Re: > 2TB ?

No email [off-list ref] wrote:

Forgive me as this is probably a silly question and one that has been
answered many times, I have tried to search for the answers but have
ended up more confused than when I started.  So thought maybe I could
ask the community to put me out of my misery

Is there a version of MD that can create larger than 2TB raid sets?  

Hmm ...  with 1KB blocks, and at 32 bits, 2^32 * 1KB = 4TB would be the
notional limit of any block device counted in blocks and using a 32bit
counter.

But in the 2.6 kernel the counter is 64bit.

Obviously with 400GB drives being commonplace a typical 12 bay solution
is capable of significant capacity,

3.6TB under raid0 or linear?

but if we need to split this down
into multiple raid sets, then we start to lose.  

I don't see that you have to on general principle even on a 2.4 kernel,
but maybe there are extra limits in the case of md devices over block
devices that I do not know about.

So, if anyone can advise me as to MD / Linux size limitations I would be
grateful :)

Well, I don't have anything to add to the observation above and I'm too
lazy to look! But where do you get the "2TB" number from? I can believe
that as a number for 1KB block devices in general in early 2.4 kernel
times, before signage had been dealt with.

Peter