SATA problems
Jeffrey Ross
jeff at bubble.org
Tue Jul 3 17:48:01 UTC 2007
John Wendel 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>>
>> > To unsubscribe:
>> https://www.redhat.com/mailman/listinfo/fedora-list
>> > < 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.
>>
>> --
>> fedora-list mailing list
>> fedora-list at redhat.com <mailto:fedora-list at redhat.com>
>> To unsubscribe:
>> https://www.redhat.com/mailman/listinfo/fedora-list
>> <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
>
>
Don't forget on the Seagate drives to remove the little jumper to enable
the SATA interface at 3.0Gb/s (assuming your motherboard can support it)
since Seagate's default setting is with the jumper installed.
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
Jeff
More information about the fedora-list
mailing list