On 06/07/2013 12:55 AM, Bubuli Nayak wrote: > Hello experts, > > I have learnt from MIke and others comment that multipath failover would > be driven by nop timout + nop interval + replacement_timeout seconds. > > My question is what is the impact I set replacement_timeout to 0. I know > if NOPOUT interval is low , more frequently iSCSI initiator would send > the commands. >
It depends on the iscsi tools and kernel version you have. If in iscsid.conf you see the chunk about if the value is 0 it will be failed immediately and you have a recent kernel like 3.0 or newer or distro like RHEL 6 or SLES 11 then if you set it to 0 then it there will be no delay and IO will be failed as soon as we detect a error. # To specify the length of time to wait for session re-establishment # before failing SCSI commands back to the application when running # the Linux SCSI Layer error handler, edit the line. # The value is in seconds and the default is 120 seconds. # Special values: # - 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. > Appreciate any help you can offer. What value you would suggest if I > what multipath to take over as soon as iSCSI target fails. > > Kind regards, > Bubuli > > -- > 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 http://groups.google.com/group/open-iscsi?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > -- 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 http://groups.google.com/group/open-iscsi?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
