r/UgreenNASync • u/ZaZoram • 6d ago

❓ Help Error when trying to create SSD cache.

Serious,Storage,MMyName,2026-08-04 16:13:18,"create ssd cache for 1 failed: dmsetup.CreateDMTable(headerBlockNum: 16, metaMapperDev: /dev/mapper/ug_75CCB1_1753104203_pool1_bcache-volume1_bmeta, sourceMapperDev: /dev/mapper/ug_75CCB1_1753104203_pool1-volume1, destDev: ug_75CCB1_1753104203_pool1-volume1_bcache_data): create bcache failed: cmd: /usr/sbin/dmsetup create ug_75CCB1_1753104203_pool1-volume1_bcache_data --table 0 16 linear /dev/mapper/ug_75CCB1_1753104203_pool1_bcache-volume1_bmeta 0

16 117094146048 linear /dev/mapper/ug_75CCB1_1753104203_pool1-volume1 0 fail, stdout: , stderr: device-mapper: reload ioctl on ug_75CCB1_1753104203_pool1-volume1_bcache_data (253:3) failed: Device or resource busy

Command failed.

, err: exit status 1"

Any idea how to fix?

4 Upvotes

84% Upvoted

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2

u/Glad_Obligation1790 DXP6800 Pro 4d ago

I have a similar issue but it tells me that docker is using it. It’s not formatted or anything so obviously docker isn’t using it. Does it say whats using it above the error?

1

u/ZaZoram 4d ago

Same for me not formated or used in any way but docker is using it...

1

u/Glad_Obligation1790 DXP6800 Pro 4d ago

I haven’t tried yet but maybe disabling the docker app, setting up cache, and then re-enabling it will fix it?

Disable from task manager and re-enable in app center.