samba - Oct 2016 - a question about tdb record backup for ctdb failover

sun yekuan via samba <samba at lists.samba.org> writes:
> OK, thank you!  I have another question:
>
> what the current CTDB have done for transparent failover ? achieved  fully
or partially?
> if CTDB has not achieved fully,  what else we should do ?
Fully transparent failover not only a ctdb task. Samba is involved
too. We need persistent file handles with guarantees, a task that is not
done yet.

See https://wiki.samba.org/index.php/Samba3/SMB3#Persistent_File_Handles
for ideas.

With best regards,

Volker Lendecke

ok, thank you!

Except witness, what else should CTDB do for supportting transparent failover?

With best regards

From: Volker Lendecke<mailto:vl at samba.org>
Date: 2016-10-11 15:24
To: sun yekuan via samba<mailto:samba at lists.samba.org>
CC: Amitay Isaacs<mailto:amitay at gmail.com>; sun
yekuan<mailto:sunyekuan at outlook.com>
Subject: Re: [Samba] a question about tdb record backup for ctdb failover
sun yekuan via samba <samba at lists.samba.org> writes:
> OK, thank you!  I have another question:
>
> what the current CTDB have done for transparent failover ? achieved  fully
or partially?
> if CTDB has not achieved fully,  what else we should do ?
Fully transparent failover not only a ctdb task. Samba is involved
too. We need persistent file handles with guarantees, a task that is not
done yet.

See https://wiki.samba.org/index.php/Samba3/SMB3#Persistent_File_Handles
for ideas.

With best regards,

Volker Lendecke

sun yekuan <sunyekuan at outlook.com> writes:
> ok, thank you!
>
> Except witness, what else should CTDB do for supportting transparent
> failover?
ctdb needs to develop a database model to distribute persistent handle
information across nodes. For larger clusters, this will probably also
require to introduce failover groups, you don't want to broadcast
persistent handle information everywhere. This needs to be developed
closely together with Samba, because right now Samba has no notion of
persistent handles. As you know, patches for persistent handles are
already floating around on the lists, but these need to be polished and
integrated into Samba.

Volker