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.
> >         >
> >         >     --
> >         >     fedora-list mailing list
> >         >     fedora-list at redhat.com <mailto:fedora-list at redhat.com>
> >         <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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> >         <https://www.redhat.com/mailman/listinfo/fedora-list>
> >
> >
> >
>
> 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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