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