"Database or disk is full" - Might Be Syncthing, Might Be Qnap...

Moisie · August 27, 2025, 4:37pm

I don’t know if this is a Qnap issue or a Syncthing issue - hoping there’s some smart cookie out there who can point me in the right direction!

I’m not overly familiar with Qnap units (I usually use Synology ones) - but I’ve recently had cause to setup Syncthing (v2.0.3) on a pair of them - and I’m running into a problem I’ve never seen elsewhere: sync is stopping with the error database or disk is full.

The Qnap with all the source files on it is quite happy thankyouverymuch - but the destination unit is stopping, despite there apparently being plenty of free space available. I’ve tried creating a new Qnap shared folder to receive all the data into - and this has failed too (though at about 350GB full rather than the original folder failing at 19TB full).

Here’s what I’m seeing in Syncthing:

…And here’s where the logs got to…

2025-08-28 01:47:02 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-06-06 13:14:29.0198254 +1000 EST" file.permissions=0777 file.size=1575465732 file.blocksize=1048576 blocks.local=0 blocks.download=1503 log.pkg=model)
2025-08-28 01:47:08 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-03-21 16:08:41 +1100 EST" file.permissions=0777 file.size=1754599220 file.blocksize=1048576 blocks.local=0 blocks.download=1674 log.pkg=model)
2025-08-28 01:47:19 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:40:26.5885941 +1100 EST" file.permissions=0777 file.size=1883126738 file.blocksize=1048576 blocks.local=0 blocks.download=1796 log.pkg=model)
2025-08-28 01:47:23 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 11:34:48 +1100 EST" file.permissions=0777 file.size=2211343291 file.blocksize=2097152 blocks.local=0 blocks.download=1055 log.pkg=model)
2025-08-28 01:47:37 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-01-15 22:53:18.6507958 +1100 EST" file.permissions=0777 file.size=2363421390 file.blocksize=2097152 blocks.local=0 blocks.download=1127 log.pkg=model)
2025-08-28 01:47:41 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:26:03.1019426 +1100 EST" file.permissions=0777 file.size=2461753362 file.blocksize=2097152 blocks.local=0 blocks.download=1174 log.pkg=model)
2025-08-28 01:48:01 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:46:34.7082179 +1100 EST" file.permissions=0777 file.size=2702992234 file.blocksize=2097152 blocks.local=0 blocks.download=1289 log.pkg=model)
2025-08-28 01:48:15 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 09:58:56 +1100 EST" file.permissions=0777 file.size=3769932224 file.blocksize=2097152 blocks.local=0 blocks.download=1798 log.pkg=model)
2025-08-28 01:48:28 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 10:05:40 +1100 EST" file.permissions=0777 file.size=4291500568 file.blocksize=4194304 blocks.local=0 blocks.download=1024 log.pkg=model)
2025-08-28 01:48:52 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-03-21 16:11:37 +1100 EST" file.permissions=0777 file.size=4638389748 file.blocksize=4194304 blocks.local=0 blocks.download=1106 log.pkg=model)
2025-08-28 01:49:04 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-01-15 22:56:53.9408045 +1100 EST" file.permissions=0777 file.size=4883857298 file.blocksize=4194304 blocks.local=0 blocks.download=1165 log.pkg=model)
2025-08-28 01:49:35 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-01-15 23:19:04.7828583 +1100 EST" file.permissions=0777 file.size=6304316210 file.blocksize=4194304 blocks.local=0 blocks.download=1504 log.pkg=model)
2025-08-28 01:49:55 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-07-09 16:04:55.880441042 +1000 EST" file.permissions=0777 file.size=7148353156 file.blocksize=4194304 blocks.local=0 blocks.download=1705 log.pkg=model)
2025-08-28 01:50:24 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:27:21.511657 +1100 EST" file.permissions=0777 file.size=8605174914 file.blocksize=8388608 blocks.local=0 blocks.download=1026 log.pkg=model)
2025-08-28 01:50:57 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2024-12-09 12:29:14 +1100 EST" file.permissions=0777 file.size=9162811040 file.blocksize=8388608 blocks.local=0 blocks.download=1093 log.pkg=model)
2025-08-28 01:53:13 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-03-21 16:24:53 +1100 EST" file.permissions=0777 file.size=13890234916 file.blocksize=8388608 blocks.local=0 blocks.download=1656 log.pkg=model)
2025-08-28 01:54:06 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:48:55.6638439 +1100 EST" file.permissions=0777 file.size=25057035864 file.blocksize=16777216 blocks.local=0 blocks.download=1494 log.pkg=model)
2025-08-28 01:56:08 INF Synced file (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly file.name="<filePathHere>" file.modified="2025-02-28 12:46:10.4222792 +1100 EST" file.permissions=0777 file.size=35504582626 file.blocksize=16777216 blocks.local=0 blocks.download=2117 log.pkg=model)
2025-08-28 01:56:12 INF Folder changed state (folder=aaaaa-bbbbb state=sync-preparing log.pkg=model)
2025-08-28 01:56:16 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:16 INF Folder failed to sync, will be retried (wait=55m9s folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:16 WRN Error on folder (error="database or disk is full" folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:16 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:56:17 INF Folder error cleared (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=sync-preparing log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:17 INF Folder failed to sync, will be retried (wait=1m0s folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:17 WRN Error on folder (error="database or disk is full" folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:17 INF Folder error cleared (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=scan-waiting log.pkg=model)
2025-08-28 01:56:17 INF Folder changed state (folder=aaaaa-bbbbb state=scanning log.pkg=model)
2025-08-28 01:56:28 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:28 INF Folder changed state (folder=aaaaa-bbbbb state=scan-waiting log.pkg=model)
2025-08-28 01:56:28 INF Folder changed state (folder=aaaaa-bbbbb state=scanning log.pkg=model)
2025-08-28 01:56:35 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:35 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:56:36 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:36 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:56:36 INF Folder changed state (folder=aaaaa-bbbbb state=sync-preparing log.pkg=model)
2025-08-28 01:56:36 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:56:36 INF Folder failed to sync, will be retried (wait=1m0s folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:56:36 WRN Error on folder (error="database or disk is full" folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:37 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:57:37 INF Folder error cleared (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:37 INF Folder changed state (folder=aaaaa-bbbbb state=sync-preparing log.pkg=model)
2025-08-28 01:57:37 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:57:37 INF Folder failed to sync, will be retried (wait=1m0s folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:37 WRN Error on folder (error="database or disk is full" folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:37 INF Folder error cleared (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:37 INF Folder changed state (folder=aaaaa-bbbbb state=scan-waiting log.pkg=model)
2025-08-28 01:57:37 INF Folder changed state (folder=aaaaa-bbbbb state=scanning log.pkg=model)
2025-08-28 01:57:44 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:57:44 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:57:44 INF Folder changed state (folder=aaaaa-bbbbb state=scan-waiting log.pkg=model)
2025-08-28 01:57:44 INF Folder changed state (folder=aaaaa-bbbbb state=scanning log.pkg=model)
2025-08-28 01:57:51 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:57:51 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:57:51 INF Folder changed state (folder=aaaaa-bbbbb state=sync-preparing log.pkg=model)
2025-08-28 01:57:51 INF Folder changed state (folder=aaaaa-bbbbb state=idle log.pkg=model)
2025-08-28 01:57:51 INF Folder failed to sync, will be retried (wait=2m0s folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:57:51 WRN Error on folder (error="database or disk is full" folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)
2025-08-28 01:59:36 WRN Failed to acquire open port (mapping=0.0.0.0:22000/UDP id=NAT-PMP@10.97.8.1 error="getting new lease on NAT-PMP@10.97.8.1 (external port 49052 -> internal port 22000): read udp 10.97.8.106:56657->10.97.8.1:5351: recvfrom: connection refused" log.pkg=nat)
2025-08-28 01:59:46 WRN Failed to acquire open port (mapping="[::]:22000/TCP" id=NAT-PMP@10.97.8.1 error="getting new lease on NAT-PMP@10.97.8.1 (external port 49052 -> internal port 22000): read udp 10.97.8.106:57898->10.97.8.1:5351: recvfrom: connection refused" log.pkg=nat)
2025-08-28 01:59:52 INF Folder changed state (folder=aaaaa-bbbbb state=sync-waiting log.pkg=model)
2025-08-28 01:59:52 INF Folder error cleared (folder.label=<folderLabel> folder.id=aaaaa-bbbbb folder.type=receiveonly log.pkg=model)

…And here’s what I’m seeing on the Qnap for the overall storage pool and the shared folder:

When this happened a bit earlier, restarting the NAS appeared to resolve it - for a short while. Now it’s not making any difference.

Any ideas how to troubleshoot this further?

Thanks!

calmh · August 27, 2025, 6:40pm

Apparently this is a SQLite error which seems as likely to mean the database is corrupt.

Moisie · August 28, 2025, 7:53am

Ahhh… thankyou!! I will delete the DB and try again!

I was convinced it was some hidden quota setting in the Qnap’s ZFS settings which I couldn’t find - but thanks for steering me yet again!

USRFSledge · August 28, 2025, 8:18am

Worrying though, taken that it is a fresh set up doing a first index/sync. Why would the DB get corrupt? Even twice? That seems quite uncommon to me.

My first thought on that same log entry was, that the DB is incorrectly stored on a non-data-share and actually running out of disk space.

Moisie · August 28, 2025, 1:51pm

Indeed - curious…

On this system, the syncthing config folder is stored in /share/ZFS530_DATA/.qpkg/syncthing/ - and running a df -k suggests it’s not out of space:


[localadmin@NAS-140 syncthing]$ df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
none                    442368    360052     82316  81% /
devtmpfs               6089744         4   6089740   0% /dev
tmpfs                    65536      1788     63748   3% /tmp
tmpfs                  6108432       156   6108276   0% /dev/shm
tmpfs                    16384         0     16384   0% /share
/dev/sdi5                 7928        47      7473   1% /mnt/boot_config
tmpfs                    16384         0     16384   0% /mnt/snapshot/export
/dev/md9                505300    165632    339668  33% /mnt/HDA_ROOT
zpool1               55435834428       250 55435834179   0% /zpool1
zpool256                392200       144    392056   0% /zpool256
zpool1/zfs1            1048576    183910    864666  18% /share/ZFS1_DATA
zpool1/zfs5          104857600      3510 104854090   0% /share/ZFS5_DATA
zpool1/zfs18         68987912192 20586480078 48401432114  30% /share/ZFS18_DATA
zpool1/zfs530        55437407268   1573090 55435834179   0% /share/ZFS530_DATA
cgroup_root            6108432         0   6108432   0% /sys/fs/cgroup
/dev/md13               426984    393432     33552  92% /mnt/ext
tmpfs                    32768     27900      4868  85% /samba_third_party
tmpfs                    49152        32     49120   0% /share/ZFS1_DATA/.samba/lock/msg.lock
df: /mnt/ext/opt/samba/private/msg.sock: Permission denied
zpool1/zfs18/RecentlySnapshot
                     55435834424       246 55435834179   0% /share/ZFS18_DATA/*****SharedFolder/@Recently-Snapshot
tmpfs                    29688     19260     10428  65% /mnt/ext/opt/FileStation5
/dev/loop0               29688     19260     10428  65% /mnt/ext/opt/FileStation5
tmpfs                    10240         0     10240   0% /tmp/wfm
zpool1/zfs19         53687091200 366429534 53320661666   1% /share/ZFS19_DATA
zpool1/zfs19/RecentlySnapshot
                     55435834384       206 55435834179   0% /share/ZFS19_DATA/********UP2/@Recently-Snapshot

Moisie · August 28, 2025, 2:04pm

I’ve just nuked the DB from orbit, and we’ll see what prevails.

Moisie · August 28, 2025, 3:25pm

Sadly nothing positive:

In case there’s any use in it, I see the following in my index-v2 folder:

[localadmin@NAS-140 index-v2]$ ls -lah
total 1016M
drwxrwx--- 2 admin administrators    8 2025-08-29 00:02 ./
drwxrwx--- 6 admin administrators   30 2025-08-29 00:02 ../
-rw-r--r-- 1 admin administrators 1.1G 2025-08-29 00:38 folder.0001-mdyzme37.db
-rw-r--r-- 1 admin administrators  32K 2025-08-29 00:49 folder.0001-mdyzme37.db-shm
-rw-r--r-- 1 admin administrators 8.0M 2025-08-29 00:49 folder.0001-mdyzme37.db-wal
-rw-r--r-- 1 admin administrators  36K 2025-08-29 00:57 main.db
-rw-r--r-- 1 admin administrators  32K 2025-08-29 00:59 main.db-shm
-rw-r--r-- 1 admin administrators 4.0M 2025-08-29 00:59 main.db-wal

…and the following when I get the database stats (if I’ve found the right incantation):

[localadmin@NAS-140 syncthing]$ sudo ./syncthing debug database-statistics --home=/share/ZFS530_DATA/.qpkg/syncthing
Password: 
DATABASE                 FOLDER ID    TABLE                                  SIZE     FILL
========                 ====== ==    =====                                  ====     ====
main.db                  -            folders                               4 KiB    1.2 %
main.db                  -            folders_database_name                 4 KiB    0.9 %
main.db                  -            kv                                    4 KiB   23.1 %
main.db                  -            schemamigrations                      4 KiB    3.3 %
main.db                  -            sqlite_autoindex_folders_1            4 KiB    0.6 %
main.db                  -            sqlite_autoindex_kv_1                 4 KiB   12.9 %
main.db                  -            sqlite_schema                         4 KiB   26.8 %
main.db                  -            sqlite_sequence                       4 KiB    0.5 %
main.db                  -            sqlite_stat1                          4 KiB    3.7 %
folder.0001-mdyzme37.db  arrkq-wqckd  blocklists                       888048 KiB   97.5 %
folder.0001-mdyzme37.db  arrkq-wqckd  blocks                            42728 KiB   99.5 %
folder.0001-mdyzme37.db  arrkq-wqckd  counts                                4 KiB    5.2 %
folder.0001-mdyzme37.db  arrkq-wqckd  devices                               4 KiB    3.7 %
folder.0001-mdyzme37.db  arrkq-wqckd  fileinfos                         23188 KiB   96.7 %
folder.0001-mdyzme37.db  arrkq-wqckd  files                             21932 KiB   96.9 %
folder.0001-mdyzme37.db  arrkq-wqckd  files_blocklist_hash_only          3464 KiB   89.4 %
folder.0001-mdyzme37.db  arrkq-wqckd  files_device_name                 17996 KiB   80.2 %
folder.0001-mdyzme37.db  arrkq-wqckd  files_name_only                   17624 KiB   80.9 %
folder.0001-mdyzme37.db  arrkq-wqckd  files_remote_sequence              1248 KiB   87.2 %
folder.0001-mdyzme37.db  arrkq-wqckd  indexids                              4 KiB    1.5 %
folder.0001-mdyzme37.db  arrkq-wqckd  kv                                    4 KiB    0.8 %
folder.0001-mdyzme37.db  arrkq-wqckd  mtimes                                4 KiB    0.2 %
folder.0001-mdyzme37.db  arrkq-wqckd  schemamigrations                      4 KiB    3.3 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_autoindex_blocklists_1      2648 KiB   89.3 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_autoindex_blocks_1         43468 KiB   88.6 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_autoindex_devices_1            4 KiB    3.6 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_autoindex_kv_1                 4 KiB    0.6 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_schema                        12 KiB   44.8 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_sequence                       4 KiB    1.0 %
folder.0001-mdyzme37.db  arrkq-wqckd  sqlite_stat1                          4 KiB   10.9 %
folder.0001-mdyzme37.db  arrkq-wqckd  (total)                         1062396 KiB   96.5 %
main.db + children       -            (total)                         1062432 KiB   96.5 %

calmh · August 28, 2025, 3:32pm

Support bundle?

Moisie · August 28, 2025, 3:36pm

[Support bundle sent privately]

calmh · August 28, 2025, 5:40pm

Support bundle doesn’t really give more clues than it just suddenly starts happening. Googling the error indicates that it can also have to do with various temporary storage locations being full. I don’t see /tmp being full in your paste above, but perhaps there are additional quotas, memory limits, container mounts, something happening when Syncthing is started?

Moisie · August 28, 2025, 7:04pm

Thanks Jakob - I do appreciate your looking into it.

I saw references to /tmp too - but unless it’s a very spiky fill-and-then-empty occurrence, I’m seeing much the same level of usage during the problem as noted earlier (it’s also almost-identical to this Qnap’s companion, which is working quite happily thankyou):

I suspect I’m not going to be able to bring much more to bear on this, and as it’s clearly not a widespread issue, I’ll probably roll back to v1 and live with it there. I’m hopeful this Qnap will be replaced at some point soon anyway, at which point it will all become academic anyway.

gadget · August 30, 2025, 1:43am

Moisie:

[localadmin@NAS-140 syncthing]$ df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
none                    442368    360052     82316  81% /
devtmpfs               6089744         4   6089740   0% /dev
tmpfs                    65536      1788     63748   3% /tmp

Although /tmp usage was low at the time of the output above, the capacity is only 65MB, which is unusually low.

When /tmp is a ramdisk (indicted by the “tmpfs” filesystem) instead of on-disk, it’s often a percentage of system RAM, commonly 50%.

What model QNAP is it and what does the free command say?

Moisie · August 31, 2025, 8:49pm

Hi @gadget - thanks for your input.

I compared this with this NAS’s sibling, and the capacity on /tmp was the same; I didn’t personally set either system up from scratch, but I doubt anything unusual would have been configured here - it’s probably just the Qnap default.

It’s a QNAP TS-873A, with 12GB RAM installed.

Probably irrelevant as I’ve now removed v2.0.3 and installed v1.30.0 instead - running without issue so far - but free currently reports:

[localadmin@NAS-140 ~]$ free
             total       used       free     shared    buffers     cached
Mem:      12216864    9312576    2904288     415044      35864     963320
-/+ buffers/cache:    8313392    3903472
Swap:     63736824          0   63736824

calmh · August 31, 2025, 9:03pm

This may or may not be useful, but since the error is via SQLite and appears resource related… I’ve seen cases where problems like thread limits, file descriptor limits, etc end up reported as general ”ENOSPC” type errors that look like out of disk space.

rebelman · September 7, 2025, 10:37am

Hi there. Same problem here. I have a TS-873A with 64 GB RAM, 50 TB free space, enough inodes left. Same error (disk or database full). 4 other folders between the two machines synced without issues before (the other Device is a Win PC with current SyncTrayzor). To be more detailed for the QNAP: Its the Syncthing Version 2.06 from MyQnap, in this case the root version. Any hope to have this be handled?

calmh · September 7, 2025, 11:04am

I’ve narrowed this down to likely be caused by a tiny /tmp (64 MB?) where SQLite wants to store temp files for large queries. We can work around that in various ways, none of them super palatable, but we’ll find something. In the meantime, you can try launching with the SQLITE_TMPDIR env var set to an existing, writeable directory with more space in it…

github.com/syncthing/syncthing

database or disk is full

opened 02:26PM - 05 Sep 25 UTC

Orca75

bug needs-triage

### What happened? syncthing tells me "database or disk is full" the disk can't… be full: pwd /share/CACHEDEV2_DATA/.qpkg/SyncThing/index-v2 df Filesystem Size Used Available Use% Mounted on tmpfs 64.0M 35.4M 28.6M 55% /tmp /dev/mapper/cachedev2 12.8T 1.6T 11.2T 13% /share/CACHEDEV2_DATA <html> <body> Folder ID | m9xvj-celqf -- | -- /share/Backups/LENOVO-Chris database or disk is full 507’744 57’062 ~605 GiB 15’818 30’676 ~52.2 GiB 518’312 items, ~553 GiB Receive Only </body> </html> it changes always between Preparing to Sync and Waiting to Sync. [support-bundle-4FKKX5H-2025-09-05T160349.zip](https://github.com/user-attachments/files/22173676/support-bundle-4FKKX5H-2025-09-05T160349.zip)Folder ID m9xvj-celqf Folder Path /share/Backups/LENOVO-Chris Error database or disk is full Global State 507’744 57’062 ~605 GiB Local State 15’818 30’676 ~52.2 GiB Out of Sync Items [518’312 items, ~553 GiB](https://192.168.99.122:8384/) Folder Type Receive Only ### Syncthing version 2.0.7 ### Platform & operating system Linux (64-bit Intel/AMD) ### Browser version _No response_ ### Relevant log output ```shell see added support-bundle file ```

calmh · September 7, 2025, 11:41am

Likely fix:

rebelman · September 7, 2025, 12:57pm

Thank you very much for your efforts! Unfortuanatly I dont know how to change this env variable on the QNAP, but I saw the progress in the change logs and look forward A change of the backend is possibly a very big thing. Thanks.

rebelman · September 9, 2025, 2:23pm

The commit is through … it worked immediatly. Thanks again

system · October 9, 2025, 2:24pm

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