Re: [BackupPC-users] serial or parallel backups

2011-06-27 Thread Dan Pritts
What is your i/o subsystem? I have a striped array (raid 0) over two raid 6 arrays with 7 drives in each array, so effectively I have 10 spindles. With this I can handle more i/o load than if I only had one drive. I'm sure that John knows this, but for the benefit of the OP i'll note that

Re: [BackupPC-users] serial or parallel backups

2011-06-27 Thread Les Mikesell
On 6/27/2011 3:40 PM, Dan Pritts wrote: Multiple I/O streams can probably make better use of your I/O bandwidth than can a single serial one, unless you are running on low-end hardware like a USB drive. One other point that I don't think has been mentioned yet is that if you have

[BackupPC-users] serial or parallel backups

2011-06-26 Thread Chris Baker
I have been wondering about this for a while. Am I better off having backups run parallel or in series? By running in series, I mean one backup runs at a time. When it finishes, another one starts. By running parallel, I mean that several backups run at once. It seems that when backups have to

Re: [BackupPC-users] serial or parallel backups

2011-06-26 Thread Steve
I just depends on any particular setup, and what the most limiting factor is. Sound like for you it's bandwidth, but that may not always be true, even for you, depending on how much your data changes from backup to backup and things like that. I would argue that if you have so few machines that

Re: [BackupPC-users] serial or parallel backups

2011-06-26 Thread John Rouillard
On Sun, Jun 26, 2011 at 03:48:20PM -0500, Chris Baker wrote: I have been wondering about this for a while. Am I better off having backups run parallel or in series? By running in series, I mean one backup runs at a time. When it finishes, another one starts. By running parallel, I mean