Storage Networks: The Complete Reference
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D
DAFS (Direct Access File System), 124, 493
data
access to. See data access
availability of. See availability
business application. See business application data
encryption, 425, 428430
hetero-data, 278
mirroring, 30, 174, 376
non-volatile, 66
organization model. See data organizational model
organizing, 115128, 285286
ownership of, 360
protection of, 7374, 174
recovery of. See recovery
sharing, 241, 244246
size of, 22, 4546, 6061
storage of. See data storage
striping, 376
temporary storage, 499
utilization of, 361
volatile, 6667
data access
business application data, 3031
challenges, 316, 2223
database systems, 125127
NAS, 4445
SANs, 60
servers, 16
storage networks and, 1819, 2223
See also user access
data blocks, 146
data centers
acquisition strategies, 417418
backup services, 368369, 380382
capacity planning, 401419
data availability, 368
data recovery, 369, 379382
division of responsibilities within, 402403
help desks, 399
problem management, 396400
SAN connectivity, 254262
services, 368369, 371
storage capacity, 370
storage problems within, 396400
data language compiler functions, 126
data mart applications, 471
data marts
described, 308, 492493
vs. data warehouses, 308
data organizational method (DOM), 282
data organizational model
data warehouse workloads, 309
departmental workloads, 325
I/O workloads, 285290
OLTP workloads, 300301
specialized workloads, 329330
web-based workloads, 305
WIT workloads, 327
data paths
data warehouse workloads, 310
departmental workloads, 325
described, 282
I/O workloads, 289290
OLTP workloads, 302, 310
specialized workloads, 330
web-based workloads, 306
WIT workloads, 328329
data protection workloads, 74
data replication, 262263, 369
data services, 368369, 371
data storage
application design, 416
architectures, 6576
challenges, 316
client/server. See client/server storage
elements of, 6670
hierarchy, 6870
Metro Data Areas, 21
need for, 4
Network Attached Storage. See NAS
online. See web-based storage
problems, 16
Storage Area Networks. See SANs
web-based. See web-based storage
See also storage systems
data warehouse applications, 1213, 471
data warehouse transactions, 308310
data warehouse workloads
applying SAN to, 308311
configurations, 310311
data organizational model, 309
data paths, 310
SANs, 256
data warehouses
data size and, 6061, 308
described, 308, 493
OLTP workloads, 308311
RDBMS technology and, 130132
SANs, 6061
vs. data marts, 308
data width, 97
database management systems (DBMS), 116
database manager functions, 126
database schema, 127
database servers, 1112
database systems
abstraction, 125126
access, 125127
components of, 126127
considerations, 127128
overview, 125128
performance, 117
databases
business application design, 56
challenges, 127128
concurrent factor, 302
data warehouse, 130
described, 116
embedded. See embedded databases
hierarchical data model, 127
network data model, 127
OLTP, 60
physical design of, 286
relational. See RDBMS
size of, 22
Static Database Model, 173
Very Large Databases, 51
data-centric applications, 12, 5051
data-centric workloads, 256
DBMS (database management systems), 116
departmental architecture, 139140, 319, 324326
departmental workloads, 324326
deposit application, 281284
DES algorithm, 445
device drivers. See drivers
devices, 7794
block, 146
controllers, 8384
disk systems. See disk systems
drivers. See drivers
Firewire connections, 110111
hardware failures, 357359
host adapters, 8182
magnetic disk storage, 8485
NAS. See NAS devices
peripheral connectivity, 7881
SAN. See SAN devices
SCSI, 103105
sharing, 242244
USB connections, 110111
differential bus, 101
Digital Linear Tape (DLT) format, 92, 493
Direct Access File System (DAFS), 124, 493
Direct Memory Access (DMA), 69, 124
director devices, 493
directories, 165167
director-level enterprise, 216
disaster recovery, 363364, 369
See also recovery
disk arrays, 8586, 210
disk cache, 78
disk drives , 15, 8485
disk systems, 8590
disks
capacity, 85
compression, 493
data storage and, 70
described, 70
fragmentation, 494
magnetic disk storage, 8485
partitions, 286
physical vs. logical locations, 8283
technical specifications, 85
virtual, 85
Distributed Desktop Management Task Force (DMTF) standard, 413
DLT (Digital Linear Tape) format, 92, 493
DMA (Direct Memory Access), 69, 124
DMTF (Distributed Desktop Management Task Force)standard, 413
DOM (data organizational method), 282
DP (data paths), 282
drivers
device I/O, 146
HBA, 208209, 240241, 441
host adapters, 81
RAID and, 241
SANs, 239241
software, 239241
switch OS, 239241
drives
disk, 15, 8485
tape, 9092
DVD media, 94, 267
DW (data warehouse) transactions, 308310
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