Hi Sam, We use SCST for iSCSI with Ceph, and a pacemaker cluster to orchestrate the management of active/passive presentation using ALUA though SCST device groups. In our case we ended up writing our own pacemaker resources to support our particular model and preferences, but I believe there are a few resources out there for setting this up that you could make use of.
For us it consists of resources for the RBD devices, the iSCSI targets, the device groups and hostgroups for presentation. The resources are cloned across all the cluster nodes, except for the device group resources which are master/slave, with the master becoming the active ALUA member and the others becoming standby or non-optimised. The iSCSI clients see the ALUA presentation and manage it with their own multipathing stacks. There may be ways to do it with LIO now, but at the time I looked at the ALUA support in SCST was a lot better. HTH. Cheers, Adrian From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Samuel Soulard Sent: Wednesday, 9 August 2017 6:45 AM To: ceph-us...@ceph.com Subject: [ceph-users] Iscsi configuration Hi all, Platform : Centos 7 Luminous 12.1.2 First time here but, are there any guides or guidelines out there on how to configure ISCSI gateways in HA so that if one gateway fails, IO can continue on the passive node? What I've done so far -ISCSI node with Ceph client map rbd on boot -Rbd has exclusive-lock feature enabled and layering -Targetd service dependent on rbdmap.service -rbd exported through LUN ISCSI -Windows ISCSI imitator can map the lun and format / write to it (awesome) Now I have no idea where to start to have an active /passive scenario for luns exported with LIO. Any ideas? Also the web dashboard seem to hint that it can get stats for various clients made on ISCSI gateways, I'm not sure where it pulls that information. Is Luminous now shipping a ISCSI daemon of some sort? Thanks all! Confidentiality: This email and any attachments are confidential and may be subject to copyright, legal or some other professional privilege. They are intended solely for the attention and use of the named addressee(s). They may only be copied, distributed or disclosed with the consent of the copyright owner. If you have received this email by mistake or by breach of the confidentiality clause, please notify the sender immediately by return email and delete or destroy all copies of the email. Any confidentiality, privilege or copyright is not waived or lost because this email has been sent to you by mistake. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
