[ltp] Re: Cloning a hard disk?

[Vijay Garla]

Hi,

I got an answer to my question, thought I would post it.  The problem 
is, these partitions were mounted as type subfs:
/dev/sda2 on /media/LINUX type subfs (rw,nosuid,nodev,sync,fs=ext3)
/dev/sda1 on /media/BACKUP1 type subfs 
(rw,nosuid,nodev,sync,fs=floppyfss,procuid)

Instead, they should be mounted directly:
mount -o "noatime,rw,nosuid,nodev" -t vfat /dev/sda1 /media/BACKUP1
mount -o "noatime,data=writeback" -t ext3 /dev/sda2 /media/LINUX

Now, write throughput is > 100MB/s

Cheers,

- vijay

Vijay Garla wrote:

> Hi,
>
> using external usb 2.0 drives, i've seen wildly varying data transfer 
> rates under linux (i've tried knoppix and suse). - Under windows, data 
> moves quite fast
> - Under linux, I see 1.6MB/s write speeds, and 23.6 MB/s reading 
> speeds (this is much lower than the throughput should be on a USB 2.0 
> drive).
>
> writing speed = 1.6 MB/s
>
> dd if=/dev/zero of=/media/BACKUP1/test.out bs=1024 count=10240
> 10240+0 records in
> 10240+0 records out
> 10485760 bytes (10 MB) copied, 6.56667 seconds, 1.6 MB/s
>
> reading speed = 23.6 MB/s
>
> dd if=/media/BACKUP1/test.out of=/dev/null
> 20480+0 records in
> 20480+0 records out
> 10485760 bytes (10 MB) copied, 0.444978 seconds, 23.6 MB/s
>
>
> How do I speed things up?  This is a cheap, no-name usb enclosure, 
> with a high-speed drive in it.
> TIA
>
> - vijay
>
> honey@gneek.com wrote:
>
>> On Fri, 19 Aug 2005, Jaime Iniesta wrote:
>>
>>> It looks like my test didn't work. After 11 hours I aborted the 
>>> process:
>>>
>>> root@0[dev]# dd if=/dev/hda of=/dev/uba bs=10M
>>> 1895+0 records in
>>> 1895+0 records out
>>> 19870515200 bytes transferred in 40062.003484 seconds (495994 
>>> bytes/sec)
>>>
>>> Jaime
>>
>>
>>
>> Jaime - that looks like not even 0.5MB/s, so you've got a USB1 device
>> there, or your system's not recognising a USB2 device correctly.  At
>> that rate an 60GB disk might take... two days?  As per my previous
>> mail, if you really have USB1, it's really not a good route - get a
>> drive caddy?
>>
>> Honey
>
>
>
>