On Fri, Nov 23, 2012 at 05:12:35AM +0100, Karol Babioch wrote: > Hi, > > I'm currently reencrypting my (hardware) RAID setup, which is quite big > (12 TB) in order to change the cipher from aes-xts-plain to aes-xts-plain64. > > While playing around with various options, I found out that a block size > of 64 MB and the use of direct I/O results in the highest speed for me. This seems to be RAID options (i.e. out-of-scope for cryptsetup), and very specific ones as you have some hardware RAID solution. Also 64MB block size is very, very large and will be a problem for some workloads. Also, your sped gain of 10% is negligible, as it is likely not robust and very much dependent on the workload. [...] > Maybe I'm just generalizing too much here when trying > to come up with some conclusions based on my hardware. I think you do. I also think that HW raid is a bit exotic on Linux these days, as SW RAID gives better features and often better performance. 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 ---- One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision. -- Bertrand Russell _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
