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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 HPUX

norewind_close_disabled

norewind_close_disabled(5)					File Formats Manual					norewind_close_disabled(5)

NAME

       norewind_close_disabled - determine whether access to tape device special files without the no-rewind-on-close option is allowed

VALUES

   Default
   Allowed values
DESCRIPTION

       Note: this tunable was named in releases prior to HP-UX 11i v3.

       This  tunable  notifies the tape driver whether it should allow access to device special files without the no-rewind-on-close option.  When
       this tunable is on, the tape driver will fail any open on a tape device special file that does not have the no-rewind-on-close option (that
       is, or with a status of

       The  tunable  allows  the  safe	sharing of tape devices in SAN tape backup solution configurations.  The disabling of device special files
       without no-rewind-on-close in a SAN tape backup solution configuration prevents the accidental sending of a rewind command  on  close  from
       HP-UX systems via standard tape commands like which would corrupt a backup in process.

   Who Is Expected to Change This Tunable?
       Anyone.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Tunable Be Turned On?
       This tunable should be turned on if the system is going to be used in a SAN tape backup solution configuration.

   What Are the Side Effects of Turning the Tunable On?
       The  tape  driver  will	fail any open to a tape device special file that does not have the no-rewind-on-close option with a status of This
       behavior prevents the usage of any tape device special file without the no-rewind-on-close option.

   When Should the Tunable Be Turned Off?
       This tunable should be turned off if the system is not part of a SAN tape backup solution configuration or the  system  utilizes  will  not
       function unless it has access to device special files without the no-rewind-on-close option.

   What Are the Side Effects of Turning the Tunable Off?
       A rewind may be issued accidentally from this system on close, possibly corrupting a backup being issued from another system on the SAN.

   What Other Tunables Should Be Changed at the Same Time?
       None.

EXAMPLES

       Query the current value of the tunable:

       Set the value of the tunable to

       To save the value of the tunable across reboots:

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by Hewlett-Packard.

SEE ALSO

       scsi_tape(7), scsimgr_estape(7).

							     Tunable Kernel Parameters					norewind_close_disabled(5)
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