DDrescue - Optimum Settings

 
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Old 01-08-2010
DDrescue - Optimum Settings

Hi all,
Just a quick one really; cloning one healthy drive to another healthy drive using ddrescue (was using dd but wanted progress report, have tried various methods but they clash with a nested if statement- long story!)
one drive is 40GB connected internally via IDE, other is 160GB connected via USB to IDE converter cable, not fussed about loosing the extra space on the new drive, just want an exact replica including partition table etc.

so far i tried;
ddrescue -v /dev/hda /dev/sda

which was slow as hell; am now retrying with;
ddrescue -v /dev/hda /dev/sda logfile.log

which i'm yet to see; but what i wanted to know is would i gain any imrovement from playing with the blocksize or clustersize options? And if so, what would be the recommended figures? (both drives are Linux formatted if that helps). Are there any other settings i should know about?

Thanks in advance,
Darren.
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volcheck(1)							   User Commands						       volcheck(1)

NAME
volcheck - checks for media in a drive and by default checks all floppy media SYNOPSIS
volcheck [-v] [-i secs] [-t secs] pathname DESCRIPTION
The volcheck utility tells Volume Management to look at each dev/pathname in sequence and determine if new media has been inserted in the drive. The default action is to volcheck all checkable media managed by volume management. OPTIONS
The following options are supported: -i secs Set the frequency of device checking to secs seconds. The default is 2 seconds. The minimum frequency is 1 second. -t secs Check the named device(s) for the next secs seconds. The maximum number of seconds allowed is 28800, which is 8 hours. The fre- quency of checking is specified by -i. There is no default total time. -v Verbose. OPERANDS
The following operands are supported: pathname The path name of a media device. EXAMPLES
Example 1: A sample of the volcheck command. The following example example% volcheck -v /dev/diskette /dev/diskette has media asks Volume Management to examine the floppy drive for new media. The following example example% volcheck -i 2 -t 600 /dev/diskette1 & asks Volume Management if there is a floppy in the floppy drive every 2 seconds for 600 seconds (10 minutes). FILES
/dev/volctl Volume Management control port ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWvolu | +-----------------------------+-----------------------------+ SEE ALSO
eject(1), volcancel(1), volmissing(1) rmmount(1M), vold(1M), rmmount.conf(4), vold.conf(4), attributes(5), volfs(7FS) WARNINGS
Due to a hardware limitation in many floppy drives, the act of checking for media causes mechanical action in the floppy drive. Continu- ous polling of the floppy drive will cause the drive to wear out. It is recommended that polling the drive only be performed during periods of high use. SunOS 5.10 21 Feb 1997 volcheck(1)