I also have 2+1 (still only 3 nodes), and 3 replicated. I also moved the meta datapool to ssds. What is nice with the cephfs, you can have folders in your filesystem on the ec21 pool for not so important data and the rest will be 3x replicated. I think the single session performance is not going to give you same performance as the raid. But you can compensate that by doing your backup in parallel. -----Original Message----- From: Kevin Olbrich [mailto:ko@xxxxxxx] Sent: woensdag 22 augustus 2018 14:28 To: ceph-users Subject: HDD-only CephFS cluster with EC and without SSD/NVMe Hi! I am in the progress of moving a local ("large", 24x1TB) ZFS RAIDZ2 to CephFS. This storage is used for backup images (large sequential reads and writes). To save space and have a RAIDZ2 (RAID6) like setup, I am planning the following profile: ceph osd erasure-code-profile set myprofile \ k=3 \ m=2 \ ruleset-failure-domain=rack Performance is not the first priority, this is why I do not plan to outsource WAL/DB (broken NVMe = broken OSDs is more administrative overhead then single OSDs). Disks are attached by SAS multipath, throughput in general is no problem but I did not test with ceph yet. Is anyone using CephFS + bluestore + ec 3/2 + without WAL/DB-dev and is it working well? Thank you. Kevin _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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