John Reddy wrote: > Obviously looking for some help, if any is there to be had. > > Behavior I'm seeing is a log entry stating "ping timeout of 5 secs > expired" then session dropped. Roughly 2 seconds of "Failing > command..." then the session is re-established. (log excerpt below). > This has been caused corruption in the ext3 journal, making the > filesystem go read-only until its fsck'd. > > I'm seeing a few ways this could be debugged, but I'm still new to > iSCSI, so direction would be appreciated. The "ping timeout of 5 sec" > followed by 2 seconds, followed by re-establishing. Is there a > tunable parameter that I missed which would make the system less > vulnerable these inexplicable lags?
In /etc/iscsi.conf there is: ActiveTimeout PingTimeout IdleTimeout If you set these to zero it would turn that off. You can also set it higher to a 30 secs or whatver is safest for your setup. You also might want to consider using dm-multipath over iscsi, and then using dm-multipath's no_path_retry option. > > I still yet to investigate the source of these lags. The system does > push a lot of traffic, ~ 200Mbit/sec sustained over the Gig eth. I've > also looked at updating my ethernet drivers. The Broadcom drivers > have been updated since the version released with SL 4.6 The initiator will send the target a iscsi ping every ActiveTimeout seconds if IO is running (if no IO is running it will send it every IdleTimeout). If the initiator does not get a response to the nop within PingTimeout seconds you get the Ping timeout failover. If then that happens 5 times to the same command it is failed to the FS and you get the FS errors. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to firstname.lastname@example.org To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---