 133 MB/sec with PATA disk drives and 1500 Mbit/sec with SATA disk drives. „ Unit ID. A unique identifier for a specific unit in a system. „ Unit Number. The SCSI number, or channel number, of a particular unit. „ Unit. A logical unit of storage, which the operating system treats as a single drive. A unit may consist of a single drive or several drives. Also known as an array. „ Verify. A process that confirms the validity of the redundant data in a redundant unit. For a RAID 1 and RAID 10 unit, a verify will compare the data of one mirror with the other. For RAID 5 and RAID 50, a verify will calculate RAID 5 parity and compare it to what is written on the disk drive. www.3ware.com 183

  • 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
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
www.3ware.com
183
during configuration. In general, smaller stripe sizes are better for
sequential I/O, such as video, and larger strip sizes are better for random
I/O (such as databases). The stripe size is user-configurable at 64KB,
128KB, or 256KB.
This stripe size is sometimes referred as a a “minor” stripe size. A major
stripe size is equal to the minor stripe size times the number of disks in the
unit.
Striping.
The process of breaking up files into smaller sizes and
distributing the data amongst two or more drives. Since smaller amounts
of data are written to multiple disk drives simultaneously, this results in
an increase in performance. Striping occurs in RAID 0, 5, 10 and 50.
Subunit.
A logical unit of storage that is part of another unit. For
example, the mirrored pairs (RAID 1) in a RAID 10 unit are subunits of
the RAID 10 unit.
UDMA mode.
UDMA mode is a protocol that supports bursting data up to
133 MB/sec with PATA disk drives and 1500 Mbit/sec with SATA disk
drives.
Unit ID
. A unique identifier for a specific unit in a system.
Unit Number
. The SCSI number, or channel number, of a particular unit.
Unit
. A logical unit of storage, which the operating system treats as a
single drive. A unit may consist of a single drive or several drives. Also
known as an array.
Verify
. A process that confirms the validity of the redundant data in a
redundant unit. For a RAID 1 and RAID 10 unit, a verify will compare the
data of one mirror with the other. For RAID 5 and RAID 50, a verify will
calculate RAID 5 parity and compare it to what is written on the disk
drive.