On Mon, 20 Jun 2016 00:14:55 +0700 Lazuardi Nasution wrote: > Hi, > > Is it possible to do cache tiering for some storage pools with the same > cache pool? As mentioned several times on this ML, no. There is a strict 1:1 relationship between base and cache pools. You can of course (if your SSDs/NVMes are large and fast enough) put more than one cache pool on them. > What will happen if cache pool is broken or at least doesn't > meet quorum when storage pool is OK? > With a read-only cache pool nothing should happen, as all writes are going to the base pool. In any other mode (write-back, read-forward or read-proxy) your hottest objects are likely to be ONLY on the cache pool and never getting flushed to the base pool. So that means, if your cache pool fails, your cluster is essentially dead or at the very least has suffered massive data loss. Something to very much think about when doing cache tiering. Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Rakuten Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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