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Enhance multipathing documentation for XCP-ng #462

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Enhance multipathing documentation for XCP-ng #462

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8 changes: 8 additions & 0 deletions docs/storage/multipathing.md
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Expand Up @@ -194,6 +194,14 @@ Proceed with the iSCSI SR configuration as indicated in the [storage documentati
* Multiple targets per LUN on your storage unit.
* Zoning performed.

:::info
Multipath in XCP-ng is managed by the Storage Manager layer. Multipath devices are created **only** for LUNs that are actively used by Storage Manager. As a result, ```multipath -ll``` will show devices only after [HBA SR](../../storage/#hba) has been created.

Storage Manager also controls ```/etc/multipath/wwids``` content. Do not edit this file manually and do not add entries with ```multipath -a```.

To verify that LUN paths are visible on the host before a multipath device is created, use ```multipathd show paths format "%w %d %p %P %R %r %n"```.
:::

:::warning
Make sure not to mix Fibre Channel speeds.
:::
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