Timeout when trying to mount datastore

Products

• VMware vSphere ESXi

Issue/Introduction

A LUN is visible to an ESXi host but unable to mount datastore on LUN.

Attempting to mount the datastore from the command line returns a timeout message.

Environment

VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x

Cause

The LUN is a deactivated snapshot LUN. A deactivated snapshot LUN fails to mount because it is read only.

/var/log/vmkernel.log may report I/O errors against the LUN.

ScsiDeviceIO: 4176: Cmd(0x45d94174fa88) 0x28, CmdSN 0x7175 from world 0 to dev "naa.####" failed H:0x0 D:0x2 P:0x2
Partition: 437: Failed read for "naa.####": I/O error
Partition: 1123: Failed to read protective mbr on "naa.####" : I/O error
WARNING: Partition: 1289: Partition table read from device naa.#### failed: I/O error

Device D:0x2 = Check Condition
Plugin P:0x2 = SNAPSHOT

For more information on SCSI sense codes see Understanding SCSI plug-in NMP errors/conditions in ESX/ESXi 7.0

 

 

Resolution

Engage Storage Vendor to activate this snapshot LUN.