hi Bryn: 2014-07-08 0:25 GMT+08:00 Bryn M. Reeves <bmr@xxxxxxxxxx>: > On Tue, Jul 08, 2014 at 12:15:54AM +0800, loody wrote: >> so sg_read will not hammer on the page cache like dd without "iflags=direct" >> >> thanks for your kind help, > > The sg_read program (and other programs in sg3_utils) sends a command directly > to the device using an SG_IO ioctl. This bypasses all the caching layers in > the kernel and always results in IO to the device (if it succeeds). > I download sg utility but I found if I need to use sg_read only, I need to install sg_lig on my target system. is there any simple source I can reference for just doing the scsi read through IOCTL as you explained to us before? appreciate your kind help, -- Regards, -- 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
