Maximizing Performance and Scalability with IBM WebSphere
L
Last value
in Performance tool network utilization output, 496
lazy initialization
using in the WebSphere business tier , 403
LDAP environments
forms of clustering in, 345
high-availability implementation, 346
implementation and performance, 345 “347
LDAP farm
using LDAP master/replica techniques to configure, 346
LDAP server clustering
available for LDAP environments, 345
LDAP servers
options and considerations, 344 “345
supported by WebSphere, 344 “347
legacy integration. See legacy systems integration
legacy systems integration
design considerations for, 455 “472
example CORBA and WebSphere implementation, 457
example of, 454
performance optimization, 453 “472
via XML over SOAP or XML RPC, 455
what it is, 453 “455
legacy systems integration components
as part of a WebSphere queue, 280
level 3cache component
function of, 113
lightweight connections
teardown of vs. Remote Method Invocation (RMI) connections, 270 “271
Lightweight Directory Access Protocol (LDAP) server clustering, 294
Lightweight Processes (LWP)
function of, 259 “260
limp home modes
used by some load balancers, 354
Linux
disabling the TCP Selective Acknowledgment setting, 256
getting network interface statistics in, 491
and Lightweight Processes (LWP), 259 “260
optimization and tuning checklist for, 255 “260
Linux swap space command, 480
Linux TCP/IP stack
features that can impede performance, 255
optimization, 255
Linux-based WebSphere application server
deactivating the TCP Acknowledgment feature, 256
deactivating the TCP keepalive feature in, 256 “257
disabling the TCP time stamping feature, 256
increasing the amount of open files, 258 “259
increasing the socket buffer memory allocation, 257 “258
live production shakeout, 15
load average
defined, 476
load balancer
needed in front of Web HTTP servers, 303 “304
load balancers
as critical components of business systems, 352 “353
routing mechanism approach, 355
in WebSphere-based applications, 354 “356
load balancing
achieving redundancy with DNS round- robin configuration, 308 “309
using cloning to extend in WebSphere, 67
load balancing and firewall environment
other considerations for, 355 “356
load testing and profiling applications
for WebSphere application environments, 243 “244
LoadBalanceWeight directive
function of in failover configurations, 317 “318
LoadBalanceWeight setting
example of function of in WebSphere 5, 318 “320
LoadRunner, Mercury Interactive
stress and volume testing tool, 246
local network environment
main categories of within a WebSphere environment, 162 “164
log_buffer parameter
for Oracle system configuration and tuning, 437
Logbufsz parameter
setting in IBM DB2, 441
logical partitioning (LPAR)
in IBM PowerPC platform (pSeries), 147
Lotus Domino Enterprise Server
supported by WebSphere, 344
LPAR. See logical partitioning (LPAR)
LVD (Low Voltage Differential) SCSI
function of, 121 “122
LWPs (Lightweight Processes). See Lightweight Processes (LWP)
Lynx
command line Web browser, 245