Re: Uncorrectable errors after rebooting with Magic Sysrq Keys

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Hi,
Is it 100% safe to run a btrfs check without --repair?
Because otherwise I will have to wait for my new external drive to arrive and make a backup first.

Thanks,
Niccolò

On venerdì 15 aprile 2016 11:30:32 CEST, Qu Wenruo wrote:
Would you please run "btrfs check --readonly <your dm0>" and paste the output?

The dmesg seems very impossible:

BTRFS error (device dm-0): bad tree block start 245497856 245498111

The later one is not even aligned to 2.

But you system still seems mountable as you succeeded in running btrfs scrub.

So I assume either the tree block is not a critical one or the copy saved you.

Thanks,
Qu
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