Thanks. I'll take a look at the netlink interface. Not using multipath for now, but will do so later.
For basic monitoring of storage network problems, here's what I am thinking: 1. If there is a network failure, eventually cat /sys/block/<disk>/ device/state should show "offline" ? 2. How long will this take? I know that this is a function of replacement_timeout, noop_interval, noop_timeout and scsi timeout, but the relationship is not clear Let us say a=session.timeo.noop_out_interval=5 b=session.timeo.noop_out_timeout=5 c=session.timeo.replacement_timeout=120 d=`cat /sys/block/<disk>/device/timeout`=60 The disk should go offline in a maximum of a+b+c+d=190s after a network failure? If the network comes back up, how soon will the disk state go to 'running' ? Thanks -- solidguy On Sep 10, 12:08 pm, Mike Christie <micha...@cs.wisc.edu> wrote: > On 09/10/2009 12:53 PM, solidguy wrote: > > > Is there a good way to monitor the iscsi sessions for errors? I need > > to report it via SNMP (and perhaps kill the VM running over the > > connection). Right now the only way I see is to monitor syslog -- but > > the syslog doesn't always give me which session (or disk) is in > > trouble. > > You can monitor which sessions have errors by listening on the iscsi > netlink interface. I am not sure if that is very user friendly. You > would have to listen for ISCSI_KEVENT_CONN_ERROR events and filter out > other junk. This does not tell you if a disk has errors though. > > For upstream we are working on a more complete solution for > dm-mutlipath, so it can figure out when session/connections have link > problems or if a disk is offlined by the scsi eh. But right now, I do > not think there is any easy way to do what you need. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to email@example.com To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---