Hi Sage, I have experienced an error when I tries to use vstart to create a cluster running on raw device. Here is my vstart command: sudo MON=1 OSD=1 MDS=0 ../src/vstart.sh -b -d -n -x -l -o 'bluestore block path = /dev/sda' -o 'bluestore fsck on mkfs = false' -o 'bluestore fsck on mount = false' -o 'bluestore fsck on umount = false' -o 'bluestore block db path = ' -o 'bluestore block wal path = ' -o 'bluestore block wal create = false' -o 'bluestore block db create = false' -o 'bluefs preextend wal files = true' And here is my error list: /users/ceph/build/bin/ceph-osd -i 0 -c /users/yzhan298/ceph/build/ceph.conf 7f34590d1d80 -1 Falling back to public interface 7f34590d1d80 -1 bdev(0x562ce4c72000 /users/yzhan298/ceph/build/dev/osd0/block) _lock flock failed on /users/yzhan298/ceph/build/dev/osd0/block 7f34590d1d80 -1 bdev(0x562ce4c72000 /users/yzhan298/ceph/build/dev/osd0/block) open failed to lock /users/yzhan298/ceph/build/dev/osd0/block: (11) Resource temporarily unavailable 7f34590d1d80 -1 osd.0 0 OSD:init: unable to mount object store 7f34590d1d80 -1 ** ERROR: osd init failed: (11) Resource temporarily unavailable I couldn’t find the reason for this error. Please help. Thanks, Yiming