Re: [PATCH] Add mdadm to the installation image.

[Andreas Enge]

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