SATA problems
Rohan Kulkarni
rohan.ak1 at gmail.com
Wed Jul 4 05:13:27 UTC 2007
Hello,
So will it help if I have a faster processor or I add in more RAM
to my system?
On 7/3/07, John Wendel <john.wendel at metnet.navy.mil> wrote:
>
> Rohan Kulkarni wrote:
> >
> >
> > On 7/3/07, *Rohan Kulkarni* <rohan.ak1 at gmail.com
> > <mailto:rohan.ak1 at gmail.com>> wrote:
> >
> >
> >
> > On 7/2/07, *John Wendel* < john.wendel at metnet.navy.mil
> > <mailto:john.wendel at metnet.navy.mil>> wrote:
> >
> > Rohan Kulkarni wrote:
> > >
> > >
> > > On 7/2/07, *Tim* <ignored_mailbox at yahoo.com.au
> > <mailto:ignored_mailbox at yahoo.com.au>
> > > <mailto:ignored_mailbox at yahoo.com.au
> > <mailto:ignored_mailbox at yahoo.com.au>>> wrote:
> > >
> > > On Mon, 2007-07-02 at 19:14 +0530, Rohan Kulkarni wrote:
> > > > My motherboard supports hard disk speed of 150MB/s but
> i
> > get only
> > > > 15MB/s speed
> > >
> > > Have you double-checked that the figures you're reading at
> > are bits per
> > > second or bytes per second?
> > >
> > > --
> > > (This box runs FC5, my others run FC4 & FC6, in case
> that's
> > > important to the thread.)
> > >
> > > Don't send private replies to my address, the mailbox is
> > ignored.
> > > I read messages from the public lists.
> > >
> > >
> > >
> > > Hello,
> > > Yes I have checked with the motherboard
> > specifications.It
> > > says that it supports
> > > a speed of 150MB/s.It is bytes for second.Though my
> > hard disk
> > > supports native command queing my motherboard does not
> support
> > it.
> > >
> > > --
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> > <mailto: fedora-list at redhat.com <mailto:fedora-list at redhat.com>>
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> > > < https://www.redhat.com/mailman/listinfo/fedora-list>
> > >
> > >
> >
> > It doesn't matter what speed your motherboard (SATA controller)
> > supports if the disk speed is slower. What brand/model of disk
> > do you
> > have? What kernel version? How are you measuring the disk speed?
> >
> > Regards,
> >
> > John
> >
> >
> >
> > Hello,
> > I have a Seagate ST3160211AS.It is a Barracuda 160GB hard
> > disk with a
> > speed of 7200RPM.It supports upto 300MB/s with Native
> > Command Queing.I checked the average speed of copying by copying a
> > 3GB file from one FAT32 partition to another.I got a
> > average speed of around
> > 15MB/s.I have the kernel 2.6.21-1.3228.fc7
> > Thanks...
> >
> >
> >
> > Can anyone please help me...do i need to update to the latest
> > kernel??or do i need
> > to download some drivers.
> >
> > --
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> >
> >
> >
>
> You don't really have a problem!
>
> Don't confuse the maximum interface transfer speed (150 MB/s) with
> your disk transfer speed (approx 40-50 MB/s).
>
> When you copy a file, you read the old file, and then you write the
> new file, rinse and repeat until done. So your transfer speed is going
> to be approximately 1/2 to disk speed. And now you need to add in the
> operating system overhead, allocating blocks for the new file, and all
> the seek time, moving the disk heads between the old file blocks and
> the new file blocks.
>
> 15 MB/s seems reasonable. On my box, using a single drive, I get a
> write speed of 30 MB/s for a 3 GB file and a copy speed of 14 MB/s.
>
> Need more speed, get more disks and a raid controller.
>
> Regards,
>
> John
>
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