10-27-2009
Question about HACMP for active-active mode
Hi all,
I am new to HACMP. So sorry for the newie question. But I did search the forum and it seems that no one asks this before.
So if a 2-node cluster runs in active-active mode (and the same application), what is the benefit of using HACMP ?
If it runs in active-stanby, it is easy to understand because you need HACMP to do failover; but for active-active mode, no failover (right ?), then why do we need HACMP ?
Besides, I find HACMP documents do not use the term "active-active" or "active-standby" (cold standby or hot standby) often. So does "concurrent resource group" mean "active-active" and "cascading/rotating resource group" mean "active-standby" ? Is there a cold standby ?
And what is the relation between "concurrent resource group" and "concurrent shared disk access"; what's the relation between "Cascading/Rotating resource group" and "non-concurrent shared disk access" ?
Thanks!
Last edited by qiulang; 10-27-2009 at 09:18 AM..
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LEARN ABOUT CENTOS
crm_ticket
PACEMAKER(8) System Administration Utilities PACEMAKER(8)
NAME
Pacemaker - Part of the Pacemaker cluster resource manager
SYNOPSIS
crm_ticket (query|command) [options]
DESCRIPTION
crm_ticket - Perform tasks related to cluster tickets. Allows ticket attributes to be queried, modified and deleted.
OPTIONS
-?, --help
This text
-$, --version
Version information
-V, --verbose
Increase debug output
-Q, --quiet
Print only the value on stdout
-t, --ticket=value
Ticket ID
Queries:
-l, --info
Display the information of ticket(s)
-L, --details
Display the details of ticket(s)
-w, --raw
Display the IDs of ticket(s)
-q, --query-xml
Query the XML of ticket(s)
-c, --constraints
Display the rsc_ticket constraints that apply to ticket(s)
Commands:
-g, --grant
Grant a ticket to this cluster site
-r, --revoke
Revoke a ticket from this cluster site
-s, --standby
Tell this cluster site this ticket is standby
-a, --activate
Tell this cluster site this ticket is active
Advanced Commands:
-G, --get-attr=value
Display the named attribute for a ticket
-S, --set-attr=value
Set the named attribtue for a ticket
-D, --delete-attr=value
Delete the named attribute for a ticket
-C, --cleanup
Delete all state of a ticket at this cluster site
Additional Options:
-v, --attr-value=value
Attribute value to use with -S
-d, --default=value
(Advanced) The default attribute value to display if none is found. For use with -G
-f, --force
(Advanced) Force the action to be performed
-n, --set-name=value
(Advanced) ID of the instance_attributes object to change
-i, --nvpair=value
(Advanced) ID of the nvpair object to change/delete
EXAMPLES
Display the info of tickets:
# crm_ticket --info
Display the detailed info of tickets:
# crm_ticket --details
Display the XML of 'ticketA':
# crm_ticket --ticket ticketA --query-xml
Display the rsc_ticket constraints that apply to 'ticketA':
# crm_ticket --ticket ticketA --constraints
Grant 'ticketA' to this cluster site:
# crm_ticket --ticket ticketA --grant
Revoke 'ticketA' from this cluster site:
# crm_ticket --ticket ticketA --revoke
Make 'ticketA' standby:
The cluster site will treat a granted 'ticketA' as 'standby'. The dependent resources will be stopped or demoted gracefully without trig-
gering loss-policies
# crm_ticket --ticket ticketA --standby
Activate 'ticketA' from being standby:
# crm_ticket --ticket ticketA --activate
Get the value of the 'granted' attribute for 'ticketA':
# crm_ticket --ticket ticketA --get-attr granted
Set the value of the 'standby' attribute for 'ticketA':
# crm_ticket --ticket ticketA --set-attr standby --attr-value true
Delete the 'granted' attribute for 'ticketA':
# crm_ticket --ticket ticketA --delete-attr granted
Erase the operation history of 'ticketA' at this cluster site:
The cluster site will 'forget' the existing ticket state.
# crm_ticket --ticket ticketA --cleanup
AUTHOR
Written by Andrew Beekhof
REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org
Pacemaker 1.1.10-29.el7 June 2014 PACEMAKER(8)