Backup performance

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I was wondering why it took 22 hours to back up a little over 1 TB to a 1.5TB Seagate FreeAgent Xtreme that supports
up to 400 Mb/s (FireWire 400). Is this the sort of backup time you would expect?

Thanks

Sun, 06/20/2010 - 00:53
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Was this in Windows or from the TI CD?

What version and build of TI are you using?

Normally, you can expect around 1-1.5GB/min. to USB 2. FireWire 400 should be around the same or maybe a little faster.

Does the drive have a USB 2 connection you could try?

Sun, 06/20/2010 - 01:03
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In Windows 7.
Acronis True Image Home 2010 (build 6.053).
It doesn't seem right that the software can only handle 1GB/min when the hardware can handle 23GB/min.
I would think it should only take about an hour to back up 1 TB with a Firewire 400 back up drive, not 22 hours.
Why do you say I can expect around 1-1.5GB/min? Where does this figure come from?

Thanks

Mon, 06/21/2010 - 13:55
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The figure Mudcrab gave is typical of what is achieved ona great many machines.

There are bottlenecks in the system besides the Firewire max-speed rating, and there is overhead from diff factors, so I have to ask where you get the 23GB/min from, from the max raw data speed rating for firewire 400? Firewire 400 maxes out at a nominal 400 mbits/second (actually 393.216 Mb/s) but that's a "burst" speed, not a sustained real world speed. Expect toe actually get something much much slower (probably no better than about one half that speeed and perhaps a little as one tenth that speed) when doing a prolonged transfer -- or in fact, almost any actual transfer.

But in any event, even at the speeds Mudcrab stated, you should get at least twice the backup speed you're seeing.

fist question is: Was the backup done form winthin windows or from the bootCD?
How much of the hdisk/partition is occupoed with data and how much is free space?
Was the Freeagent hooked up to a firewire port or to a usb port?

It sounds like the freeagent was beeing treated like a usb 1 drive, in which case your speed wasn't so bad -- althoguhyou would then have the prob of why the freeagent is being treated as uysb 1.

Mon, 06/21/2010 - 19:06
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Have you tested the transfer rate of your PC using something other than Acronis? I've never seen USB2 transfer at anything close to its claimed rate of 480MB/sec. In real life I see transfers of around 25MB/sec (1.5GB/min) using USB2 with Acronis, ShadowProtect, SD cards from cameras, or whatever. The best performance I get is 36MB/sec (2.1GB/sec) transferring from my internal SSD to a USB2 external drive.

I would expect to see similar disparities with FireWire and eSATA. I don't know what causes the slowdown. Hardware? OS? Antivirus? I/O bottlenecks? Acronis might limit your speed a little, especially if you are doing compression, but compare it to some other type of transfer on the same hardware before you conclude that it's a 100% software problem.

EDIT: Oops. Looks like Scott beat me too it, and with a better reply too.

Mon, 06/21/2010 - 19:10