Service manual

Sizing Disk Subsystems
88 Sun ONE Directory Server Installation and Tuning Guide • June 2003
If the deployment involves replication, plan additional space to hold initialization
LDIF files, as these differ from backup LDIF files.
Memory Based Rather Than Disk Based File Systems
Some systems support memory based tmpfs file systems. On Solaris forexample
/tmp is often mounted as a memory based file system to increase performance. If
cache files are placed on
/tmp, a location shared with other applications on the
system, ensure that the system never runs out of space under
/tmp. Otherwise,
when memory is low, Directory Server files in memory based file systems may be
paged to the disk space dedicated for the swap partition.
Some systems support RAM disks and other alternative memory based file
systems. Refer to the operating system documentation for instructions on creating
and administering memory based file systems. Notice that everything in such file
systems is volatile and must be reloaded into memory after system reboot.
(UNIX Platforms) Core Files
Leaveroomforatminimumoneortwocore files. Although Directory Server
should not dump core, recovery and troubleshooting after a crash can be greatly
simplified if the
core file generated during the crash is available for inspection.
When generated,
core files are stored either in the same directory as the file
specified by
nsslapd-errorlog on cn=config,orunder
ServerRoot
/bin/slapd/server/ if a crash occurs during startup.
Space for Administration
Leave room for expected system use,including system and Directory Server
administration. Ensure that sufficient space is allocated for the base Directory
Serverinstallation, for the configurationsuffix if it resideson the local instance, for
configuration files, and so forth.
Distributing Files Across Disks
By placing commonly-updated Directory Server database and log files on separate
disk subsystems, you can spread I/O traffic across multiple disk spindles and
controllers, avoiding I/O bottlenecks. Consider providing dedicated disk
subsystems for each of the following items.