Hi,
I concur with Paul. Any kind of RAID for OSD devices would be ill advised.
Make sure the 3008 SAS controller is flashed with the IT firmware so it will operate in JBOD mode.
Regards, Kaspar
Op 16 juli 2019 om 17:56 schreef Paul Emmerich <paul.emmerich@xxxxxxxx>:
_______________________________________________On Tue, Jul 16, 2019 at 5:43 PM Stolte, Felix < f.stolte@xxxxxxxxxxxxx> wrote:
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.We've got a few clusters running like that, usually because raid controllers not supporting anything else.Sometimes the raid controller caches help with performance in specific use cases, but they can also hurt performance by doing stupid things.But best practice would be to just use them in jbod mode or pass-through mode.Paul
Regards Felix
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