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Bug #11840

Updated by Kefu Chai almost 5 years ago


>
there are three pool in ceph cluster, e.g, t1, t2 t3, and t2 is a cache of t1.
> 1, we can set t1 as a cache of t2 too, then t1 is the cache of t2, t2 also is the cache of t1,a loop of cache generated;
> 2, we can also set t3 as a cache of t2 ort t1, then a three level cache tier generated, t3 is the cache of t2, t2 is the cache of t1.
> cache loop, and three level cache are weird, also maybe reduce the IO performance, so it'd be better to avoid complicated tier like them.
>

we don't support multiple tiering, so we'd better fail a "ceph osd tier add" command which intent to add a tier for another tier.

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