On 03/17/2011 03:29 PM, Lars Täuber wrote: > does dm-crypt depend in any way on the sector size of the block > device to be encrypted? So the real question is: Does dm-crypt work > as expected on a 4KiB sector sized SATA drive when there is no > translation to 512B sector size? Are there options that must be taken > then? > > I've read somewhere that the encryption algorithm work with 512B > block sizes. Could this be changed to 4KiB block sizes to gain speed > with the upcoming devices? dmcrypt always uses 512 bytes sector for encryption, it cannot be changed easily to 4k sectors (internal block layer bio structure and device-mapper always counts in 512 sectors). I do not think that with accelerated encryption like AES-NI the speed up would be so visible. But the whole stack (including device-mapper) properly aligns to drive sector size, so it will work with 4k drives without problems. I think many people is already using it on true 4k drives. In fact mapping sector is the block layer problem, device-mapper targets just propagates block size information up the stack. Milan _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
