On 04/05/2015 11:22 AM, Nick Fisk wrote:
Hi Justin,
I'm doing iSCSI HA. Myself and several others have had troubles with LIO and
Ceph, so until the problems are fixed, I wouldn't recommend that approach.
But hopefully it will become the best solution in the future.
If you need iSCSI, currently the best method is probably: Shared IP
failover +TGT with RBD backend
By default TGT won't be able to fail between cluster nodes if there are IOs
in progress, so you might need to get creative to overcome this.
The other option, if it meets your requirements is NFS with a shared
failover IP.
Nick
Mike Christie has been actively working on iSCSI support with HA. Worth
comparing notes :)
ric
-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of
Eric Eastman
Sent: 05 April 2015 02:37
To: Justin Chin-You
Cc: Ceph Users
Subject: Re: Understanding High Availability - iSCSI/CIFS/NFS
You may want to look at the Clustered SCSI Target Using RBD Status
Blueprint, Etherpad and video at:
https://wiki.ceph.com/Planning/Blueprints/Hammer/Clustered_SCSI_target
_using_RBD
http://pad.ceph.com/p/I-scsi
https://www.youtube.com/watch?v=quLqLnWF6A8&index=7&list=PLrBUGiI
NAakNGDE42uLyU2S1s_9HVevK-
Eric
On Sat, Apr 4, 2015 at 7:30 AM, Justin Chin-You <justin.chinyou@xxxxxxxxx>
wrote:
Hi All,
Hoping someone can help me understand CEPH HA or point me in the
direction of a doc I missed.
I understand how CEPH HA itself works in regards to PG, OSD and
Monitoring. However what isn't clear for me is the failover in regards to
things like iSCSI and the not yet production ready CIFS/NFS.
Scenario:
I have 2 servers that are peered and running CEPH and I am replicating
between both. Using CEPH I have iSCSI targets and CIFS/NFS stores.
In the event a server should fail how are iSCSI Initiators and CIFS/NFS
clients
re-directed? I am assuming Multipath and Virtual IPs but I can't figure
out if
this is something I need to configure/run on the OS side or if it is in
CEPH
itself.
Any help appreciated!
Thanks!
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