On Fri, Feb 03, 2017 at 10:10:19PM +0800, Tinker wrote: > I knew that swap crypto is enabled by default. > > I thought that, if you put your swap disk on a crypto softraid, then, you > get a *sandwhiched* double crypto - both the swap crypto *and* the softraid > crypto, so double work? > > Isn't that the case, so that it would be wasteful to have the swap on the > crypto sofraid for that reason?
Yeah it is probably less efficient. But is this worth the extra complexity of having swap and dump on a different disk than root? I don't think so. You're probably wasting more time just thinking about this rather than letting the computer flip a few extra bits when the system swaps (if ever). Swap and dump device conventions are very old. There are even compile-time kernel config options to change them which tells us someting about their age. Again, I would not bother compiling a custom kernel just for this.
