ONTAP Discussions

Span aggregates across stacks

nsitps1976
4,470 Views

Can disks / shelf’s which reside within separate stacks be within the same aggregate?

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BEN_HOLKO
4,470 Views

Yes. My understanding is that the requirement for separate stacks is related to the number of devices on the SAS interface, nothing to do with aggregates. Aggregates are really just a sort of volume group, so as long as the system can see the spindles then it does not matter. I'm sure there's probably some best practice documented somewhere, but the basic answer to your question is yes, aggregates can be cross-stack.

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BEN_HOLKO
4,471 Views

Yes. My understanding is that the requirement for separate stacks is related to the number of devices on the SAS interface, nothing to do with aggregates. Aggregates are really just a sort of volume group, so as long as the system can see the spindles then it does not matter. I'm sure there's probably some best practice documented somewhere, but the basic answer to your question is yes, aggregates can be cross-stack.

nsitps1976
4,470 Views

thanks for this.

with metro cluster are the aggrs mirrored between shelfs within separate stacks, do you know?

aborzenkov
4,470 Views

This is up to you (or whoever configured metrocluster). They should be configured to use different stacks but as far as I know, nothing in Data ONTAP actually enforces it.

For FMC you normally mirror between sites and shelves in each site are of course in separate stacks.

nsitps1976
4,471 Views

great, thanks

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