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Re: [Veritas-bu] RedHat Ent 5 Kernal 2.6 on NBU 6.5
2010-04-20 10:35:18
On Tue, Apr 20, 2010 at 8:53 AM, WEAVER, Simon (external) <simon.weaver AT astrium.eads DOT net> wrote:
Setup - Win2k3 SP2 Master and new RedHat5 Server, as VM. Tape Drives are LTO4 in Robotic Sun Library.
Currently holds 2TB's data
question. Backups over lan for this VM takes around 15hours.
Files are a real variety of sizes. Without paying out anything additional, is there anything on the client I could look at, or make changes like buffer settings.
With a recent version of NBU, the default buffer sizes are typically pretty good.
This is a standard client. Not dealt with Linux, so steep learning curve.
Assume you a single Gigabit NIC. Assume that you can get 70% throughput on that NIC. That means you'll top out at 70MB/sec. You have 2,000,000MB to back up. That's 28,571 seconds or 8 hours. So that's the absolute best you can ever hope for and that's assuming that you have a master server that is doing no other traffic on that interface and that your VM has no other traffic on its dedicated backup interface - including backing up other VMs.
Now 70MB/sec is going to be next to impossible to get if you have lots of small files. Large files - perhaps, but small files - not a chance. If you have lots of small files, the solution is the same as it would be on Windows - use the snapshot client.
Without knowing a lot more about your environment, it's possible that you're already doing as good as you're going to get. I am also assuming that you've done the obvious and had a really good look to see if you need to back that 2TB up at one shot or if you can break it up into smaller pieces (or not do fulls at all by utilizing synthetics or other approaches).
..../Ed _______________________________________________
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