From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 13:54:28 +0200
Subject: Adding upstream version 18.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 doc/rbd/iscsi-initiator-win.rst | 102 ++++++++++++++++++++++++++++++++++++++++
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 create mode 100644 doc/rbd/iscsi-initiator-win.rst

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+-------------------------------------
+iSCSI Initiator for Microsoft Windows
+-------------------------------------
+
+**Prerequisite:**
+
+-  Microsoft Windows Server 2016 or later
+
+**iSCSI Initiator, Discovery and Setup:**
+
+#. Install the iSCSI initiator driver and MPIO tools.
+
+#. Launch the MPIO program, click on the "Discover Multi-Paths" tab, check the
+   "Add support for iSCSI devices” box, and click "Add". This will require a
+   reboot.
+
+#. On the iSCSI Initiator Properties window, on the "Discovery" tab, add a target
+   portal. Enter the IP address or DNS name and Port of the Ceph iSCSI gateway.
+
+#. On the “Targets” tab, select the target and click on “Connect”.
+
+#. On the “Connect To Target” window, select the “Enable multi-path” option, and
+   click the “Advanced” button.
+
+#. Under the "Connect using" section, select a “Target portal IP” . Select the
+   “Enable CHAP login on” and enter the "Name" and "Target secret" values from the
+   Ceph iSCSI Ansible client credentials section, and click OK.
+
+#. Repeat steps 5 and 6 for each target portal defined when setting up
+   the iSCSI gateway.
+
+**Multipath IO Setup:**
+
+Configuring the MPIO load balancing policy, setting the timeout and
+retry options are using PowerShell with the ``mpclaim`` command. The
+rest is done in the iSCSI Initiator tool.
+
+.. note::
+  It is recommended to increase the ``PDORemovePeriod`` option to 120
+  seconds from PowerShell. This value might need to be adjusted based
+  on the application. When all paths are down, and 120 seconds
+  expires, the operating system will start failing IO requests.
+
+::
+
+    Set-MPIOSetting -NewPDORemovePeriod 120
+
+::
+
+    mpclaim.exe -l -m 1
+
+::
+
+    mpclaim -s -m
+    MSDSM-wide Load Balance Policy: Fail Over Only
+
+#. Using the iSCSI Initiator tool, from the “Targets” tab, click on
+   the “Devices...” button.
+
+#. From the Devices window, select a disk and click the
+   “MPIO...” button.
+
+#. On the "Device Details" window the paths to each target portal is
+   displayed. If using the ``ceph-ansible`` setup method, the
+   iSCSI gateway will use ALUA to tell the iSCSI initiator which path
+   and iSCSI gateway should be used as the primary path. The Load
+   Balancing Policy “Fail Over Only” must be selected
+
+::
+
+    mpclaim -s -d $MPIO_DISK_ID
+
+.. note::
+  For the ``ceph-ansible`` setup method, there will be one
+  Active/Optimized path which is the path to the iSCSI gateway node
+  that owns the LUN, and there will be an Active/Unoptimized path for
+  each other iSCSI gateway node.
+
+**Tuning:**
+
+Consider using the following registry settings:
+
+-  Windows Disk Timeout
+
+   ::
+
+       HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Disk
+
+   ::
+
+       TimeOutValue = 65
+
+-  Microsoft iSCSI Initiator Driver
+
+   ::
+
+       HKEY_LOCAL_MACHINE\\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-BFC1-08002BE10318}\<Instance_Number>\Parameters
+
+   ::
+   
+       LinkDownTime = 25
+       SRBTimeoutDelta = 15
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