I do not have a direct answer to your question, but I can chime in on your scrub times: I have 4x8TB, 4x10TB, and 8x3TB drives, all in one huge BTRFS ‘RAID1’. I can tell you that even in my setup, scrubs usually take less than a day. So unless it’s the raid5 making yours take so long, that does not sound typical. > On Jan 8, 2020, at 2:13 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. >
