Re: RAID 10 far and offset on-disk layouts

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[ ... ]
> The "on different drives" part let me wonder _how_ are chunks
> distributed. [ ... ] Question 1: as the two schema have
> different reliability characteristics, which is really used?

It does not matter (except to people writing MD-specific tools).
There is nothing special as to the ordering of drives or chunks
on drives. Also reliability is a *statistical* property not a
geometric one...

> [ ... ] However, this is susceptible to any consecutive
> two-disk failures. A schema like [... ] would not suffer from
> this problem (eg: disk 2 & 3 can fail and the array is still
> working).

That "consecutive two-disk failures" is really funny!

If two-paired-disk failure in RAID10 bother you, try RAID14:

  http://www.sabi.co.uk/blog/13-two.html#131213

Warning: that does not come at no cost :-).
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