<[sambabg]

==== ====[plain]

<[center]
\Large
'''Outlook: clustering / witness'''
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==== Witness - General ====

* New DCE/RPC Service to “witness” availability of IPs, shares, ...
* ==> Faster fail-over of clients in the cluster
* Prompt, explicit, and controlled notifications about failures \ %
  (CTDB tickle-ACKs are implicit)
* Available since SMB3 (Windows 8 / Windows Server 2012)

==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====

-<1>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step0.png, width=.95\textwidth>>>
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}

-<2>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step1.png, width=.95\textwidth>>>
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}

-<3>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step2a.png, width=.95\textwidth>>>
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}

-<4>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step2b.png, width=.95\textwidth>>>
[center]>
}

-<5>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step3a.png, width=.95\textwidth>>>
[center]>
}

-<6>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step3b.png, width=.95\textwidth>>>
[center]>
}

-<7>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step4.png, width=.95\textwidth>>>
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}

-<8>{
<[center]
<<<design-ctdb-three-nodes-with-witness-step5.png, width=.95\textwidth>>>
[center]>
}

==== Witness - Samba ====

<[block]{Currently under development in Samba}
* PoC implementation available
* TODO(wip): new _red_async_ DCE/RPC infrastructure
* {\footnotesize @https://wiki.samba.org/index.php/Samba3/ \\ %
   SMB2\#Witness\_Notification\_Protocol@}
* WIP branch: \\ %
  {\footnotesize @https://git.samba.org/?p=gd/samba/.git;a=shortlog; \\ %
   h=refs/heads/master-witness@}
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<[block]{Samba Witness service will cause Windows clients to reconnect...}
* when client admin tool is used
* when CTDB (or any other cluster resource control manager) moves resources or IP addresses
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