Does that also mean that scrubbing and deep-scrubbing also squishes data out of the cache pool? Could someone from the ceph community confirm this? Thanks ----- Original Message ----- From: "Robert LeBlanc" <robert@xxxxxxxxxxxxx> To: "Andrei Mikhailovsky" <andrei at arhont.com> Cc: ceph-users at lists.ceph.com Sent: Friday, 22 August, 2014 8:21:08 PM Subject: Re: pool with cache pool and rbd export My understanding is that all reads are copied to the cache pool. This would indicate that cache will be evicted. I don't know to what extent this will affect the hot cache because we have not used a cache pool yet. I'm currently looking into bcache fronting the disks to provide caching there. Robert LeBlanc On Fri, Aug 22, 2014 at 12:41 PM, Andrei Mikhailovsky < andrei at arhont.com > wrote: Hello guys, I am planning to perform regular rbd pool off-site backup with rbd export and export-diff. I've got a small ceph firefly cluster with an active writeback cache pool made of couple of osds. I've got the following question which I hope the ceph community could answer: Will this rbd export or import operations affect the active hot data in the cache pool, thus evicting from the cache pool the real hot data used by the clients. Or does the process of rbd export/import effect only the osds and does not touch the cache pool? Many thanks Andrei _______________________________________________ ceph-users mailing list ceph-users at lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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