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Operating Systems
Linux
Red Hat
FC Luns rescan issue
Post 302951061 by Peasant on Saturday 1st of August 2015 01:35:52 AM
08-01-2015
Moderator
Did you (or someone else) removed or resized any SAN luns from non-working host recently ?
Or did you present a disk with same WWID as in some point in the past (same storage and host lun number, but different size) ?
Did you diff the output from multipath -ll from both hosts ?
If everything is okay (FC/host wise), you can always try rebooting the host that doesn't see the disks, rather then spending hours on fixing stuff like kernel sees lun sized xy and on storage is setuped and presented with different size and similar situations.
Couple of suggestions for future notice :
1. Have names in multipath.conf, it is more user friendly then 'mpathxy' generic name.
If you are creating documentation (you should
), it will be easier to write and maintain it.
2. Create one primary partition when giving disks to services, in this case ASM, don't give whole disks (first sector is for OS usage).
Or did you present a disk with same WWID as in some point in the past (same storage and host lun number, but different size) ?
Did you diff the output from multipath -ll from both hosts ?
If everything is okay (FC/host wise), you can always try rebooting the host that doesn't see the disks, rather then spending hours on fixing stuff like kernel sees lun sized xy and on storage is setuped and presented with different size and similar situations.
Couple of suggestions for future notice :
1. Have names in multipath.conf, it is more user friendly then 'mpathxy' generic name.
If you are creating documentation (you should
), it will be easier to write and maintain it.2. Create one primary partition when giving disks to services, in this case ASM, don't give whole disks (first sector is for OS usage).
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LEARN ABOUT CENTOS
ccs_config_validate
CCS_CONFIG_VALIDATE(8) System Manager's Manual CCS_CONFIG_VALIDATE(8) NAME
ccs_config_validate DESCRIPTION
Usage: ccs_config_validate [options] OPTIONS
-h Print this help, then exit -V Print program version information, then exit -v Produce verbose output Validating XML configuraton files: -f configfile Validate an alternate config file without preloading it with default values. -l configfile Validate an alternate config file with preloading of default values (recommended option). Advanced options: -r Force validation of runtime config -C config_loader Override config plugin loader -t tempfile Force temporay file to tempfile -n Do not remove temporary file -o Overwrite temporary file (dangerous) DEFAULT
Default operation for ccs_config_validate is to load the currently configured environment and verify the outcoming configuration. Example 1: current environment uses a configuration file (/etc/cluster/cluster.conf). The user modifies cluser.conf and executes ccs_config_validate without options. The tool will validate the modified cluster.conf after including default values. Example 2: current environment is set to load the configuration from LDAP. Users modifies LDAP databse and before pushing the change to the nodes, she/he can issue ccs_config_validate to verify the contents o the LDAP database automatically (as long as the correct LDAP environment is set in the cman/cluster sysconfig/defaults files). September 2009 CCS_CONFIG_VALIDATE(8)