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Homework and Emergencies Emergency UNIX and Linux Support Different OS Kernel Update Frequency Post 302555819 by pludi on Thursday 15th of September 2011 05:07:52 PM
Old 09-15-2011
Disclaimer: I can only attest for the Linux side of things here.

First of all, 3 to 6 months isn't that long of an uptime, as I've seen systems with 2+ years. And with the distributions you've listed there won't be any major kernel updates in that time, save important security updates, and even those don't force a reboot (but the new kernel will only be used after a reboot). If you really need high availability, better to look into proper redundancy by setting up a cluster, where a second node can easily take over should the primary suffer a hardware defect.
 

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CRM_STANDBY(8)							  [FIXME: manual]						    CRM_STANDBY(8)

NAME
crm_standby - manipulate a node's standby attribute to determine whether resources can be run on this node SYNOPSIS
crm_standby [-?|-V] -D -u|-U node -r resource crm_standby [-?|-V] -G -u|-U node -r resource crm_standby [-?|-V] -v string -u|-U node -r resource [-l string] DESCRIPTION
The crm_standby command manipulates a node's standby attribute. Any node in standby mode is no longer eligible to host resources and any resources that are there must be moved. Standby mode can be useful for performing maintenance tasks, such as kernel updates. Remove the standby attribute from the node when it should become a fully active member of the cluster again. By assigning a lifetime to the standby attribute, determine whether the standby setting should survive a reboot of the node (set lifetime to forever) or should be reset with reboot (set lifetime to reboot). Alternatively, remove the standby attribute and bring the node back from standby manually. OPTIONS
--help, -? Print a help message. --verbose, -V Turn on debug information. Note Increase the level of verbosity by providing additional instances. --quiet, -Q When doing an attribute query using -G, print just the value to stdout. Use this option with -G. --get-value, -G Retrieve rather than set the preference. --delete-attr, -D Specify the attribute to delete. --attr-value string, -v string Specify the value to use. This option is ignored when used with -G. --node-uuid node_uuid, -u node_uuid Specify the UUID of the node to change. --node-uname node_uname, -U node_uname Specify the uname of the node to change. --lifetime string, -l string Determine how long this preference lasts. Possible values are reboot or forever. Note If a forever value exists, it is always used by the CRM instead of any reboot value. EXAMPLES
Have a local node go to standby: crm_standby -v true Have a node (node1) go to standby: crm_standby -v true -U node1 Query the standby status of a node: crm_standby -G -U node1 Remove the standby property from a node: crm_standby -D -U node1 Have a node go to standby for an indefinite period of time: crm_standby -v true -l forever -U node1 Have a node go to standby until the next reboot of this node: crm_standby -v true -l reboot -U node1 FILES
/var/lib/heartbeat/crm/cib.xml--the CIB (minus status section) on disk. Editing this file directly is strongly discouraged. SEE ALSO
???, ??? AUTHOR
crm_standby was written by Andrew Beekhof. [FIXME: source] 07/05/2010 CRM_STANDBY(8)
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