With the sas expander you are putting more drives on 'one port'. Just make sure you do not create a bottle neck there, adding to many drives. I guess this depends on the speed of the drives. Then you should be fine not? -----Original Message----- From: Stolte, Felix [mailto:f.stolte@xxxxxxxxxxxxx] Sent: dinsdag 16 juli 2019 17:42 To: ceph-users Subject: New best practices for osds??? 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. Regards Felix ------------------------------------------------------------------------ ------------- ------------------------------------------------------------------------ ------------- Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------ ------------- ------------------------------------------------------------------------ ------------- _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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