Bart Van Assche wrote: > 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. Hi, sg_readcap /dev/sdb Read Capacity results: Last block address=3221225471 (0xbfffffff), Number of blocks=3221225472 Block size=512 bytes Hence: Device size: 1649267441664 bytes, 1572864.0 MiB, 1649.27 GB The block size is 512 as I used in the sgp_dd command. The problem is just when using dio=1, without it it works ok. Thanks, Doron -- 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
