On 17/7/19 1:12 am, Stolte, Felix wrote: > Hi guys, > > our ceph cluster is performing way less than it could, based on the disks we are using. We could narrow it down to the storage controller (LSI SAS3008 HBA) in combination with an SAS expander. Yesterday we had a meeting with our hardware reseller and sale representatives of the hardware manufacturer to resolve the issue. > > They told us, that "best practices" for ceph would be to deploy disks as Raid 0 consisting of one disk using a raid controller with a big writeback cache. > > Since this "best practice" is new to me, I would like to hear your opinion on this topic. It been my understanding that from day one the best practice for CEPH was one disk in JBOD (no raid of any kind) and as close to 1 to 1 on the interface to the controller as possible. With spinning rust you can use a SAS expander, a single drive can not saturate the link but SSD has to be 1 to 1. Mike _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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