Um rápido Google para "HDIO_GET_IDENTITY falhou por" revelou isso;
Para resumir,
Drive errors in the system log files
/dev/sda: HDIO_GET_IDENTITY failed: Invalid argument
This error is produced by hdparm when using the -i switch on some SCSI and SATA disk drives. hdparm was not designed to be used with SCSI or SATA drives. No tweaks that hdparm can provide are needed for SCSI or SATA drives.
Fix: Disable any Cpanel IDE hard drive tweaks and remove any hdparm settings in local startup files.
Parece que não é importante e provavelmente pode ser ignorado.