>> Reverting back to filestore is quite a lot of work and time again. >> Maybe see first if with some tuning of the vms you can get better results? > >None of the VMs are particularly disk-intensive. There's two users accessing the system over a WiFi network for email, and some HTTP/SMTP traffic coming in via an ADSL2 Internet connection. > >If Bluestore can't manage this, then I'd consider it totally worthless in any enterprise installation -- so clearly something is wrong.
I have a cluster mainly intended for backups to cephfs, 4 nodes, sata disks and mostly 5400rpm. Because the cluster is doing nothing. I decided to put vm's on them. I am running 15 vm's without problems on the hdd pool. Going to move more to them. One of them is an macos machine, I did once a fio test in it and gave me 917 iops at 4k random reads. (technically not possible I would say, I have mostly default configurations in libvirt) > >> What you also can try is for io intensive vm's add an ssd pool? > >How well does that work in a cluster with 0 SSD-based OSDs? > >For 3 of the nodes, the cases I'm using for the servers can fit two 2.5" >drives. I have one 120GB SSD for the OS, that leaves one space spare for the OSD. I think this could be your bottle neck, I have 31 drives, so the load is spread across 31 (hopefully). If you have only 3 drives you have 3x60iops to share amongst your vms. I am getting the impression that ceph development is not really interested in setups quite different from the advised standards. I once made an attempt to get things better working for 1Gb adapters[0]. > >I since added two new nodes, which are Intel NUCs with m.2 SATA SSDs for the OS and like the other nodes have a single 2.5" drive bay. > >This is being done as a hobby and a learning exercise I might add -- so while I have spent a lot of money on this, the funds I have to throw at this are not infinite. Same here ;) > >> I moved >> some exchange servers on them. Tuned down the logging, because that is >> writing constantly to disk. >> With such setup you are at least secured for the future. > >The VMs I have are mostly Linux (Gentoo, some Debian/Ubuntu), with a few OpenBSD VMs for things like routers between virtual networks. > [0] https://www.mail-archive.com/ceph-users@lists.ceph.com/msg35474.html _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
