On Fri, Jan 04, 2013 at 06:46:20PM -0600, Stan Hoeppner wrote: > >> 1. What filesystem are you using? > > > > The filesystem is the "application": it's zfsonlinux. I'm putting it on > > RAID10 instead of using the disks natively because I want to encrypt it > > using LUKS, and encrypting each disk separately seemed wasteful of CPU (I > > only have 3 cores). > > I just love when the other shoe drops and it turns out to be a size 13 > boot... filled with lead. > > Any reason why you intentionally omitted these critical details from > your initial post? Yes: I thought I was asking a theoretical question, not for advice on tuning my specific setup, and thought - apparently correctly, I might add :) - that including these details would only get everyone sidetracked into trying to optimise for a specific application. I don't have a specific application with a specific access pattern because I have to run all sorts of applications on this box, on top of this array, simultaneously. But meanwhile I think I have received an answer: the fact that zfs uses blocks of 128k or less does not automatically mean that write performance would suffer on a 512k-chunk RAID10 array because the Linux RAID10 implementation, very sensibly, doesn't insist on writes being aligned to chunk boundaries. So thanks. -- Andras Korn <korn at elan.rulez.org> Reality is merely an illusion, albeit a very persistent one. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html