D-Link DSN-540 Software User's Guide for DSN-1100-10 - Page 14

Volumes

Get D-Link DSN-540 PDF manuals and user guides
UPC - 790069324017
View all D-Link DSN-540 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 14 highlights

Storage Pool Available Pool Base Pool Spare Pool Unusable Pool Table 1-1. Types of Storage Pools Usage Disk drives available for use, but with no data stored on them at this time. A drive in the Base Pool will be used in the creation of a new Volume any time it is required. That drive is automatically moved to the Base Pool at that time with no manual interaction. Disk drives currently being used to hold Volume data or ready to be used to hold volume data. A drive that can only be used in case of a failure of a drive in the Base Pool. A drive becomes a Spare only when a customer administrator so designates. Two types of drives appear in the Unusable Pool:  Drives not available for use either because they have already failed and have not been removed from the enclosure  Drive inserted into the xStack Storage system that were previously used by an xStack Storage system. Such a drive can be Initialized by the Administrator to make the drive available for use (which automatically moves the drive to the Available Pool) When a new system is installed, all new drives are placed in the Available Pool. The drives remain in the Available Pool until they are needed for use in a volume. 1.4 Volumes A volume is a set of blocks of storage that are organized and presented for use by a customer's server (an iSCSI initiator node). Every volume must be associated with a storage pool, which limits the drives that can be used to hold data for that Volume (only drives in that pool can be used for this volume). Only drives in the Base Pool can be used for volumes. The iSCSI initiator node sees the volume as a contiguous series of numbered blocks in the same way that it would see the storage space on a single disk drive. The xStack Storage system constructs a volume from extents, where each extent is a block of storage from a single drive. A volume typically consists of extents from several drives. A volume of n blocks is shown in Figure 1-2. 0 Extent 1 . . . Extent x n-1 Volume Figure 1-2. Internal Structure of a Volume Volumes can be organized in several ways (see Table 1-2) 4 Chapter 1 Introduction

  • 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
4
Chapter 1 Introduction
Table 1-1. Types of Storage Pools
Storage Pool
Usage
Available Pool
Disk drives available for use, but with no data stored on them at this time.
A
drive in the Base Pool will be used in the creation of a new Volume any time it is
required.
That drive is automatically moved to the Base Pool at that time with no
manual interaction.
Base Pool
Disk drives currently being used to hold Volume data or ready to be used to hold
volume data.
Spare Pool
A drive that can only be used in case of a failure of a drive in the Base Pool.
A
drive becomes a Spare only when a customer administrator so designates.
Unusable Pool
Two types of drives appear in the Unusable Pool:
Drives not available for use either because they have already failed and have
not been removed from the enclosure
Drive inserted into the xStack Storage system that were previously used by an
xStack Storage system.
Such a drive can be Initialized by the Administrator to
make the drive available for use (which automatically moves the drive to the
Available Pool)
When a new system is installed, all new drives are placed in the
Available Pool
. The drives
remain in the
Available Pool
until they are needed for use in a volume.
1.4
Volumes
A volume is a set of blocks of storage that are organized and presented for use by a
customer’s server (an iSCSI initiator node). Every volume must be associated with a storage
pool, which limits the drives that can be used to hold data for that Volume (only drives in
that pool can be used for this volume). Only drives in the Base Pool can be used for volumes.
The iSCSI initiator node sees the volume as a contiguous series of numbered blocks in the
same way that it would see the storage space on a single disk drive. The xStack Storage
system constructs a volume from extents, where each extent is a block of storage from a
single drive. A volume typically consists of extents from several drives. A volume of
n
blocks
is shown in Figure 1-2.
Volume
Extent 1
.
.
.
Extent x
0
n-1
Figure 1-2. Internal Structure of a Volume
Volumes can be organized in several ways (see Table 1-2)