Tomasz Rola <rto...@ceti.pl> wrote: > Ok. But what is a theoretic speed limit for this device? > > If I do something like this on my laptop w/ssd: > > # date +'%s'; dd if=/dev/sda2 of=/dev/null bs=1024 count=$((512*1024)); > date +'%s' > 1660089697 > 521565184 bytes (522 MB, 497 MiB) copied, 2 s, 261 MB/s > 524288+0 records in > 524288+0 records out > 536870912 bytes (537 MB, 512 MiB) copied, 2,06702 s, 260 MB/s > 1660089699 > > I tried it with reading first 512 megs, for you, since you want to > deal with terabytes, count= would need to be adjusted, say, 100 gigs? > > Reasoning: the specification for sata says one thing, but it says > theoretical upper speed, if I am correct. So you want to know about > real speed limit of _this_ device.
Bravo, you tested the speed at 1024 bytes of data per system call.
