You must perform a rescan operation each time you reconfigure your storage setup.

You can scan by using the vSphere Web Client, the vicfg-rescan vCLI command, or the esxcli storage core adapter rescan command.

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esxcli storage core adapter rescan supports the following additional options.

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-a|--all or -A|--adapter=<string> – Scan all adapters or a specified adapter.

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-S|--skip-claim – Skip claiming of new devices by the appropriate multipath plug-in.

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-F|--skip-fs-scan – Skip filesystem scan.

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-t|--type – Specify the type of scan to perform. The command either scans for all changes (all) or for added, deleted, or updated adapters (add, delete, update).

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vicfg-rescan supports only a simple rescan operation on a specified adapter.

Rescanning a storage adapter with ESXCLI

The following command scans a specific adapter and skips the filesystem scan that is performed by default. 

esxcli <conn_options> storage core adapter rescan --adapter=vmhba33 --skip-claim

The command returns an indication of success or failure, but no detailed information.

Rescanning a storage adapter with vicfg-rescan

Run vicfg-rescan, specifying the adapter name. 

vicfg-rescan <conn_options> vmhba1

The command returns an indication of success or failure, but no detailed information.