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#1 2008-06-06 11:04:10
- QuimaxW
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SATA 3.0 transfer speeds
I haven't been able to find a (seemingly) simple piece of information.
How quickly (in MB/s) should I be able to copy files from one SATA 3.0 drive to another SATA 3.0 drive in my system?
Using rsync -a --progress with a big file I've been peaking at about 55-60MB/s. I just don't know if that's good or not. It bothers me though that while I'm copying the file the cpu hits 90% used though.
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#2 2008-06-06 14:24:34
- .:B:.
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Re: SATA 3.0 transfer speeds
While the first generation of S-ATA suported up to 1.5 Gbps transfer speeds, the drives they power often do not 
. Nowadays they do up to 3 Gbps if I'm not mistaken, but I do not think there is any drive on the market that manages to fill that bandwidth. Your speeds are just fine for a desktop HD.
Edit: thanks for the correction zenlord.
Last edited by B (2008-06-06 16:03:20)
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#3 2008-06-06 15:29:45
- zenlord
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Re: SATA 3.0 transfer speeds
Some corrections IIRC:
1. I've never heard of SATA 3.0 (except the announcements of what is to come) so I guess you mean SATA2 (which is the common name for SATA/3Gb)
2. SATA2 offers speeds up to 3 Gb/s
3. A single HD can do slightly better than 60MB/s, but you'll only get to the maximum of the SATA-bus upon connecting a RAID-array of more than 5 disks on 1 SATA-bus.
Zl.
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#4 2008-06-06 15:31:27
- sirocco
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Re: SATA 3.0 transfer speeds
... while I'm copying the file the cpu hits 90% used though.
Depends on FS.
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#5 2008-06-06 18:29:55
- QuimaxW
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Re: SATA 3.0 transfer speeds
QuimaxW wrote:... while I'm copying the file the cpu hits 90% used though.
Depends on FS.
My RAID 5 is formatted with XFS, and the backup drive is ext3. Is one of these supposed to be better than the other in terms of CPU usage?
If everything backs up fine, I may reformat the RAID 5 as ext3 and see if there is a change or not.
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