### Please describe the problem.

decided to test annex on a new to me file system -- beegfs

```
$> mount | grep beegfs
beegfs_nodev on /mnt/beegfs type beegfs (rw,relatime,cfgFile=/etc/beegfs/beegfs-client.conf,_netdev)

```

```
$> modinfo beegfs
filename:       /lib/modules/5.4.0-77-generic/updates/fs/beegfs_autobuild/beegfs.ko
version:        7.2.2
alias:          fs-beegfs
author:         Fraunhofer ITWM, CC-HPC
description:    BeeGFS parallel file system client (http://www.beegfs.com)
license:        GPL v2
srcversion:     533BB7E5866E52F63B9ACCB
depends:        ib_core,rdma_cm
retpoline:      Y
name:           beegfs
vermagic:       5.4.0-77-generic SMP mod_unload modversions

```

### What steps will reproduce the problem?

1. get beegfs

2.
```
leviathan:/mnt/beegfs/yoh/tmp
$> TMPDIR=$PWD/annex-tmp git annex test
```


### What version of git-annex are you using? On what operating system?

```
leviathan:/mnt/beegfs/yoh/tmp
$> git annex version
git-annex version: 8.20210621-g91f9aac
build flags: Assistant Webapp Pairing Inotify DBus DesktopNotify TorrentParser MagicMime Feeds Testsuite S3 WebDAV
dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.26 DAV-1.3.4 feed-1.3.0.1 ghc-8.8.4 http-client-0.6.4.1 persistent-sqlite-2.10.6.2 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.1.0
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL X*
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
operating system: linux x86_64
supported repository versions: 8
upgrade supported from repository versions: 0 1 2 3 4 5 6 7
```

### Please provide any additional information below.

looking in detail -- it seems it is not init, but addurl (but subject is set in stone now, can't edit) -- got mislead I guess by the interleaving stdout/err:

[[!format sh """
    addurl:                                               FAIL (2.79s)
Init Tests
  init:       ./Test/Framework.hs:57:
      addurl on file:///mnt/beegfs/yoh/tmp/.t/tmprepo96/myurl failed (transcript follows)
(to _mnt_beegfs_yoh_tmp_.t_tmprepo96_myurl) git-annex: .git/annex/tmp/URL-s3--file&c%%%mnt%beegfs%yoh%tmp%.t%tmprepo96%myurl: renameFile:renamePath:rename: resource busy (Device or resource busy)failedaddurl: 1 failed

...
    addurl:                                               FAIL (1.86s)
      ./Test/Framework.hs:57:
      addurl on file:///mnt/beegfs/yoh/tmp/.t/tmprepo193/myurl failed (transcript follows)
(to _mnt_beegfs_yoh_tmp_.t_tmprepo193_myurl) git-annex: .git/annex/tmp/URL-s3--file&c%%%mnt%beegfs%yoh%tmp%.t%tmprepo193%myurl: renameFile:renamePath:rename: resource busy (Device or resource busy)failedaddurl: 1 failed
Init Tests
...
    addurl:                                               FAIL (2.29s)
      ./Test/Framework.hs:57:
      addurl on file:///mnt/beegfs/yoh/tmp/.t/tmprepo293/myurl failed (transcript follows)
(to _mnt_beegfs_yoh_tmp_.t_tmprepo293_myurl) git-annex: .git/annex/tmp/URL-s3--file&c%%%mnt%beegfs%yoh%tmp%.t%tmprepo293%myurl: renameFile:renamePath:rename: resource busy (Device or resource busy)failedaddurl: 1 failed

3 out of 984 tests failed (1776.96s)

"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

on days ending with `y` it seems to work quite nicely.

[[!meta author=yoh]]
[[!tag projects/dandi]]

> [[fixed|done]], I think, though have not installed beegfs to test.
> --[[Joey]]
