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Backup and restore using NAS

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I am using a NAS server to do backup of my computer. Full backup takes about 8 hours (about 2 TB data), which is a long time, but I can live with it.

I had to do a restore of my data disk after changing RAID controller, and I then used the Win PE based Rescue Media, since the standard Rescue Media does not support RAID. I did the following procedure:

1. Boot form Rescue Media
2. Map the NAS server: net use K: \user=<user name> \\<address>\directory *
3. Found the correct backup on the NAS server
4. Choose restore disk
5. Choose disk target

Restore started, and the whole restore process took nearly 40 hours!

Is this what I must expect (the data disk was 2.7 TB) or is there something I am missing?

Best regards

Ulf 

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Your 1.7 Terabytes of data equates to roughly 1,700,000 Megabytes.  Your 40 hours equals 24,000 minutes.  MB divided by minutes equals 70.83 MBpm. MBpm divided by seconds equals 1.18MBps.

Not a good showing.  I would suspect network limitations are the cause. That cause could be any number of things unfortunately.  Network hardware, network configuration, disk drive limitation and more can be considered suspect.  

If you are running a gigabit network you should ascertain if in fact you are truly getting gigabit speed out of it.  Below is link to a lite weight tool to measure LAN speed without Windows caching involved so that you can get a good picture of what performance really is.

http://www.totusoft.com/lanspeed.html

 

Thank you so much for your reply.

I have tried to copy files from the NAS to the disk involved when system is online. The result (using Microsoft System Monitor) shows me a throughput of 30 MB/s for large files and about 10 MB/s for small files, so this is totally different from  what I see from the restore. The que length is never much more than 3.

I am not sure what kind of network drivers that are used when I boot the Win PE based Rescue Media, so this might be an issue. The other thing that could be a problem, though I cannot imagine such a big impact, is that I had the RAID-5 set configured with Write Through instead of Write Back (I do have a battery pack on the controller!).

 

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