On 05/16/2015 12:37 AM, Christian wrote:
On 05/15/2015 12:20 PM, Anand Jain wrote:


On 05/15/2015 08:09 AM, Christian wrote:
Hi,

My laptop has a small ext4 /boot partition /dev/sda1 and a large btrfs
partition containing / and /home as a sub volume /dev/sda3

When I run scrub on /dev/sda3 and check status with sudo btrfs scrub
status -d /dev/sda3 I get:

scrub status for 3d52dc93-c89f-453f-965d-8601d11e7710
scrub device /dev/sda3 (id 1) history
     scrub started at Thu May 14 19:54:02 2015 and finished after 235
seconds
     total bytes scrubbed: 111.03GiB with 0 errors
scrub device  (id 0) history
     scrub started at Thu May 14 19:54:02 2015 and was aborted after 0
seconds
     total bytes scrubbed: 0.00B with 0 errors

  we are reading an uninitialized device struct and that uninitialized
  devid happens to be 0. looks like num_devices count went haywire.

  in this config was there any device delete ? or a reduce in # of
  devices? and has the system been rebooted after that ?

Thanks, Anand

Not sure I understand fully what you are asking, but I deleted a swap
partition on the drive a while back and increased the size of the btrfs
partition (with gparted). I have rebooted many times since then. That is
all the changes I have done to this SSD recently.

 ok got it. now do you have any other disk in the system with the same
 fsid ? what does the btrfs fi show -d or blkid show.

Thanks


Thanks.


As device (id 0) is indicated, but I have no idea what it is.

When I run scrub with a script (cron) the same device (id 0) shows up in
a warning:

/etc/cron.daily/btrfs-scrub:
WARNING: device 0 not present
scrub device /dev/sda3 (id 1) done
     scrub started at Sat May  2 08:03:46 2015 and finished after 241
seconds
     total bytes scrubbed: 109.06GiB with 0 errors
scrub device  (id 0) canceled
     scrub started at Sat May  2 08:03:46 2015 and was aborted after 0
seconds
     total bytes scrubbed: 0.00B with 0 errors

What is this device (id 0) which never gets scrubbed but always shows
up?

I'm running Ubuntu 15.04 with the 3.19.0-16-generic kernel.

P.S. I am not a developer.

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