I have one spare machine with a single 1TB on it, and I'd like to test a local Ceph install. This is just for testing, I don't care that it won't have redundancy, failover, etc. Is there any canonical documentation for this case? - - - Longer story is this morning I found this documentation through many Google searches: https://medium.com/@balderscape/setting-up-a-virtual-single-node-ceph-stora… It kind of works up to a point. I was able to get Ceph installed, get both the command line and web interfaces up and running, and got as far as: # ceph status cluster: id: 723e09aa-dbd3-11ea-8587-94c691189836 health: HEALTH_WARN Reduced data availability: 1 pg inactive OSD count 0 < osd_pool_default_size 3 services: mon: 1 daemons, quorum dev1 (age 77m) mgr: dev1.ziibhq(active, since 76m) osd: 0 osds: 0 up, 0 in data: pools: 1 pools, 1 pgs objects: 0 objects, 0 B usage: 0 B used, 0 B / 0 B avail pgs: 100.000% pgs unknown 1 unknown # ceph orch device ls HOST PATH TYPE SIZE DEVICE AVAIL REJECT REASONS dev1 /dev/sdb hdd 14.9G Cruzer_Blade_4C530210050318117591 True dev1 /dev/sda hdd 931G WDC_WD10JFCX-68N_WD-WXD1AB73AUX5 False LVM detected, locked (The USB stick is left over from the install and isn't suitable as an OSD). However I've been completely unable to add any OSDs using the local disk. The disk (/dev/sda3) is a PV and there is plenty of space. I even created some devices that I was hoping to use as OSDs: # lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert osd1 rhel_dev1 -wi-a----- 100.00g osd2 rhel_dev1 -wi-a----- 100.00g osd3 rhel_dev1 -wi-a----- 100.00g root rhel_dev1 -wi-ao---- 50.00g swap rhel_dev1 -wi-ao---- <7.84g but it simply doesn't do anything when I try to add them: # ceph orch daemon add osd localhost:rhel_dev1/osd1 (no error, exit code 0) So I guess the fact that the device is marked as "AVAIL = False" and "locked" is bad somehow. Can I add the OSDs anyway? Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html