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I have a fresh install of 4.0. Everything has been updated. I have multiple drives in a pool with unionfilesystem that is then shared over smb. I use an app on my phone Sweet Home! to nightly backup my pictures to the SMB share. The app seems to copy the files to the root of the share and then move them to the appropriate folder based on the date. It looks like when it goes to move the files it sometimes fails. I tested going to a standard SMB share not on my drive pool and the process works correctly. It previously worked on OMV 2.x. Attached are the error logs from SMB. I'm not sure if there are logs to gather from mergerfs or if there are any settings to adjust there that I'm missing?
Code
[2018/03/23 17:32:21.473992, 2] ../source3/smbd/trans2.c:6271(smb_set_file_dosmode)
smb_set_file_dosmode: file_set_dosmode of Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp failed (Operation not permitted)
[2018/03/23 17:32:21.474041, 3] ../source3/smbd/error.c:82(error_packet_set)
NT error packet at ../source3/smbd/trans2.c(8878) cmd=50 (SMBtrans2) NT_STATUS_ACCESS_DENIED
[2018/03/23 17:32:21.476318, 3] ../source3/smbd/process.c:1958(process_smb)
Transaction 2960 of length 244 (0 toread)
[2018/03/23 17:32:21.476357, 3] ../source3/smbd/process.c:1538(switch_message)
switch message SMBmv (pid 10935) conn 0x561d119d4ec0
[2018/03/23 17:32:21.478989, 3] ../source3/smbd/reply.c:7442(reply_mv)
reply_mv : Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp -> Huffman-Pictures/Eyefi/2018/03/20180319_211928.jpg
[2018/03/23 17:32:21.479028, 3] ../source3/smbd/reply.c:7068(rename_internals)
rename_internals: case_sensitive = 0, case_preserve = 1, short case preserve = 1, directory = Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp, newname = Huffman-Pictures/Eyefi/2018/03/20180319_211928.jpg, last_component_dest = 20180319_211928.jpg
[2018/03/23 17:32:21.479513, 2] ../source3/smbd/open.c:1342(open_file)
scotth opened file Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp read=No write=No (numopen=2)
[2018/03/23 17:32:21.480428, 3] ../source3/smbd/reply.c:6962(rename_internals_fsp)
rename_internals_fsp: Error NT_STATUS_NOT_SAME_DEVICE rename Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp -> Huffman-Pictures/Eyefi/2018/03/20180319_211928.jpg
[2018/03/23 17:32:21.480521, 2] ../source3/smbd/close.c:788(close_normal_file)
scotth closed file Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp (numopen=1) NT_STATUS_OK
[2018/03/23 17:32:21.480577, 3] ../source3/smbd/reply.c:7138(rename_internals)
rename_internals: Error NT_STATUS_NOT_SAME_DEVICE rename Huffman-Pictures/Eyefi/20180319_211928.jpg.tmp -> Huffman-Pictures/Eyefi/2018/03/20180319_211928.jpg
[2018/03/23 17:32:21.480603, 3] ../source3/smbd/error.c:82(error_packet_set)
NT error packet at ../source3/smbd/reply.c(7452) cmd=7 (SMBmv) NT_STATUS_NOT_SAME_DEVICE