Modifying properties to use scsi-3 reservation for disks with two paths in sun cluster Post: 302954186

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Operating Systems Solaris Modifying properties to use scsi-3 reservation for disks with two paths in sun cluster Post 302954186 by sb200 on Saturday 5th of September 2015 06:41:23 AM

09-05-2015

Registered User

Thanks for the input Hicksb8. I am doing this on my practice cluster luns are iscsi based.

I am just trying to implement the SCSI3 reservation on two path devices in cluster.

In first logs I just wanted to change the global_ default fencing to prefer3 mean scsi3 where it change all the reservation of shared disks from scsi2 to scsi3 except quorum device d6 which have I have to change it manually by adding d4 device as quorum (while adding this d4 device(Scsi3) in cluster, my command got hanged ). If my command didn't got hanged & went smoothly then remove the d6 from quorum device control then change the default_fencing parameter of device d6 to global from pathcount . After this I wanted to add the d6 in quorum device. & remove the d4 from quorum control. As in two node cluster we cannot directly remove the d6 (single)quorum device due to quorum of the server will be compromised untill & unless we put the cluster in installedmode which I did in seconds logs.

In both the above logs/procedure you will notice I am trying to add disk which is having scsi 3 reservation. Is due to adding the scsi3 reservation disk in quorum control my cluster got hanged both the times in above mention both logs meaning even simple "clq status" got hanged then I need to take the cluster reboot . As per my knowledge only these two process are to implement scsi3 reservation on two path devices.

My cluster is 3.2 & kindly let me know is their any way to implement scsi3 reservation on two path devices including quorum device.

Last edited by sb200; 09-05-2015 at 08:12 AM.. Reason: Wanted to add more information for clearity

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LEARN ABOUT SUSE

ocf_heartbeat_scsi2reservation

OCF_HEARTBEAT_SCSI2R(7) 					OCF resource agents					   OCF_HEARTBEAT_SCSI2R(7)

NAME

       ocf_heartbeat_scsi2reservation - scsi-2 reservation

SYNOPSIS

       scsi2reservation [start | stop | monitor | meta-data | validate-all]

DESCRIPTION

       The scsi-2-reserve resource agent is a place holder for SCSI-2 reservation. A healthy instance of scsi-2-reserve resource, indicates the
       own of the specified SCSI device. This resource agent depends on the scsi_reserve from scsires package, which is Linux specific.

SUPPORTED PARAMETERS

       scsi_reserve
	   The scsi_reserve is a command from scsires package. It helps to issue SCSI-2 reservation on SCSI devices. (optional, string, default
	   /usr/sbin/scsi_reserve)

       sharedisk
	   The shared disk that can be reserved. (optional, string, default /dev/sdb)

       start_loop
	   We are going to try several times before giving up. Start_loop indicates how many times we are going to re-try. (optional, string,
	   default 10)

SUPPORTED ACTIONS

       This resource agent supports the following actions (operations):

       start
	   Starts the resource. Suggested minimum timeout: 300.

       stop
	   Stops the resource. Suggested minimum timeout: 100.

       monitor
	   Performs a detailed status check. Suggested minimum timeout: 20. Suggested interval: 20.

       meta-data
	   Retrieves resource agent metadata (internal use only). Suggested minimum timeout: 5.

       validate-all
	   Performs a validation of the resource configuration. Suggested minimum timeout: 30.

EXAMPLE

       The following is an example configuration for a scsi2reservation resource using the crm(8) shell:

	   primitive example_scsi2reservation ocf:heartbeat:scsi2reservation 

	     op monitor depth="0" timeout="20" interval="20"

SEE ALSO

       http://www.linux-ha.org/wiki/scsi2reservation_(resource_agent)

AUTHOR

       Linux-HA contributors (see the resource agent source for information about individual authors)

resource-agents 1.0.3						    07/05/2010						   OCF_HEARTBEAT_SCSI2R(7)