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Full Discussion: DD copy excluding empty blocks?
Special Forums Hardware Filesystems, Disks and Memory DD copy excluding empty blocks? Post 302265229 by Merkilo on Saturday 6th of December 2008 04:15:16 AM
Old 12-06-2008
DD copy excluding empty blocks?
I'm not 100% sure if this was the right place to post in but here i go:

I'm attempting to migrate a physical windows disk onto my SAN through the use of the dd copy command. I'm booting into knoppix, running dd, and then bringing the server back up into windows running on the SAN. Everything boots just fine, but what I realized is the dd command is copying the empty blocks on the disk. Not only is this greatly extending the time of the copy, but I'm losing my thin provisioning, which is a key benefit of having the SAN. I'd really like to make this a working solution so my question is: Is there any way to do a dd copy without copying the empty blocks on the drive?

Oh and resizing the partition before the copy is not an option
 

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LEARN ABOUT OPENSOLARIS

volcopy_ufs

volcopy_ufs(1M) 					  System Administration Commands					   volcopy_ufs(1M)

NAME

       volcopy_ufs - make an image copy of a ufs file system

SYNOPSIS

       volcopy [-F ufs] [generic_options] fsname srcdevice volname1 destdevice volname2

DESCRIPTION

       volcopy makes a literal copy of the ufs file system using a blocksize matched to the device.

OPTIONS

       The following option is supported:

       generic_options	  options supported by the generic  volcopy command. See  volcopy(1M).

OPERANDS

       The following operands are supported:

       fsname			  represents the mount point (for example, root, u1, etc.) of the file system being copied.

       srcdevice or destdevice	  the disk partition specified using the raw device (for example, /dev/rdsk/cld0s8, /dev/rdsk/cld1s8, etc.).

       srcdevice and volname1	  the device and physical volume from which the copy of the file system is being extracted.

       destdevice and volname2	  the target device and physical volume.

       fsname  and  volname  are  limited to six or fewer characters and recorded in the superblock. volname may be `-' to use the existing volume
       name.

EXIT STATUS

       The following exit values are returned:

       0	   Successful file system copy.

       non-zero    An error has occurred.

FILES

       /var/adm/filesave.log	a record of file systems/volumes copied

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cpio(1), dd(1M), labelit(1M), volcopy(1M), attributes(5), ufs(7FS)

NOTES

       volcopy does not support copying to tape devices. Use dd(1M) for copying to and from tape devices.

SunOS 5.11							    15 Apr 2003 						   volcopy_ufs(1M)
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