On Wednesday, 14 April 2010 01:33:13 UTC+5:30, Mike Christie wrote: > > On 04/13/2010 03:23 AM, Christian Iversen wrote: > > Hi iSCSI guys > > > > I've set up iSCSI storage on our servers, using IETD and OpenISCSI. > > > > It works and performs great, but I am a little unsure of how to adjust > > the timeout values properly. > > > > On our storage servers, we use heartbeat to achieve HA failover, which > > works nicely. However, the client machines only try for a fixed amount > > of time before giving up, so if the failover for some reason does not > > happen relatively quickly, everything grinds to a halt in a really bad > way. > > > > I would like to set up open-iscsi to keep trying, preferably at low > > intervals, and not give up contacting the server. > > > > There are quite a few different timeouts, and I have been unable to find > > any sort of reference documentation for this. Maybe someone here can > help? > > > > Did you read the README? I tried to document the timeouts that are asked > about most frequently on the list. > > > > What I'd like is the following: > > > > - Never give up trying (or at least try for a month :) > > The iscsi initiator almost always tries to reconnect to the target. If > it gets a successful login then that fails it will try to relogin until > the the user runs some iscsiadm command to logout. > > If you mean you want it to hold onto IO and not fail it, then you want > the replacement_timeout/recovery_timeout. There should be info in the > README and iscsid.conf about this. If it is not clear let me know. >
> If in the iscsid.conf you see this for > node.session.timeo.replacement_timeout then this is what I think you are > asking for (that is if you are saying you do not want IO failed) and you > want to set the value to 0. > # - If the value is 0, IO will be failed immediately. > # - If the value is less than 0, IO will remain queued until the session > # is logged back in, or until the user runs the logout command. > > > - Try every 1 second > > - Timeout should work for all stages of the session, > > be it logged in or not. > Even though I changed node.session.timeo.replacement_timeout to 300, It is not updating the value in file /sys/class/iscsi_session/session<id>/recov_tmo because of multipathd service is taking upper hand of iscsi_timeout setting and making it to 5 seconds. Is there anyway to change the value without stopping multipathd service?? > > > > Can anybody help? > > > > Please CC me as I'm not on the list. > > > > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at https://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
