[Dirvish] Dirvish speed and security

[Eric Mountain]

On Monday 26 May 2008, Shawn (Red Mop) spake thus:
> List of questions:
>
> What kind of link are you backing up over?
> Are you backing up over nfs, or rsync/ssh?
> Are you using ssh (-C) or rsync (-z) compression?
> Do you have the --whole-file or --checksum settings selected?
> How much I/O are the drives containing the file systems in question under
> during the backup period when the backup is not running compared to how
> fast they can go?
> What file systems are you using on the backup server and client?
> What settings (size, journal type, mount options, block sizes, inodes, etc)
> are those file systems?
> How badly fragmented are those file systems?

And:

- What speed is the network you are backing to?
- What is the existing load on the network?
- Have you tried measuring the raw capacity of your network in copying files?  
e.g. copying 1Mb files across the network repeatedly, what is the sustained 
throughput (esp. at the times during which your backups run)?
- Is there traffic shaping or any other bandwidth limiting technology on the 
network that might have an impact?

-- 
Eric Mountain