One orangepi has data corruption on power outage, other not

[Horst]

 

Hi everyone,

 

Two Questions:

 

1) I have two Orange Pi 3 LTS boards at home. I installed AdGuard Home on one, serving as DHCP (I'll call it OP1),

and on the other, I left a Docker with other apps (qbittorrent, omv6, samba, etc. - I'll call it OP2).

 

Both are installed via SD card. But if there's a power outage, OP1 works normally again after, without any problems.

 

But OP2, on the other hand, has experienced data corruption several times.

Does anyone know why OP1 works fine and OP2 runs the risk of having to reinstall the system in such a case?

 

2) If I used a board with EMMC memory and unified all the systems on it, would the chances of this decrease, or is it unrelated?

I see other people with same problem. Only using a UPS to prevent the OP2 problem?

 

Thanks

[Werner]

data corruption can always happen when there is a power outage. Could be by chance that one device suffered while the other didn't.

Best way to prevent is as guessed a small PSU which ideally tells the device 'there is an outtage, please shut down before I run out of battery".

 

Having OS or data or microSD, eMMC or NVMe does not make a difference since the OS decides when and how often data is written. NVMe are even more fragile since they often come with an internal cache themselves that is emptied onto the actual flash asynchronously. 

Disabling write caches may lower chances for data corruption but for once can decrease performance a lot and for the other significantly decreases the lifetime of microSD cards.