iscsid.conf timeout settings are not being honored
This document (7007358) is provided subject to the disclaimer at the end of this document.
Environment
SUSE Linux Enterprise Server 11 Service Pack 1
Situation
MPIO iSCSI failover is taking two minutes even though the node.session.timeo.replacement_timeout parameter was changed from 120 to 5 in the iscsid.conf file
Resolution
The problem is a configuration issue.
Most iSCSI documentation indicates that the /etc/iscsid.conf should be modified to change timeout values, etc. However, this is for global settings. The "default" configuration file for each initiator is stored under /etc/iscsi/nodes/<target name>/<portal> and overrides settings in the global configuration file.
Example: MPIO iSCSI failover is taking two minutes even though the node.session.timeo.replacement_timeout parameter is set to 5 in the iscsid.conf file.
Solution:
Modify the "node.session.timeo.replacement_timeout" parameter in the default config file for each initiator.
The configuration file to modify is found under /etc/iscsi/nodes/<target name>/<portal>/default
where <target name> is the "iqn" value and "portal" is the IP,port value.
Example:
Initiating a directory listing on:
nts106:~ # ll /etc/iscsi/nodes/iqn.2010-12.lab\:test1/ <-- target name
We see the following two directories:
drw------- 2 root root 4096 2010-12-10 08:39 151.155.134.105,3260,1 <-- portal
drw------- 2 root root 4096 2010-12-10 08:40 192.168.10.1,3260,1 <-- portal
The default config file for each portal is found within its respective portal directory. Notice that "node.session.timeo.replacement_timeout" is set to 120 here. Change it to a lower value....like 5 or so. Make sure to do it for all multipathed initiators/portals!
Most iSCSI documentation indicates that the /etc/iscsid.conf should be modified to change timeout values, etc. However, this is for global settings. The "default" configuration file for each initiator is stored under /etc/iscsi/nodes/<target name>/<portal> and overrides settings in the global configuration file.
Example: MPIO iSCSI failover is taking two minutes even though the node.session.timeo.replacement_timeout parameter is set to 5 in the iscsid.conf file.
Solution:
Modify the "node.session.timeo.replacement_timeout" parameter in the default config file for each initiator.
The configuration file to modify is found under /etc/iscsi/nodes/<target name>/<portal>/default
where <target name> is the "iqn" value and "portal" is the IP,port value.
Example:
Initiating a directory listing on:
nts106:~ # ll /etc/iscsi/nodes/iqn.2010-12.lab\:test1/ <-- target name
We see the following two directories:
drw------- 2 root root 4096 2010-12-10 08:39 151.155.134.105,3260,1 <-- portal
drw------- 2 root root 4096 2010-12-10 08:40 192.168.10.1,3260,1 <-- portal
The default config file for each portal is found within its respective portal directory. Notice that "node.session.timeo.replacement_timeout" is set to 120 here. Change it to a lower value....like 5 or so. Make sure to do it for all multipathed initiators/portals!
Additional Information
iscsiadm is very useful for troubleshooting iSCSI issues, especially if the Yast2 interface does not appear to be functioning correctly.
See man pages for iscsiadm for details.
See man pages for iscsiadm for details.
Disclaimer
This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.
- Document ID:7007358
- Creation Date: 10-Dec-2010
- Modified Date:05-Mar-2021
-
- SUSE Linux Enterprise Server
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