My goal is to make,for testing purposea multipath lvm iscsiI have setup two debianiscsi server,workingsI have setup the multipath ona debian client and i cancreate dirs,etc on ext4 fs.But if server1 goes downthe fs is stucked(hang)Why?This is my multipath.confdefaults {         udev_dir                /dev         polling_interval        5         path_grouping_policy    multibus         path_checker            directio         prio                    const         rr_min_io               100         rr_weight               priorities         failback                immediate         no_path_retry           fail}blacklist {         devnode ^(ram|sda|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*         devnode ^hd[a-z][[0-9]*]         devnode ^vd[a-z]         devnode ^cciss!c[0-9]d[0-9]*[p[0-9]*]}multipaths {         multipath {                 wwid 149455400000000009d1b03a0217052c8b19b0fa6e5bfe7bd                 alias iscsi_storage         }}
Linux and iscsi multipath
multipath storage
The answer is: not possibleDual-primary DRBD, iSCSI, and multipath: Dont Do That!Dual-primary iSCSI targets for multipath: does not work. iSCSI is a  stateful protocol, there is more to it that than just reads and  writes. To run multipath (or multi-connections per session) against  distinct targets on separate nodes youd need to have cluster aware  iSCSI targets which coordinate with each other in some fashion. To my  knowledge, this does not exist (not for Linux, anyways).