Unity provisioned LUN showing I/O errors in VMware hosts

A LUN was provisioned to VMware hosts from a Unity 300 storage array. One datastore was created from the provisioned LUN. Recently, the datastore became inaccessible. A reboot of the ESXi host , and rescan of the adapters and storage didn't bring it back. So the LUN is still seen under devices, but nothing in datastores. Looking at the ESXi host, there are I/O errors seen.

From vmkernel.log

ScsiDeviceIO: 3483: Cmd(0x459a96fc3ac0) 0x28, CmdSN 0x3ac5 from world 0 to dev "naa.6006016073c04200e0d3975bc7aa848f" failed H:0x0 D:0x2 P:0x2 Invalid sense data: 0x0 0x0 0x0.
2021-02-03T15:37:01.502Z cpu8:2104558)Partition: 430: Failed read for "naa.6006016073c04200e0d3975bc7aa848f": I/O error
2021-02-03T15:37:01.502Z cpu8:2104558)Partition: 1108: Failed to read protective mbr on "naa.6006016073c04200e0d3975bc7aa848f" : I/O error
2021-02-03T15:37:01.502Z cpu8:2104558)WARNING: Partition: 1261: Partition table read from device naa.6006016073c04200e0d3975bc7aa848f failed: I/O error

Tried running a few commands to check on the partition table.

partedUtil getptbl "vmfs/devices/disks/naa.6006016073c04200e0d3975bc7aa848f"
  unknown
  935722 255 63 15032385536

partedUtil getUsableSectors "vmfs/devices/disks/naa.6006016073c04200e0d3975bc7aa848f"
 Unknown partition table on disk vmfs/devices/disks/naa.6006016073c04200e0d3975bc7aa848f

Same error messages are seen on all hosts that have the datastore.

VMware team said the error is coming from storage side. But I can't see any error on the LUN when I check the Unisphere.

What could be causing that?