Thank you for the reply, Florian. Yes, MON data is on the RAID drive. Is it recommended to get its own drive? What do MON writes look like in terms of size/frequency? So slow IO's and monitor elections are a symptom of not enough disk performance? Even though the disks don't appear to be maxed out? Is there a clear way to tell given some fio or rados bench test? We don't have SSD's available at the moment, so is it at all logical to co-locate a few journals on the same spinners? If we keep Ceph on this system, I think we will eventually be putting SSD's in, but as of right now our issues are more stability based rather than performance-based. Bill ________________________________________ From: Smart Weblications GmbH - Florian Wiessner [f.wiessner@xxxxxxxxxxxxxxxxxxxxx] Sent: Wednesday, December 10, 2014 2:30 PM To: Sanders, Bill; ceph-users@xxxxxxxxxxxxxx Subject: Re: Monitors repeatedly calling for new elections Hi, Am 08.12.2014 20:23, schrieb Sanders, Bill: > I've just stood up a Ceph cluster for some experimentation. Unfortunately, > we're having some performance and stability problems I'm trying to pin down. > More unfortunately, I'm new to Ceph, so I'm not sure where to start looking for > the problem. > > > We've configured 4 nodes for storage and have connected 2 identical nodes to > this cluster to access the cluster storage over the kernel RBD driver. MON's > are configured on the first three storage nodes. > Where is the mon data dir located? On the root RAID system? Maybe that is not fast enough for many small writes. You could try to move the mon data dir to ssd. -- Mit freundlichen Grüßen, Florian Wiessner Smart Weblications GmbH Martinsberger Str. 1 D-95119 Naila fon.: +49 9282 9638 200 fax.: +49 9282 9638 205 24/7: +49 900 144 000 00 - 0,99 EUR/Min* http://www.smart-weblications.de -- Sitz der Gesellschaft: Naila Geschäftsführer: Florian Wiessner HRB-Nr.: HRB 3840 Amtsgericht Hof *aus dem dt. Festnetz, ggf. abweichende Preise aus dem Mobilfunknetz _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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