Its a VM(SLES 12 SP2) running on ESX 6.5. ESX is not showing any error, while at OS we are getting following errors:

kernel: [787030.198763] end_request: I/O error, dev sda, sector 3759139416
kernel: [1530802.448197] end_request: I/O error, dev sda, sector 3754016448
kernel: [1912330.306074] end_request: I/O error, dev sda, sector 3719306720
kernel: [1954566.577314] end_request: I/O error, dev sda, sector 3722956392

The disk(sda) is a virtual disk.

Please help, what and where should I check ?