On 6/16/2011 8:19 AM, John Stoffel wrote:
>
> Ryan> I've done a hot _add_ to a loop without downtime. A shelf
> Ryan> _swap_ is not as easy and unless you were REALLY fast on your
> Ryan> fingers would require downtime. -rd
>
> I've been hearing on the toasters mailing list that doing stuff like
> this might work for a bit, but that you'll end up with memory leaks
> and a crash sometime down the line.
>
> So push comes to shove, Netapp does NOT offer an easy way to
> expand/grow/migrate your data transparently from one set of
> disks/shelves to another.
>
>
I'll point out that while NetApp makes this difficult, zfs currently
makes this nearly impossible, as a point of comparison. You can use zfs
send/recv to replicate an entire pool, slowly, and in stages, to a
remote host and then schedule a downtime window for the last
synchronization. It's tedious but works ok up to a few 10s of TB, after
that it's impractical. Another way to do it might be to have a total
storage virtualization layer.
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