Cache upload error - when I don't think it should be uploading?

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1

What is the problem you are having with rclone?

I’m getting a weird error “failed to write to cache”. As far as I know, my setup (2x WebDav mounts) shouldn’t be trying to write cache files to the remote. the only local files that are being created I think is by Emby that creates .nfo files - is rclone trying to write these to the remote? If so, is there a way to stop rclone trying to do this and to only cache remote files locally?

Thanks

Run the command 'rclone version' and share the full output of the command.

rclone v1.72.1

  • os/version: slackware 15.0+ (64 bit)
  • os/kernel: 6.12.54-Unraid (x86_64)
  • os/type: linux
  • os/arch: amd64
  • go/version: go1.25.5
  • go/linking: static
  • go/tags: none

Which cloud storage system are you using? (eg Google Drive)

The command you were trying to run (eg rclone copy /tmp remote:tmp)

```rclone mount --allow-other --umask 000 --uid 99 --gid 100 --log-level NOTICE --dir-cache-time 10s --buffer-size 16M --vfs-cache-mode full --vfs-cache-max-size=200G --cache-dir=/mnt/user/streaming/cache/rd-mount --vfs-read-ahead 32M --vfs-read-chunk-size 1M --vfs-read-chunk-size-limit 64M zurg: /mnt/user/streaming/rd-mount &

```rclone mount --uid=99 --gid=100 --allow-other --links --use-cookies --vfs-cache-mode=full --vfs-cache-max-size=200G --cache-dir=/mnt/user/streaming/cache/nzbdav --vfs-cache-max-age=24h --buffer-size=0M --vfs-read-ahead 512M --dir-cache-time=20s nzb-dav: /mnt/user/streaming/nzbdav &

Please run 'rclone config redacted' and share the full output. If you get command not found, please make sure to update rclone.

```
[debrid]
type = webdav
url = https://dav.real-debrid.com/
vendor = other
user = XXX
pass = XXX
[decypharr]
type = webdav
url = http://192.168.1.1:8282/webdav/realdebrid
vendor = other
pacer_min_sleep = 0s
[nzb-dav]
type = webdav
url = http://192.168.1.1:3000
vendor = other
user = XXX
pass = XXX
[zurg]
type = webdav
url = http://localhost:9999/dav/
vendor = other
pacer_min_sleep = 0s
[zurghttp]
type = http
url = http://localhost:9999/http
no_head = false
no_slash = false

A log from the command that you were trying to run with the -vv flag

2026/01/12 10:45:50 ERROR : .ids/5/1/7/4/e/5174ed29-8125-4506-b7bc-58e22157715d: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:45:50 ERROR : .ids/5/1/7/4/e/5174ed29-8125-4506-b7bc-58e22157715d: vfs cache: failed to upload try #2, will retry in 20s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:08 ERROR : .ids/2/c/f/c/4/2cfc4e73-9465-49c2-9653-e08796452577: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:08 ERROR : .ids/2/c/f/c/4/2cfc4e73-9465-49c2-9653-e08796452577: vfs cache: failed to upload try #1, will retry in 10s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:09 ERROR : .ids/a/1/b/c/4/a1bc4dd1-d0df-41df-bd8c-2fedbe4a9184: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:09 ERROR : .ids/a/1/b/c/4/a1bc4dd1-d0df-41df-bd8c-2fedbe4a9184: vfs cache: failed to upload try #3, will retry in 40s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:14 ERROR : .ids/5/1/7/4/e/5174ed29-8125-4506-b7bc-58e22157715d: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:14 ERROR : .ids/5/1/7/4/e/5174ed29-8125-4506-b7bc-58e22157715d: vfs cache: failed to upload try #3, will retry in 40s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:19 ERROR : .ids/d/0/c/2/e/d0c2ee6e-529c-43b1-a8c1-057300b56caa: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:19 ERROR : .ids/d/0/c/2/e/d0c2ee6e-529c-43b1-a8c1-057300b56caa: vfs cache: failed to upload try #1, will retry in 10s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:20 ERROR : .ids/2/c/f/c/4/2cfc4e73-9465-49c2-9653-e08796452577: Failed to copy: unchunked simple update failed: 403 Forbidden
2026/01/12 10:46:20 ERROR : .ids/2/c/f/c/4/2cfc4e73-9465-49c2-9653-e08796452577: vfs cache: failed to upload try #2, will retry in 20s: vfs cache: failed to transfer file from cache to remote: unchunked simple update failed: 403 Forbidden
2

that is usually a permissions issue.

rclone on its own, does not modify the files inside the mountpoint or the cache.

some application, i guess emby is copying/editing/modiying/deleting file(s) in the mountpoint.
if a file is copied/opened inside mountpoint, rclone will copy it to cache and then be upload it.

might try --read-only but not sure it will help when/if applications are writing to the montpoint.

3

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