A Question: What Happens on a Power Outage During Parity Built?

[Gico]

I replaced both parity disks and began parity built. It should take more than 3 days.

What happens if a power outage happens during the parity built?

Does it have to be started from beginning or it continues from where it reached before the outage?

I have a UPS that lasts for few minutes,

but I moved to a new flat in which power supply is occasionally fails to supply my home's power consumption.

[JorgeB]

7 minutes ago, Gico said:

Does it have to be started from beginning

^This

[itimpi]

The Parity Check Tuning plugin may be able to restart the check if the UPS allows you to do a clean shutdown as long as you enable the restart option in the plugin settings.    Having said that I have never checked if the restart option works for building parity or simply for checking parity (which is the Use Case I know works).   If it is currently only working for checking parity I must see if I can also get it to work when building parity.

[Gico]

Thanks. I'll investigate/prepare this option if this would be the last resort.

[itimpi]

25 minutes ago, Gico said:

Thanks. I'll investigate/prepare this option if this would be the last resort.

I’ve checked the code and at the moment it only allows for resuming a parity check from the last position reached after a reboot or array stop/start.

 

I will need do some investigation to see whether the plugin can be enhanced to allow a similar capability to be extended to drive rebuilds and/or parity syncs (builds)

.

[Gico]

Thanks. How does "Use increments for Parity-Sync/Data Rebuild operations" option should be used?

Can/Could it be set to Parity-sync with increments,

so that after every increment reached I can/could manually set it to start the next increment,

so I would risk only losing progress from the last increment?

[itimpi]

17 minutes ago, Gico said:

Thanks. How does "Use increments for Parity-Sync/Data Rebuild operations" option should be used?

Can/Could it be set to Parity-sync with increments,

so that after every increment reached I can/could manually set it to start the next increment,

so I would risk only losing progress from the last increment?

No, unfortunately that will not work.   That option is only about automatically pausing/resuming a running operation, not about restarting it from the point reached after a reboot or array start/stop which is what you want.