Ceph » CephFS

vi/vim will create a new file anytime you save. From strace:

stat("foo~", 0x7ffe8283b8a0)            = -1 ENOENT (No such file or directory)
stat("foo", {st_dev=makedev(0, 80), st_ino=1099511627784, st_mode=S_IFREG|0640, st_nlink=1, st_uid=1163, st_gid=1163, st_blksize=4194304, st_blocks=0, st_size=0, st_atime=2018/07/23-12:58:13.225430222, st_mtime=2018/07/23-12:58:13.225430222, st_ctime=2018/07/23-12:58:13.228900554}) = 0
stat("foo~", 0x7ffe8283a870)            = -1 ENOENT (No such file or directory)
unlink("foo~")                          = -1 ENOENT (No such file or directory)
rename("foo", "foo~")                   = 0
open("foo", O_WRONLY|O_CREAT|O_TRUNC, 0640) = 3
write(3, "fhi\n", 4)                    = 4
fsync(3)                                = 0
stat("foo", {st_dev=makedev(0, 80), st_ino=1099511627790, st_mode=S_IFREG|0640, st_nlink=1, st_uid=1163, st_gid=1163, st_blksize=4194304, st_blocks=1, st_size=4, st_atime=2018/07/23-12:58:24.952586078, st_mtime=2018/07/23-12:58:24.956797225, st_ctime=2018/07/23-12:58:24.956797225}) = 0
stat("foo", {st_dev=makedev(0, 80), st_ino=1099511627790, st_mode=S_IFREG|0640, st_nlink=1, st_uid=1163, st_gid=1163, st_blksize=4194304, st_blocks=1, st_size=4, st_atime=2018/07/23-12:58:24.952586078, st_mtime=2018/07/23-12:58:24.956797225, st_ctime=2018/07/23-12:58:24.956797225}) = 0
close(3)                                = 0
chmod("foo", 0100640)                   = 0
write(1, " 1L, 4C written", 15)         = 15

CephFS can't fix this for you.

A workaround would be that you could set a layout on the containing directory instead which would be inherited by new files.