Relative backup speeds

[Bob Cousins]

I've got a new Bareos 21 installation working well thanks to the kind help from this group.

In my configuration, I have two windows machines. One is an old windows 7 machine, one a new windows 10 machine. Both are 100% SSD and idle.

Why does the Windows 7 machine backup at 50 kilobytes/second while the Windows 10 machine varies from 1.5 megabytes/second to 3 megabytes/second? The network is 100% switched gigabit ethernet. Both machines normally can transfer in the 100 megabyte/second speed via the network.

At 50 KB/second, a full backup could take a week or more.

I used to run a much older Bareos configuration a year or so ago and it backed up at megabyte speeds on both machines. Clearly, I'm doing something really wrong here.

Could someone give me a clue, please?

[Brock Palen]

That’s way below what I have seen for many years with the windows client.

I would grab iperf and check network performance across the same path between the client and the storage daemon.

When the backup is running is CPU use high on the client? You may have compression turned on and that can become CPU bound because compression is single threaded in Bareos and can actually slow things, but this is much to slow slow to be that most likely. If it is you can ether lower compression, or use a fast compression like lz4.

It’s not bareos but I did a compression speed comparison at my work with research data, lz4 is by far the fastest single threaded compression.




Brock Palen
bro...@mlds-networks.com
www.mlds-networks.com
Websites, Linux, Hosting, Joomla, Consulting

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[Bob Cousins]

Brock:

   Thanks for you help.

    I just *KNOW* my network is solid. So I ran iperf3 and found that the machine in question had gigabit download speed and barely a megabit upstream. This is enough upstream for most things to operate and to support fast downloads. But it would cause Bareos to backup very slowly. So my network was broken -- famous last words.

    Thanks again to this group for timely, on point assistance.