В Mon, 18 Aug 2014 18:56:44 +0200
steve
On Mon, 2014-08-18 at 13:16 +0200, Kai Dupke wrote:
On 08/18/2014 10:51 AM, steve wrote:
Thanks for the input. It's not performance we want. We're never going to get that. It's reliability. What do you mean by fail over? I think we already have that. If one node fails, there is always the other one already up. If you mean have only one node available at a time, what's the advantage of that? Also, how are we going to serve a windows domain without ctdb?
I assume you can handle a windows domain with Samba and don't need CTDB?
fail-over means to have samba either running on A xor B.
The advantage is noOCFS2, which means less communication overhead and less complex setup.
'Already the other is up' does not help really as CTDB does not provide a transparent fail-over for a client connection AFIK. The time the system needs to identify the issue and switch from node A to B isn't that long. Usually it isn't an issue if not happens multiple times a week.
I'm not sure what you mean by transparent fail-over.
After failover TCP connection is broken and client has to reconnect. Depending on client application it may have more or less impact (Windows Explorer will probably reconnect; database will likely crash). It has nothing to do with server, but simply with the way SMB works and was the same also using Windows Server cluster. There is limited support for durable/persistent shares in SMB 3.0, do not know whether SAMBA implements it.
Do you mean that the IP is not taken over without user intervention? Or that smbd on the other node does not take over the share? Both, or something else?
What do your SLES tests show? Thanks, L x
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