Make changes to a running system
================================

web resources: http://support.veritas.com

hasys -state <system_name>  #show state of system
haconf -makerw  # set readwrite mode on the configuration
This touchs a .stale file in the config directory, you can now give 
commands directly to hacf process, when you are finished dump the 
running config in the directory with:

haconf -dump -makero  #this overwrites to old files with new ones.


Make changes to the config files
================================

hastop -all  #stop the cluster


copy main.cf to /etc/VRTSvcs/conf/config #on both machines
hastart 


switch group between nodes


hagrp -switch mail -to sawfish #switch group "mail" to node "sawfish"
hagrp -display mail       # show status

hagrp -offline mail -sys sawfish # take a group offline from a node

debug
=====

make hacf readwrite see above

hatype -modify resource_type LogLevel info (where resource_type is that given in
 types.cf)

hares -display resource_name (where name is given in main.cf after type i.e.

 IP IP_62_84_192_135  IP=resource_type  IP_62_84_192_135=resource_name


hares -online resource_name -sys system_name  #bring resource online
hares -offline resource_name -sys system_name  #bring resource offline

halog -info  # gives whereabouts of log files

Definitions
===========

$VCSHOME/bin/violation  # dir contains script to execute if both systems try to run the same application

main.cf  # contains all config information
types.cf # resource types defined 

daemons:
had     #VCS engine, directs failover etc.

hacf    #executed on demand, translates config lang. adn VCS engine
hashadow # monitors and restart had
agents # 1 agent for each resource type
usercommands # 
GUI # java gui
halink # daemon monitors communication links between cluster members

kernel components 

Low latency transport LLT
GAB  - global message order required to maintain a sync. state
	- can kill had if unresponsive

you should disable any console abort sequence (stop-a)

VCS seeding: a system is unseeded until all systems are up and unseeded or it can talk to a seeded system. When seeded VCS can start.

INSTALLATION CHECKLIST P20 USERS GUIDE

VCS configuration language

create config files by editing them or user haconf to dump config info.
config file contains:

includes   e.g. #include
resource type defs
cluster def
system def
snmp def
service group def
resource def
resource dependency def
service group dependency clauses

attribute data types: 
str - string
int - integer
boolean - 
attribute dimensions:
scalar (value)
vector str Months[] = { jan, feb, mar, apr }
keylist keylist colors { red, yellow, blue }
association Sun=1 Mon=2 Tues=3 

scope 

attribute to all systems is global, per system is local (use @ to indicate the system)

type Mount (
str mountpoint
str type
str MountOpt
str Fsckopt
static str arglist[] { mountpoint, blockdevice, type, mountopt, fsckopt }
namerule = resource.mountpoint )