----- Original Message -----
From: "Chris Jones - BookIt.com Systems Administrator" <chris.jones@bookit.com> To: users@ovirt.org Sent: Friday, May 22, 2015 8:55:37 PM Subject: Re: [ovirt-users] oVirt Instability with Dell Compellent via iSCSI/Multipath
Is there maybe some IO problem on the iSCSI target side? IIUIC the problem is some timeout, which could indicate that the target is overloaded.
Maybe. I need to check with Dell. I did manage to get it to be a little more stable with this config.
defaults { polling_interval 10 path_selector "round-robin 0" path_grouping_policy multibus getuid_callout "/usr/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/%n" path_checker readsector0 rr_min_io_rq 100 max_fds 8192 rr_weight priorities failback immediate no_path_retry fail user_friendly_names no
You should keep the default without change, and add specific settings under the device section.
} devices { device { vendor COMPELNT product "Compellent Vol" path_checker tur no_path_retry fail
This is mostly likely missing some settings. You are *not* getting the settings from the "defaults" section above. For example, since you did not specify here "failback immediate", failback for this device defaults to whatever default multipath chose, not the value set in "defaults" above.
} }
I referenced it from http://en.community.dell.com/techcenter/enterprise-solutions/w/oracle_soluti.... I modified it a bit since that is Red Hat 5 specific and there have been some changes.
It's not crashing anymore but I'm still seeing storage warnings in engine.log. I'm going to be enabling jumbo frames and talking with Dell to figure out if it's something on the Compellent side. I'll update here once I find something out.
Lets continue this on bugzilla. See also this patch: https://gerrit.ovirt.org/41244 Nir