Heterogenous, dynamic RAID for a home server

[Amos Shapira]

The Wikipedia article about drobo explains a bit about their disk layout.
Also what about using raid 6 instead of 5? I think I read claims that it's
not only more resilient nut could also be faster.
On Feb 23, 2012 12:44 AM, "Ira Abramov" <Lists-Linux-IL at ira.abramov.org>
wrote:

> Hey people,
>
> A friend of mine want to build a file server machine at home to get the
> benefits of a Drobo, but for 1500 NIS rather than $1500.
>
> The idea is to mix in 1T, 2T and 3T disks he already has, and on
> occasion grow the ׁ•torage by another disk or replace and rebalance it.
> He wants it to be more reliable than RAID0 but more efficient than
> RAID10, so RAID 5/6 are more like it.
>
> I looked around at the idea of ZFS or a distributed FS on a single node,
> but they are not options. I'm thinking how to do it with a block
> redundancy scheme, and so far I came up with this: create a RAID5 from
> the lower 1TB of all the disks you have, then a smaller RAID5 array from
> the second TB, and finally a RAID1 or RAID5 from whatever you have left.
>
> so if we say I have 2*3T and 2*2T and 1*1T, I have (5-1)*1T+(4-1)*1T+1T
> (the last is RAID1). now I have 8TB in three block devices, and I make a
> single LV (LVM2) from three extents.
>
> Is there a better solution? do note that it's not optimal for spindle
> activity, but this is a home machine serving two other computers and a TV
> streamer at the worst case.
>
> Any feedback is welcome...
>
> --
> Perishable item
> Ira Abramov
> http://ira.abramov.org/email/
>
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