[ceph-users] CEPH ISCSI LIO multipath change delay

li jerry div8cn at hotmail.com
Tue Mar 19 22:43:04 PDT 2019


I've deployed mimic(13.2.5) cluster on 3 CentOS 7.6 servers, then configured iscsi-target and created a LUN, referring to http://docs.ceph.com/docs/mimic/rbd/iscsi-target-cli/.
I have another server which is CentOS 7.4, configured and mounted the LUN I've just created, referring to http://docs.ceph.com/docs/mimic/rbd/iscsi-initiator-linux/.
I'm trying to do a HA testing:
1. Perform a WRITE test with DD command
2. Stop one 'Activate' iscsi-target node(ini 0), DD IO hangs over 25 seconds until iscsi-target switch to another node
3. DD IO goes back normal
My question is, why it takes so long for the iscsi-target switching? Is there any settings I've misconfigured?
Usually it only take a few seconds to switch on the enterprise storage products.
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