sun yekuan
2016-Oct-10 07:03 UTC
[Samba] a question about tdb record backup for ctdb failover
hello everyone: I want to know if the lastest version of ctdb has the following mechanism: when a record in tdb was added or upadted, if there are two same record in different nodes.In other words, if ctdb need to backup a record on other node? if not, do we plan to add this mechanism? thank you ! ________________________________ sunyekuan at outlook.com
Amitay Isaacs
2016-Oct-10 13:17 UTC
[Samba] a question about tdb record backup for ctdb failover
On Mon, Oct 10, 2016 at 6:03 PM, sun yekuan via samba <samba at lists.samba.org> wrote:> hello everyone: > > I want to know if the lastest version of ctdb has the following mechanism: > when a record in tdb was added or upadted, if there are two same record in > different nodes.In other words, if ctdb need to backup a record on other > node? > > if not, do we plan to add this mechanism? > > thank you ! >CTDB already replicates records to other nodes and performs database recovery on failover. What exactly are you trying to do? Amitay.
sun yekuan
2016-Oct-11 06:39 UTC
[Samba] a question about tdb record backup for ctdb failover
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 ? thank you! best wishes! From: Amitay Isaacs<mailto:amitay at gmail.com> Date: 2016-10-11 13:43 To: sun yekuan<mailto:sunyekuan at outlook.com> Subject: Re: Re: [Samba] a question about tdb record backup for ctdb failover On Tue, Oct 11, 2016 at 3:34 PM, sun yekuan <sunyekuan at outlook.com<mailto:sunyekuan at outlook.com>> wrote: thank you for your answer! As i know, the latest record was stored in DMASTER node. When the LMASTER and DMASTER are all dead because of some reasons, TDB will not recovery to the lastest. what i exactly want to know is that when a record was store in DMASTER, can other nodes have the copy of the record? can CTDB guarantee no data lose? thank you very much! Volatile database data model is designed to be lossy. If a node goes away, all the SMB clients connected to that node also go away and any changes made in TDB record are not relevant. If you want persistent data, then you should use persistent database. Amitay.
Volker Lendecke
2016-Oct-11 07:24 UTC
[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
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