On Thu, Jul 14, 2016 at 10:21:25PM +0300, Efraim Flashner wrote: > How much does it add to the size?
$ guix size mdadm store item total self /gnu/store/k2hlwyzfs1v5xj1v6475n52jljd9q89x-mdadm-3.4 79.7 1.1 1.4% /gnu/store/lpvkjic9dhj55plc29jhq8l39irvqm4f-coreutils-8.25 78.6 14.3 17.9% /gnu/store/g6704rf6gk8w1czvj24d5sbh9zvhf50i-gmp-6.1.0 63.5 2.6 3.2% /gnu/store/cny25x3kx0z7c93dsnd9vsxasjgln76d-acl-2.2.52 61.6 0.4 0.5% /gnu/store/m92xmqp7skc233s867bg3gab860sikwl-libcap-2.24 61.3 0.1 0.2% /gnu/store/zv5x1g1p4kail830r9aw6n49kw0gk92f-attr-2.4.47 61.2 0.2 0.3% /gnu/store/9nifwk709wajpyfwa0jzaa3p6mf10vxs-gcc-4.9.3-lib 60.9 22.9 28.7% /gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23 38.1 36.7 46.1% /gnu/store/0010wvgs40kdq8chzsh403qm7la9jxq7-bash-static-4.3.42 1.4 1.4 1.7% total: 79.7 MiB But I think that most of these are already there anyway, and only the "self" part of 1.1MB actually comes extra. > also, raid10 with 2 disks? Yes. With the "far" layout, the second disk is a mirror of the first one, but with the blocks in a different order. So the second disk creates a backup, and large sequential reads should become close to twice as fast. Andreas