Re: How long should a btrfs scrub with RAID5/6 take?

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On Wed, Jan 8, 2020 at 3:19 AM Robert Krig
<robert.krig@xxxxxxxxxxxxxxxxxx> wrote:
>
> Hi, I've got a server where I have 4x8TB Disks in a BTRFS RAID5
> (metadata and systemdata as RAID1) configuration.
>
> It's just a backup server with data I can always recreate.
> This server is in the bedroom, so I send it to sleep/suspend when I go
> to bed and then wake it up in the morning.
>
> Since a scrub takes days on such a setup, I issue a btrfs scrub resume
> whenever the server wakes up again.
>
> btrfs scrub status shows me that the total data to scrub is 18.67TB,
> but it's already scrubbed 36.60TB. Is there any way I can calculate how
> much more data is going to be scrubbed? 4x8TB is 32TB, so we're passed
> that, but I'm guessing this also has to do with parity data as well.
>

What kernel version and btrfs-progs version? Recent btrfs progs has a
new output that shows more info including a time to completion
estimate. Can you post the output from 'btrfs scrub status
/mountpoint/' ?

-- 
Chris Murphy



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