On Tue, Mar 11, 2008 at 8:40 AM, Doron Shoham <dorons@xxxxxxxxxxxx> wrote: > sgp_dd if=/dev/sg1 of=/dev/null bs=512 bpt=128 thr=8 time=1 count=5M dio=1 > time to transfer data was 2.236290 secs, 1200.36 MB/sec > 5242880+0 records in > 5242880+0 records out > Direct IO requested but incomplete 40960 times > > What does it mean "Direct IO requested but incomplete 40960 times"? > And what could be the reason for this? The man page of sgp_dd states that the parameter specified to bs must be the block size of the physical device. You can query the block size of a SCSI device with e.g. the scsi_readcap command: $ scsi_readcap /dev/sda sg_readcap /dev/sda Read Capacity results: Last logical block address=625142447 (0x2542eaaf), Number of blocks=625142448 Logical block length=512 bytes Hence: Device size: 320072933376 bytes, 305245.3 MiB, 320.07 GB Bart. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
