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@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
