04-24-2019
High Availibility with Active/Passive Scenario should not be that hard. Clustering different Systems("OS") that way is also possible.
One major point is data storage. Most applications store data and thus this data needs to be shared between both systems. Either with a shared network storage, which has to be HA-enabled too or with a replication technology like drbd(aka "shared nothing") which is replicating the data in realtime.
In Front of your two application servers you may have a loadbalancer, which of course should also be HA-enabled.
All this could be done with pacemaker.
Last edited by hicksd8; 04-24-2019 at 11:20 AM..
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LEARN ABOUT OPENSOLARIS
dhcp_modules
dhcp_modules(5) Standards, Environments, and Macros dhcp_modules(5)
NAME
dhcp_modules - data storage modules for the DHCP service
DESCRIPTION
This man page describes the characteristics of data storage modules (public modules) for use by the Solaris Dynamic Host Configuration Pro-
tocol (DHCP) service.
Public modules are the part of the DHCP service architecture that encapsulate the details of storing DHCP service data in a data storage
service. Examples of data storage services are NIS+, Oracle, and ufs file systems.
Public modules are dynamic objects which can be shipped separately from the Solaris DHCP service. Once installed, a public module is visi-
ble to the DHCP service, and can be selected for use by the service through the DHCP service management interfaces (dhcpmgr(1M), dhcpcon-
fig(1M), dhtadm(1M), and pntadm(1M)).
Public modules may be provided by Sun Microsystems, Inc or by third parties.
The Solaris DHCP service management architecture provides a mechanism for plugging in public module-specific administration functionality
into the dhcpmgr(1M) and dhcpconfig(1M) utilities. This functionality is in the form of a Java Bean, which is provided by the public module
vendor. This Java Bean collects public module-specific configuration from the user (you) and provides it to the Solaris DHCP service.
The Solaris DHCP service bundles three modules with the service, which are described below. There are three dhcpsvc.conf(4) DHCP service
configuration parameters pertaining to public modules: RESOURCE, PATH, and RESOURCE_CONFIG. See dhcpsvc.conf(4) for more information about
these parameters.
SUNWfiles
This module stores its data in ASCII files. Although the format is ASCII, hand-editing is discouraged. It is useful for DHCP service envi-
ronments that support several hundred to a couple thousand of clients and lease times are a few hours or more.
This module's data may be shared between DHCP servers through the use of NFS.
SUNWbinfiles
This module stores its data in binary files. It is useful for DHCP service environments with many networks and many thousands of clients.
This module provides an order of magnitude increase in performance and capacity over SUNWfiles.
This module's data cannot be shared between DHCP servers.
SUNWnisplus
This module stores its data within a NIS+ domain. It is useful in environments where NIS+ is already deployed and facilitates sharing among
multiple DHCP servers. This module suports several hundred to a few thousand clients with lease times of several hours or more.
The NIS+ service should be hosted on a machine with ample CPU power, memory, and disk space, as the load on NIS+ is significant when it is
used to store DHCP data. Periodic checkpointing of the NIS+ service is necessary in order to roll the transaction logs and keep the NIS+
service operating at its highest efficiency. See nisping(1M) and crontab(1) for more information.
SEE ALSO
crontab(1), dhcpconfig(1M), dhcpmgr(1M), dhtadm(1M), nisping(1M), pntadm(1M), dhcpsvc.conf(4), dhcp(5)
Solaris DHCP Service Developer's Guide
SunOS 5.11 24 Jan 2003 dhcp_modules(5)