25.3 Stages of a Rolling Upgrade

25.3 Stages of a Rolling Upgrade

A rolling upgrade of a cluster is accomplished through an ordered series of stages. These stages are represented in Table 25-2.

Table 25-2: Rolling Upgrade Stages

Rolling Upgrade Stage
Stage	Description of Tasks to be Performed	Runlevel	Member	Time
Preparation	Backup the Cluster.	single-user or multi-user	Any	Time can vary greatly according size and number of file systems that are required to be backed up.
	Choose a Lead Member for Rolling Upgrade.	multi-user
	Undate Firmware.	console	lead
	#clu_upgrade-vc check setup 1	multi-user
setup	#clu_upgrade -v check setup 1	multi-user	lead	45 - 120 minutes
	Reboot all cluster members eccept the lead member.		All but the Lead
Preinstall	#clu_upgrade preinstall	multi-user	Lead	15 - 30 minutes
Install	#clu_upgrade install	multi-user	Lead	30 - 120 mintues
	Update Installation (installupdate) and/or	single-user
	New Hardware Delivery (NHD) kit installation (nhd_install) and/or	single-user
	Patch kit installation (dupatch)	single-user or multi-user
Postintall	# clu_upgrade postinstall	multi-user	Lead	<1 minute
Roll	one member at a time, shutdown the system.	console	All but the Lead	15 - 30 minutes per cluster memnber
	Update the firware.
	Boot to single-user mode.
	while in single-user mode #bcheckrc #update #swapon -a #clu_upgrade roll	single-user
Switch	On any member, run "clu_upgrade switch"	multi-user	Any	<1 minute
	Reboot all members one at a time.		All	Normal reboot time.
Clean	On any member, run "clu_upgrade clean"	multi-user	Any	30 - 90 minutes
Undo	Prior to the switch step, any or all steps can be undone. See section 25.6 for more information.	multi-user	varies according step being undone.	varies according step being undone.

The times specified in this table are approximate and depend on the speed of the system, the speed of the storage, and whether or not the command is being executed on the CFS server (for the cluster_root (or /), cluster_usr or (/usr), and cluster_var (or /var) file systems). Please also note that the time required for the Setup Stage can be quite lengthy (beyond 120 minutes) – depending on the number of nodes in your cluster. The reason for this is that copies of all system level files are made on disk.