On 09/08/2011 02:05 PM, John Doe wrote: > # hdparm -t /dev/sda > Timing buffered disk reads: 636 MB in 3.01 seconds = 211.58 MB/sec > # hdparm -T /dev/sda > Timing cached reads: 18016 MB in 2.00 seconds = 9023.48 MB/sec I'm not a big fan of using hdparm for real benchmarking or comparing things but for the sake of completeness. /dev/sde: Timing cached reads: 24004 MB in 2.00 seconds = 12025.18 MB/sec Timing buffered disk reads: 982 MB in 3.00 seconds = 326.98 MB/sec This is on a dual: Intel(R) Xeon(R) CPU E5645 @ 2.40GHz with 05:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 02) - KB