Greg Freemyer wrote:
On Mon, Feb 7, 2011 at 10:26 AM, Per Jessen
wrote: Greg Freemyer wrote:
Or trust you know what you're doing and ignore parted's optimum alignment. I seriously doubt it will have any impact on your performance with that drive.
At first I tried the 1Mb alignment with an elderly 40Gb Hitachi - made no difference. I was surprised to see up to an extra 2.5Mb/s on the WD 3Tb drive. I'll be trying the same thing with a WD Caviar Black.
Per,
Were your performance tests at the same sectors for two different tests?
Yes, apart from re-aligning the partition to start on a multiple of 2048. For performance testing, I had tried to put a partition at "the end of the drive", which is when parted complained about the location not being optimum. I adjusted the starting sector down, that's all.
I ask because modern drives have constant RPM but more or less constant linear density, so when working with sectors on the outer edge of the platter more data is incorporated per revolution. Thus you get higher read/write speeds on the outer edge of the platter.
Yes, there is quite a difference. On the WD 3Tb from 120Mb/s (outer) to 56Mb/s (inner). -- Per Jessen, Zürich (6.2°C) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org