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Old 12-04-2006, 02:08 AM
Wall Wall is offline
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Backup (very) slow on iBook G4

Hello.

I have been trying to clone my iBook G4 (1.42 GHz, 512 MB)'s hard drive to my new FW 400 external drive, yet have had to give up because it was taking much longer than expected. I had heard of copying rates of 1 GB per minute, but the copying rate on my computer was only about 0.80 MB/s...
The FireWire transfer rate clearly is not to blame : copying a 500 MB file to the external HD via the Finder only takes a few seconds, as it should.
SD itself does not seem to be the culprit either : I attempted Restoration to my external HD via Disk Utility, with about the same (non-)result...

My questions are :
- Is this copying rate normal given my configuration (a bit outdated, I suppose...) ?
- If not, what can I do to improve it ? Does it have anything to do with the external HD being journaled ?

Thank you in advance for any help.
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Old 12-04-2006, 07:30 AM
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dnanian dnanian is offline
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Anything other than the FW drive attached to FireWire? What specific brand/model of drive is it?
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Old 12-04-2006, 08:24 AM
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Thanks for your answer.
No, nothing else is attached to the FW port.
My external HD is a 250 GB LaCie d2 with triple interface.
When copying via the Finder, the transfer rate seems to be OK (a few seconds for a 450 MB iDVD project for example). I only seem to have this slowness problem when backing up my entire HD, whether via SuperDuper or Disk Utility.
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Old 12-04-2006, 09:03 AM
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There's certainly a big difference between copying a single very large file (like an iDVD project) and hundreds of thousands of small ones, so it's hard to generalize from Finder's behavior.

So, the overall speed at the end of the copy operation is less than 1MB/s?
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Old 12-04-2006, 09:18 AM
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Quote:
Originally Posted by dnanian View Post
There's certainly a big difference between copying a single very large file (like an iDVD project) and hundreds of thousands of small ones, so it's hard to generalize from Finder's behavior.
I would have thought so.

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Originally Posted by dnanian View Post
So, the overall speed at the end of the copy operation is less than 1MB/s?
I made a first clone with the LaCie software included in the device's CD-ROM, and it took most of the night to end up with a buggy clone (no user settings even after permissions were repaired...), which is why I decided to have a go at the widely acclaimed SuperDuper. Unfortunately, when I tried it, I did not have time to wait until the process was finished (had to use the iBook for work), so I stopped it after about 10 minutes, assuming it was going to take as long anyway. My mistake, undoubtedly.
I'll run it tonight in its entirety and post back with the average copying rate.

P.S.: Could the relative slowness of the processor be responsible? It's only a 1.42 GHz G4, but is not 100% active when backing up (according to MenuMeters).
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Config.: 14" G4 iBook, 1.42 GHz, 512 MB (Sept '05) + 250 GB LaCie d2 via FW 400.
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Old 12-04-2006, 09:19 AM
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In general, a large copying operation is not CPU-bound, it's I/O bound, and is more affected by the speed of that subsystem. If you're running any kind of low-level tool like AntiVirus, though, that'll affect things very severely.
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