DragonFly bugs List (threaded) for 2009-04
DragonFly BSD
DragonFly bugs List (threaded) for 2009-04
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Re: Still looking for reports of missed directory entries w/ HAMMER

From: Francois Tigeot <ftigeot@xxxxxxxxxxxx>
Date: Wed, 22 Apr 2009 00:01:56 +0200

On Tue, Apr 21, 2009 at 09:56:47AM -0700, Matthew Dillon wrote:
>     Here's another question:  How many rsnapshots or rsyncs are running
>     on the destination machine at the same time?  Are you backing up
>     all your other machines and partitions in parallel to the target box?

This machine is pretty much dedicated to backup and file serving.

- it runs rsnapshot every 4 hours on the problematic filesystem.
Each rsnapshot run gets files in sequence from 7 different machines and 34
directory trees.
The target is a 400GB Hammer filesystem on a RAID1 volume (3Ware SATA). This
filesystem is mounted nohistory.
Rsnapshot takes a _long_ time to rotate its hourly directory snapshots
(directory deletion and re-creation, hard-links). My guess would be about 20
minutes per run for this part.

Time spent running rsync is quite short in comparison; this filesystem is only
running at most one instance of rsync.

- every 5 hours it runs a different rsync sequence and gets files from 6
machines and 28 remote directories
The target filesystem is a 250GB Hammer volume on a stand-alone SATA disk.
There is no special directory rotation, directories are always synchronized in
the same place; Hammer snapshots are used for history.
I have no trouble with this filesystem.

Apart from the backup activities, this machine exports some others (different
from the 2 backup fs above) filesystem with NFS. They are lightly used, and
then mainly for reading.

Francois Tigeot

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