ODA : "directio checker" reports path Up/Down in /var/log/messages file

Asset ID:	1-71-1611143.1
Update Date:	2014-01-22
Keywords:

Solution Type Technical Instruction Sure

Solution 1611143.1 : ODA : "directio checker" reports path Up/Down in /var/log/messages file

Applies to:

Oracle Database Appliance - Version All Versions and later
Information in this document applies to any platform.

Goal

In the /var/log/messages file there are messages reported: "directio checker reports path is Up/Down"

For example:

Oct 15 09:21:44 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:21:44 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down
Oct 15 09:21:49 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:21:49 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down
Oct 15 09:21:54 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:21:54 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down
Oct 15 09:21:59 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:21:59 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down
Oct 15 09:22:04 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:22:04 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down
Oct 15 09:22:10 multipathd: HDD_E0_S12_1200440059: sdf - directio checker reports path is down
Oct 15 09:22:10 multipathd: HDD_E0_S12_1200440059: sdap - directio checker reports path is down

Solution

On ODA the path_checker process checks the mutlipath status of the disks, not directio checker; therefore the multipath.conf file should have a 'path_checker tur' entry to prevent this.

This will be fixed in ODA version 2.9.

For versions prior to 2.9, add 'path_checker tur' line to /etc/multipath.conf on both nodes, then issue 'service multipathd restart' to enable:

1. Add 'path_checker tur' line to /etc/multipath.conf:

defaults {
user_friendly_names yes
path_grouping_policy multibus
failback manual
no_path_retry fail
flush_on_last_del yes
queue_without_daemon no
path_checker tur <======
}

2. Restart multipathd service:

# service multipathd restart

Verify the /var/log/messages file does not contain any new message lines with "directio checker reports path".

References

<BUG:17630696> - MASSIVE MULTIPATH FAILURE ON ODA
<BUG:17663704> - LNX64-112-CMT: DISK OFFLINED/DROPPED FREQUENTLY
<BUG:17641717> - LNX64-112-CMT:NEED TO HAVE PATH_CHECKER TUR IN /ETC/MULTIPATH.CONF FILE

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