How to Mount a Data store in ESX Server ?

You need to use the esxcfg-volume command. It can be used in this way:

• Execute this command to list the volumes that are detected as snapshots/replicas:
  
  # esxcfg-volume -l
  
  The output appears similar to:
  
  VMFS3 UUID/label: 49d22e2e-996a0dea-b555-001f2960aed8/VMFS_1
  Can mount: Yes
  Can resignature: Yes
  Extent name: naa.60a98000503349394f3450667a744245:1 range: 0 - 97023 (MB)
  
  Here the Datastore UUID is 49d22e2e-996a0dea-b555-001f2960aed8 and its last label is VMFS_1.
  
  
• To mount the volume without performing a resignaturing of that volume (this volume is unmounted when the ESX host is rebooted), run this command:
  
  # esxcfg-volume -m
  
  For example:
  
  # esxcfg-volume -m "VMFS_1"
  # esxcfg-volume -m "49d22e2e-996a0dea-b555-001f2960aed8"
  
  
• To mount the volume without performing a resignaturing of that volume (this volume is mounted when the ESX host is rebooted), run this command:
  
  # esxcfg-volume -M
  
  For example:
  
  # esxcfg-volume -M "VMFS_1"
  # esxcfg-volume -M "49d22e2e-996a0dea-b555-001f2960aed8"
  
  
• Run this command to resignature the volume (the volume is mounted immediately after the resignature):
  
  # esxcfg-volume -r
  
  For example:
  
  # esxcfg-volume -r "VMFS_1"
  # esxcfg-volume -r "49d22e2e-996a0dea-b555-001f2960aed8"