Hello,
I have a quite simple and possibly stupid question. Since I'm
occasionally seeing warnings about failed loading of free space cache, I
wanted to clear and rebuild space cache. So I mounted the filesystem(s)
with -o clear_cache and subsequently with my regular options which
includes space_cache. Indeed, dmesg tells me:
[ 60.285190] BTRFS info (device dm-1): force clearing of disk cache
and then
[ 137.151845] BTRFS info (device dm-1): use ssd allocation scheme
[ 137.151850] BTRFS info (device dm-1): disk space caching is enabled
[ 137.151852] BTRFS info (device dm-1): has skinny extents
To my understanding, btrfs-freespace should then start working to
rebuild the free space cache. However, I can't remember that I have ever
seen btrfs work hard after clearing the space cache. The drives aren't
working much, and the btrfs-freespace processes (which are indeed there)
don't do anything either.
So simple question: Can anyone try to clear their space cache and
confirm that btrfs actually does something after doing so? Is there
anything I could do to confirm that something is happening?
The drives in question are a SSD and a HDD, both in the range of 1-2 TB
in size.
I'm on Arch Linux, kernel 4.12.3, btrfs-progs 4.11.1
Best regards
Sebastian
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