[root@FsXENSVR109 ~]# ll /dev/disk/by-id/ | grep <SCSI ID> NOTE: SCSI ID can be found on the 'General' tab of your SR in XenCenter
The output of this command will be something like the following:
lrwxrwxrwx 1 root root 9 Feb 12 19:16 scsi-36000d3100087d3000000000000000005 -> ../../sdb
Once you have this information you can execute the following command
[root@FsXENSVR109 ~]# hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 248 MB in 3.06 seconds = 81.08 MB/sec
[root@FsXENSVR109 ~]# hdparm -t /dev/sdb
