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rav
Tux's lil' helper
Joined: 24 Nov 2003
Posts: 114
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 Posted: Tue Dec 18, 2007 11:35 am Post subject: Sata Configuration? |
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I just installed a new seagate sata drive, and did a quick test using "hdparm -tT". (not sure how accurate that is on a sata drive).
ST380011A
| Code: | /dev/hda:
Timing cached reads: 912 MB in 2.00 seconds = 455.92 MB/sec
Timing buffered disk reads: 166 MB in 3.01 seconds = 55.18 MB/sec |
ST3500320AS
| Code: | /dev/sda:
Timing cached reads: 908 MB in 2.00 seconds = 453.48 MB/sec
Timing buffered disk reads: 286 MB in 3.01 seconds = 94.95 MB/sec |
At a guess, I'd say the sata drive isn't configured properly. How can I varify that the drive is running properly?
("sdparm -i" was grosly unenlightening.) |
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gentoo_ram
Guru
Joined: 25 Oct 2007
Posts: 513
Location: San Diego, California USA
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| Posted: Tue Dec 18, 2007 7:35 pm Post subject: |
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| What's the problem? The SATA drive is almost twice as fast as the IDE drive. "Cached reads" means reading out of your computer's memory. That's going to be approximately constant regardless of which drive you use. It depends on your CPU and RAM subsystems. The important number for disk performance is the "buffered disk reads". |
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rav
Tux's lil' helper
Joined: 24 Nov 2003
Posts: 114
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| Posted: Tue Dec 18, 2007 11:14 pm Post subject: |
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Arr.. Cache != Disc Cache, I suppose I should have actually read the documentation of that test first.
The sata drive should in fact be faster then that, but afaik its running on UDMA100 is opposed to UDMA133.
How can I prove that the HD cache is being detected/used correctly? And, what, if any, are the issues with SiI 3112 SATA and UDMA133? |
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Kernel & Hardware
