Applies To:
Oracle Database Oracle 12cR1 12.1.0.1.0 Enterprise Edition
Operating System(s) Red Hat Enterprise Linux with kernel 2.6.32-431.el6.x86_64
Storage EqualLogic Storage Array PS6110
Problem:
How to configure multipath for EqualLogic Storage Array PS6110?
Solution:
Device mapper multipath utility is used to achieve consistent naming of shared volumes across all nodes in a RAC set up.
The four components of a multipath configuration file are:
- blacklist
- blacklist exceptions
- defaults &
- multipaths
The wiki article How to configure device-mapper-multipathprovides the steps involved in configuring the /etc/multipath.conf file. However for the purpose of deploying the Oracle RAC12cR1 on RHEL 6.5, with EqualLogic PS6110 as the storage, the defaults section of the multipath configuration file needs to have the values given below:
defaults {
udev_dir /dev
polling_interval 10
path_selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
prio alua
path_checker tur
rr_min_io 100
max_fds 8192
rr_weight priorities
failback immediate
no_path_retry fail
user_friendly_names yes
}