smb3.wiki

   1 ==== SMB3 ====
   2
   3 Improvements of SMB3 over SMB2 include:
   4 * Transport encryption
   5 * SMB Direct (SMB over RDMA)
   6 * SMB Multichannel (multiple connections per session)
   7 * Witness Service (connection monitoring and transparent failover)
   8
   9
  10 ==== SMB Features - in Samba ====
  11
  12 * SMB 2.0:
  13 ** durable file handles [4.0]
  14 * SMB 2.1:
  15 ** multi-credit / large mtu [4.0]
  16 ** dynamic reauthentication [4.0]
  17 ** leasing [4.2]
  18 ** resilient file handles [PoC]
  19 * SMB 3.0:
  20 ** new crypto (sign/encrypt) [4.0]
  21 ** secure negotiation [4.0]
  22 ** durable handles v2 [4.0]
  23 ** persistent file handles [planning/PoC]
  24 ** multi-channel [WIP++ (4.4...)]
  25 ** SMB direct [designed/starting]
  26 ** cluster features [designing]
  27 *** witness [WIP+]
  28 ** storage features [WIP]
  29 * SMB 3.1.1:
  30 ** basic support [4.3]
  31
  32
  33 ==== Witness - General ====
  34
  35 New DCE/RPC Service to “witness” availability of other services, in particular SMB3 connections
  36 * Prompt and explicit notifications about failures in highly available systems
  37 * Allows Continuous Availability of SMB shares in clustered environments (together with persistent handles)
  38 * Controlled way of dealing with reconnects instead of detecting failures due to timeouts
  39 * Available since SMB3 (Windows 8 / Windows Server 2012)
  40 * More advanced failover mechanism than Tickle-ACK that is used within CTDB
  41
  42 ==== Witness - Samba ====
  43
  44 Currently under development in Samba
  45 * PoC implementation available, currently development on hold until new DCE/RPC async infrastructure is available
  46 * WIP branch: \\ %
  47   https://git.samba.org/?p=gd/samba/.git;a=shortlog;h=refs/heads/master-witness
  48
  49 Samba Witness service will cause Windows clients to reconnect:
  50 * when client admin tool is used
  51 * when CTDB (or any other cluster resource control manager) moves resources or IP addresses
  52
  53 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  54
  55 <[center]
  56 <<<design-ctdb-three-nodes-with-witness-step0.png, width=.95\textwidth>>>
  57 [center]>
  58
  59 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  60
  61 <[center]
  62 <<<design-ctdb-three-nodes-with-witness-step1.png, width=.95\textwidth>>>
  63 [center]>
  64
  65 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  66
  67 <[center]
  68 <<<design-ctdb-three-nodes-with-witness-step2.png, width=.95\textwidth>>>
  69 [center]>
  70
  71 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  72
  73 <[center]
  74 <<<design-ctdb-three-nodes-with-witness-step3.png, width=.95\textwidth>>>
  75 [center]>
  76
  77 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  78
  79 <[center]
  80 <<<design-ctdb-three-nodes-with-witness-step4.png, width=.95\textwidth>>>
  81 [center]>
  82
  83 ==== Witness - Failover with SMB3 in a Samba/CTDB cluster ====
  84
  85 <[center]
  86 <<<design-ctdb-three-nodes-with-witness-step5.png, width=.95\textwidth>>>
  87 [center]>