On Sat, Mar 05, 2016 at 12:34:09PM -0700, Chris Murphy wrote:
> I can't tell what this btrfs-balance script is doing because not every
> btrfs balance command is in the log.
It is. I wrote it to produce reproducible logs.
[1/499]mh@fan:~$ cat btrfs-balance
#!/bin/bash
FS="/mnt/fanbtr"
showdf() {
logger -- btrfs fi df $FS
btrfs fi df $FS 2>&1 | logger
logger -- btrfs fi show /
btrfs fi show / | logger
logger -- btrfs fi usage /
btrfs fi usage / | logger
}
logger -- BEGIN btrfs-balance script
showdf
btrfs balance start $FS 2>&1 | logger
showdf
logger -- BEGIN btrfs balance start -dprofiles=single $FS
btrfs balance start -dprofiles=single $FS 2>&1 | logger
showdf
logger -- BEGIN btrfs balance start -mprofiles=dup $FS
btrfs balance start -mprofiles=dup $FS 2>&1 | logger
showdf
logger -- BEGIN btrfs balance start --force -sprofiles=dup $FS
btrfs balance start --force -sprofiles=dup $FS 2>&1 | logger
showdf
logger -- BEGIN btrfs balance start $FS
btrfs balance start $FS 2>&1 | logger
showdf
logger -- END btrfs-balance script
[2/500]mh@fan:~$
I see. The logger -- BEGIN is missing for the very first command. My
bad.
> Something is happening with the usage of this file system that's out
> of the ordinary. This is the first time I've seen such a large amount
> of unused metadata allocation. And then for it not only fail to
> balance, but for the allocation amount to increase is a first.
It is just a root filesystem of a workstation running Debian Linux, in
daily use, with daily snapshots of the system, and
ten-minute-increment snapshots of /home, with no cleanup happening for
a few months.
> So understanding the usage is important to figuring out what's
> happening. I'd file a bug and include as much information on how the
> fs got into this state as possible. And also if possible make a
> btrfs-image using the proper flags to blot out the filenames for
> privacy.
That would btrfs-image -s?
> And what btrfs-progs tools were used to create this file system. Etc.
The file system is at least two years old, I do not remember, which
version of btrfs-tools was in Debian unstable back then. Is this
information somewhere in the filesystem label? How do I obtain this one?
> The alternative if this can't be fixed, is to recreate the filesystem
> because there's no practical way yet to migrate so many snapshots to a
> new file system.
I am now back to a mid three-digit number of snapshots.
Greetings
Marc
--
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Marc Haber | "I don't trust Computers. They | Mailadresse im Header
Leimen, Germany | lose things." Winona Ryder | Fon: *49 6224 1600402
Nordisch by Nature | How to make an American Quilt | Fax: *49 6224 1600421
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