Rohan Kulkarni wrote:
On 7/3/07, *Rohan Kulkarni* <rohan.ak1@xxxxxxxxx
<mailto:rohan.ak1@xxxxxxxxx>> wrote:
On 7/2/07, *John Wendel* < john.wendel@xxxxxxxxxxxxxxx
<mailto:john.wendel@xxxxxxxxxxxxxxx>> wrote:
Rohan Kulkarni wrote:
>
>
> On 7/2/07, *Tim* <ignored_mailbox@xxxxxxxxxxxx
<mailto:ignored_mailbox@xxxxxxxxxxxx>
> <mailto:ignored_mailbox@xxxxxxxxxxxx
<mailto:ignored_mailbox@xxxxxxxxxxxx>>> 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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>
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
