Thank you very much for the reply and explaination. I suspected that there was not a concern to dm-crypt in regards to 4K sectors since I did not find any mantion of it when searching the web and it's good to have that confirmed. On Sat, Jan 18, 2014 at 7:36 PM, Arno Wagner <arno@xxxxxxxxxxx> wrote: > On Sat, Jan 18, 2014 at 20:24:47 CET, Arno Wagner wrote: >> On Sat, Jan 18, 2014 at 15:14:29 CET, Garðar Arnarsson wrote: >> > Did a quick search but came up empty handed. >> > >> > I'm wondering if there is anything special that needs to be passed to >> > be able to use dm-crypt (cryptsetup) with 4096 byte sector drives. >> > >> > I know md, lvm, partitions, filesystems all need to have special >> > triggers for 4K drives (even thouh I think it's done automatically for >> > all of them nowadays) but I see no mention of dm-crypt/cryptsetup. >> >> Do not worry. Dm-crypt uses 512B sectors, but there is only a >> negligible performance loss. This matters far, far more on the >> filesystem layer. If that layer does it right, dm-crypt will >> allways process 8 x 512B at a time, as it does process exacly >> what the uppeer layer requests. And alignment in LUKS is done >> so that 4k sectors will not be broken up for the data area. >> >> Hence this is not a concern and that is the reason it is >> not mentioned. I think I will add an FAQ entry for this. >> >> Arno > > Just added Item 2.17 to the FAQ. > > Arno > -- > Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx > GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 > ---- > There are two ways of constructing a software design: One way is to make it > so simple that there are obviously no deficiencies, and the other way is to > make it so complicated that there are no obvious deficiencies. The first > method is far more difficult. --Tony Hoare > _______________________________________________ > dm-crypt mailing list > dm-crypt@xxxxxxxx > http://www.saout.de/mailman/listinfo/dm-crypt _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
