On 2014/05/05 02:54 AM, Marc MERLIN wrote:
More slides, more questions, sorry :)
(thanks for the other answers, I'm still going through them)
If I have:
gandalfthegreat:~# btrfs fi show
Label: 'btrfs_pool1' uuid: 873d526c-e911-4234-af1b-239889cd143d
Total devices 1 FS bytes used 214.44GB
devid 1 size 231.02GB used 231.02GB path /dev/dm-0
I'm a bit confused.
It tells me
1) FS uses 214GB out of 231GB
2) Device uses 231GB out of 231GB
I understand how the device can use less than the FS if you have
multiple devices that share a filesystem.
But I'm not sure how a filesystem can use less than what's being used on
a single device.
Similarly, my current laptop shows:
legolas:~# btrfs fi show
Label: btrfs_pool1 uuid: 4850ee22-bf32-4131-a841-02abdb4a5ba6
Total devices 1 FS bytes used 442.17GiB
devid 1 size 865.01GiB used 751.04GiB path /dev/mapper/cryptroot
So, am I 100GB from being full, or am I really only using 442GB out of 865GB?
If so, what does the device used value really mean if it can be that
much higher than the filesystem used value?
Thanks,
Marc
The "per-device" used amount refers to the amount of space that has been
allocated to chunks. That first one probably needs a balance. Btrfs
doesn't behave very well when available diskspace is so low due to the
fact that it cannot allocate any new chunks. An attempt to allocate a
new chunk will result in ENOSPC errors.
The "Total" bytes used refers to the total actual data that is stored.
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Brendan Hide
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