[Gluster-users] Expanding legacy gluster volumes

James purpleidea at gmail.com
Wed Nov 20 08:19:52 UTC 2013


Anyone have any thoughts on this?


On Mon, Nov 11, 2013 at 7:24 PM, James <purpleidea at gmail.com> wrote:
> Hi there,
> This is a hypothetical problem, not one that describes specific hardware
> at the moment.
> As we all know, gluster currently usually works best when each brick is
> the same size, and each host has the same number of bricks. Let's call
> this a "homogeneous" configuration.
> Suppose you buy the hardware to build such a pool. Two years go by, and
> you want to grow the pool. Changes in drive size, hardware, cpu, etc
> will be such that it won't be possible (or sensible) to buy the same
> exact hardware, sized drives, etc... A heterogeneous pool is
> unavoidable.
> Is there a general case solution for this problem? Is something planned
> to deal with this problem? I can only think of a few specific corner
> case solutions.
> Another problem that comes to mind is ensuring that the older slower
> servers don't act as bottlenecks to the whole pool. jdarcy had mentioned
> that gluster might gain some notion of tiering, to support things like
> ssd's in one part of the volume, and slow drives at the other end. Maybe
> this sort of architecture can be used to solve the same problems.
> Thoughts and discussion welcome.
> Cheers,
> James

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