We inherited a Oracle Linux 6.5 server with a multipathing problem. It's connected to a FAS3170 HA pair, 8.1.3P1 7-mode, with 2xQLE2560 HBAs. ALUA is enabled on the igroups, SAN zoning looks correct, but all I/O traverses one HBA and one target port on the NetApp. This is causing a lot of traffic to traverse the vtic and "FCP partner path mismatch" errors.
On the server, we see multipathd errors getting device and ioctl errors "adding target to table." multipath -ll output looks like this:
I notice that user_friendly_names is set to "yes" where best practice is "no." I want to change this, but I don't know if this is the problem.
Are the multipath.conf defaults and device section necessary anymore in after 6.4? The HUK 6.2 Installation and Setup Guide and Recommended Host Settings aren't clear. The Install Guide makes it seem the blacklist is all that's needed. The SnapDrive 5.2.2 documentation is clear on pages 131-132 : You do not have to set any values in the /etc/multipath.conf file if you are using either Red Hat Enterprise Linux (RHEL) 6.4 or later or Oracle Linux 6.4 or later. However, SnapDrive for UNIX configuration you must still maintain a dummy /etc/multipath.conf file, which can either be empty or contain the blacklisting info, if required.
Do these errors look like a multipath.conf problem?
Thank you for reading and any advice would be appreciated.