--- On Thu, 5/6/10, Sage Weil <sage@xxxxxxxxxxxx> wrote:
> The image is striped over objects, _then_ the objects are
> replicated across OSDs. Objects themselves aren't striped.
>
> For example, if an image is striped over objects A B C D E
> F, each 4MB, you might end up with
>
> osd0: A B' C D E' F'
> osd1: A' B C' D' E F
>
> where A is the primary copy, A' is the replica, etc.
Yes, I see now, much clearer, thanks.
So, as long as each object has one copy on each OSD it
should be safe. And there might be some hash based
extra non-perfect stripping as a benefit. Then, yeah,
it does seem like it would be hard to find a very
unbalanced workload on a heterogeneous OSD (even with
a 2 node cluster). Cool.
Thanks,
-Martin
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