Hello Dave, you can configure Ceph to pick multiple OSDs per Host and therefore work like a classic raid. It will cause a downtime whenever you have to do maintenance on a system, but when you plan to grow it quite fast, it's maybe an option for you. -- Martin Verges Managing director Hint: Secure one of the last slots in the upcoming 4-day Ceph Intensive Training at https://croit.io/training/4-days-ceph-in-depth-training. Mobile: +49 174 9335695 E-Mail: martin.verges@xxxxxxxx Chat: https://t.me/MartinVerges croit GmbH, Freseniusstr. 31h, 81247 Munich CEO: Martin Verges - VAT-ID: DE310638492 Com. register: Amtsgericht Munich HRB 231263 Web: https://croit.io YouTube: https://goo.gl/PGE1Bx Am So., 2. Feb. 2020 um 05:11 Uhr schrieb Dave Hall <kdhall@xxxxxxxxxxxxxx>: > Hello. > > Thanks to advice from bauen1 I now have OSDs on Debian/Nautilus and have > been able to move on to MDS and CephFS. Also, looking around in the > Dashboard I noticed the options for Crush Failure Domain and further > that it's possible to select 'OSD'. > > As I mentioned earlier our cluster is fairly small at this point (3 > hosts, 24 OSDs) , but we want to get as much usable storage as possible > until we can get more nodes. SInce the nodes are brand new we are > probably more concerned about disk failures than about node failures for > the next few months. > > If I interpret Crush Failure Domain = OSD, this means it's possible to > create pools that behave somewhat similar to RAID 6 - something like 8 + > 2 except dispersed across multiple nodes. With the pool spread around > like this loosing any one disk shouldn't put the cluster into read-only > mode - if a disk did fail, would the cluster re-balance and reconstruct > the lost data until the failed OSD was replaced. > > Does this make sense? Or is it just wishful thinking. > > Thanks. > > -Dave > > -- > Dave Hall > Binghamton University > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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