Appliance for Raspberry Pi 4: Input/output error (code: 5)

infscape-appliance
1

Hi there,
while processing a 120 GB full file backup of a Windows 10 client suddenly an error appeared somewhere in the step “Encrypting and uploading to the cloud” :

myraspi4: Error reading from file on cache - 09/18/21 14:48 (myraspi4)
Read error while reading from file /var/cdcache/cache/trans_16/6272/62720a at position 389120 len 32768 for compression and encryption. Input/output error (code: 5)
Automatic repair action: Resetting cache, then rebooting.
Automatic cache reset failed. Please contact support.

So there was no more noticable activity “Encrypting and uploading to the cloud” and so I rebooted the Raspberry and then “Encrypting and uploading to the cloud” started again.
However, is my cloud backup still consistent or is it damaged? Besides that, how could I avoid such an error?
Thanks in advance for a hint on this.

2

Look at /var/log/kern.log about why it got an “Input/output error”. Storage should still be good.

3

Thanks for the quick reply.
I just received again this error:
Read error while reading from file /var/cdcache/cache/trans_16/6272/62720a at position 389120 len 32768 for compression and encryption. Input/output error (code: 5)
Looking at my kern.log reveals some BTRFS errors.
Could you interpret these errors?

4

Sep 18 18:28:21 myraspi4 kernel: [ 7460.353369] BTRFS warning (device dm-0): csum failed root 353 ino 205493 off 389120 csum 0x684def90 expected csum 0xf46462ec mirror 1

Checksum error. Do what the automatic reset is supposed to do (and fails in this rpi configuration):

systemctl stop tclouddrive
btrfs subvol del /var/cdcache/cache/trans_*
init 6

If you get those checksum errors often consider using another disk as cache (or power supply etc. ).

5

Thanks uroni for the explanations.
I applied the commands and there was no error while executing them. I will monitor the situation the next days and report back in case the checksum errors appear again. However the SSD is a less than a month old …

6

Did you have any further issues? We are facing this issue as well and haven’t been able to track it down yet.

7

Hello meichthys,
well, the checksum errors did not come back but I decided a few days later in order to be on the safe side to make a clean new installation of the appliance. Since then I never saw theses error again. Hope you get theses issue solved on your system.