duplicating level0 archive tape

I need to duplicate a level 0 archive tape for an INFORMIX database. I have two tape drives. What is the best method? HPUX11.0 INFORMIX-OnLine Version 7.23.UC11 I currently use ontape in a backup program to make the tape, and it takes several hours. I want to return to production and then use the two tape drives to duplicate it via a UNIX command. Any ideas? For that matter, I want to do the same thing for our IGNITE tape. How about that? I tried the dd command: dd if=/dev/rmt/0m of=/dev/rmt/1m echo "$?" I got a 0 return status, indicating a good copy, but the IGNITE verification had massive discrepancies. Thanks. Rob

Block size. When you copy tapes you have to make certain that the physical blocking of the tape is identical between the source and destination. So, if you have TAPEBLOCK set to 256k then: dd bs=256k if=/dev/rmt/0m of=/dev/rmt/1m Art S. Kagel ----- Original Message ----- From: R.... Konikoff <ids@iiug.org> At: 5/04 17:13:50 I need to duplicate a level 0 archive tape for an INFORMIX database. I have two tape drives. What is the best method? HPUX11.0 INFORMIX-OnLine Version 7.23.UC11 I currently use ontape in a backup program to make the tape, and it takes several hours. I want to return to production and then use the two tape drives to duplicate it via a UNIX command. Any ideas? For that matter, I want to do the same thing for our IGNITE tape. How about that? I tried the dd command: dd if=/dev/rmt/0m of=/dev/rmt/1m echo "$?" I got a 0 return status, indicating a good copy, but the IGNITE verification had massive discrepancies. Thanks. Rob ******************************************************************************* Forum Note: Use "Reply" to post a response in the discussion forum.

Rob You may need to set the block size in the dd for both input (ibs=) and output (obs=). How big do you expect the archive to be and was that volume copied from 1 tape to the other? More importantly, can you restore from the second tape? Don't think anything else matters. MW -----Original Message----- From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Konikoff, R.... Sent: Friday, 5 May 2006 9:11 a.m. To: ids@iiug.org Subject: duplicating level0 archive tape [6660] I need to duplicate a level 0 archive tape for an INFORMIX database. I have two tape drives. What is the best method? HPUX11.0 INFORMIX-OnLine Version 7.23.UC11 I currently use ontape in a backup program to make the tape, and it takes several hours. I want to return to production and then use the two tape drives to duplicate it via a UNIX command. Any ideas? For that matter, I want to do the same thing for our IGNITE tape. How about that? I tried the dd command: dd if=/dev/rmt/0m of=/dev/rmt/1m echo "$?" I got a 0 return status, indicating a good copy, but the IGNITE verification had massive discrepancies. Thanks. Rob **************************************************************************** *** Forum Note: Use "Reply" to post a response in the discussion forum.

Thank you, Mr. Kagel. I'll give that a shot! My onconfig shows: LTAPEBLK 2048 # Log tape block size (Kbytes DDS-3 DAT) LTAPESIZE 24000000 # Max amount of data to put on log tape (Kbytes DDS-3 DAT) So I would use: dd bs=2048kb if=/dev/rmt/0m of=/dev/rmt/1m ? Rob -----Original Message----- From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of ART KAGEL, .... Sent: Thursday, May 04, 2006 5:16 PM To: ids@iiug.org Subject: Re: duplicating level0 archive tape [6662] Block size. When you copy tapes you have to make certain that the physical blocking of the tape is identical between the source and destination. So, if you have TAPEBLOCK set to 256k then: dd bs=256k if=/dev/rmt/0m of=/dev/rmt/1m Art S. Kagel ----- Original Message ----- From: R.... Konikoff <ids@iiug.org> At: 5/04 17:13:50 I need to duplicate a level 0 archive tape for an INFORMIX database. I have two tape drives. What is the best method? HPUX11.0 INFORMIX-OnLine Version 7.23.UC11 I currently use ontape in a backup program to make the tape, and it takes several hours. I want to return to production and then use the two tape drives to duplicate it via a UNIX command. Any ideas? For that matter, I want to do the same thing for our IGNITE tape. How about that? I tried the dd command: dd if=/dev/rmt/0m of=/dev/rmt/1m echo "$?" I got a 0 return status, indicating a good copy, but the IGNITE verification had massive discrepancies. Thanks. Rob ************************************************************************ ******* Forum Note: Use "Reply" to post a response in the discussion forum. ************************************************************************ ******* Forum Note: Use "Reply" to post a response in the discussion forum.

Yup. -- Art ----- Original Message ----- From: R.... Konikoff <ids@iiug.org> At: 5/04 17:51:08 Thank you, Mr. Kagel. I'll give that a shot! My onconfig shows: LTAPEBLK 2048 # Log tape block size (Kbytes DDS-3 DAT) LTAPESIZE 24000000 # Max amount of data to put on log tape (Kbytes DDS-3 DAT) So I would use: dd bs=2048kb if=/dev/rmt/0m of=/dev/rmt/1m ? Rob -----Original Message----- From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of ART KAGEL, .... Sent: Thursday, May 04, 2006 5:16 PM To: ids@iiug.org Subject: Re: duplicating level0 archive tape [6662] Block size. When you copy tapes you have to make certain that the physical blocking of the tape is identical between the source and destination. So, if you have TAPEBLOCK set to 256k then: dd bs=256k if=/dev/rmt/0m of=/dev/rmt/1m Art S. Kagel ----- Original Message ----- From: R.... Konikoff <ids@iiug.org> At: 5/04 17:13:50 I need to duplicate a level 0 archive tape for an INFORMIX database. I have two tape drives. What is the best method? HPUX11.0 INFORMIX-OnLine Version 7.23.UC11 I currently use ontape in a backup program to make the tape, and it takes several hours. I want to return to production and then use the two tape drives to duplicate it via a UNIX command. Any ideas? For that matter, I want to do the same thing for our IGNITE tape. How about that? I tried the dd command: dd if=/dev/rmt/0m of=/dev/rmt/1m echo "$?" I got a 0 return status, indicating a good copy, but the IGNITE verification had massive discrepancies. Thanks. Rob ************************************************************************ ******* Forum Note: Use "Reply" to post a response in the discussion forum. ************************************************************************ ******* Forum Note: Use "Reply" to post a response in the discussion forum. ******************************************************************************* Forum Note: Use "Reply" to post a response in the discussion forum.