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.
Can anybody help?
Please CC me as I'm not on the list.
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