Re: Using two roots for the same pool

[Gregory Farnum <gfarnum@xxxxxxxxxx>]

I'm not looking at the docs, but I think you need an "emit" statement after every choose.

-Greg

On Monday, July 11, 2016, George Shuklin <george.shuklin@xxxxxxxxx> wrote:

Hello.

I want to try CRUSH rule with following idea:
take one OSD from root with SSD drives (and use it as primary).
take two OSD from root with HDD drives.

I've created this rule:

rule rule_mix {
        ruleset 2
        type replicated
        min_size 2
        max_size 10
        step take ssd
        step chooseleaf firstn 1 type osd
        step take hdd
        step chooseleaf firstn -1 type osd
        step emit
}

But I think I done something wrong - all PG are undersized+degraded (I use 'size 3', have 2 SSD OSD and 5 HDD OSD).

My noobie questions:

1) Can I use multiple 'take' steps in the single rule?
2) How many emit I should/may use per rule?
3) Is this a proper way to describe such logic? Or it should be done differently? (How?)

Thanks.
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