On 2012-05-30 00:27, Brad Alexander wrote:
> I know it is bad form to respond to one's own post, but I was digging
> around in my Munin graphs, and noticed that the filesystem skyrocked
> from about 70% to 100% late on the 26th or early on the 27th. I have
> included both the 4-week pool graph from the backup machine and the
> weekly graph from my munin server. Note that while the pool filesystem
> is smooth and even at around 300GB, the munin graph climbs sharply...

This indicates the disk usage is outside the pool.

Using du on these directories would be bad (take a long time, not be
helpful due to hard links): cpool pool pc

Everything else you can check. Please do so first.

1. Do you have anything else in this filesystem, or is it mounted on
/var/lib/backuppc?

2. Check a few backups made during the window that usage increased. Are
they linked into the pool? For instance:

root@backup:/var/lib/backuppc/pc/router07/547# stat f%2f/fvar/flog/fsyslog
  File: `f%2f/fvar/flog/fsyslog'
  Size: 20440           Blocks: 40         IO Block: 4096   regular file
Device: fb00h/64256d    Inode: 105783860   Links: 2
Access: (0640/-rw-r-----)  Uid: (  106/backuppc)   Gid: (  116/backuppc)
Access: 2012-05-24 00:08:56.727735552 +0000
Modify: 2012-05-25 02:31:52.655574930 +0000
Change: 2012-05-25 02:31:52.655574930 +0000

This is a file that is unique on every host, but it has two links. Meaning
it exists here in the pc directory, and in the pool. If this is 1, this
backup is not linked into the pool and is contributing to this usage problem.

Regards,
Tyler

-- 
A bad analogy is like a leaky screwdriver.

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