Sorry, I just noticed now the one data set is encrypted and the other is not. Quite a noticeable difference
-----Original Message----- From: Justin Piszcz [mailto:jpis...@lucidpixels.com] Sent: 02 March 2010 14:49 To: Shekel Tal Cc: Kevin C; veritas-bu@mailman.eng.auburn.edu Subject: RE: [Veritas-bu] Sun/StorageTek based LTO4 encryption On Tue, 2 Mar 2010, Shekel Tal wrote: > I have also been looking at this as an option. > One of the considerations is the effect encryption has on compression. > > I have heard you loose the ability to compress effectively when using > compression. > > Have you noticed an effect on your tape drive compression when using > tape drive based encryption? Yes. LTO-4 TAPE = 800GB IBM LTO-4 ENCRYPTED (RATIO = ~1.5:1) ABCD25 3 67 02/17/2010 20:00 02/23/2010 00:00 hcart 1188618163 0 MPX 03/26/2010 00:00 N/A FULL ENCRYPTION ABCD36 3 101 02/18/2010 00:12 03/02/2010 00:00 hcart 1239789810 0 MPX 04/02/2010 00:00 N/A FULL ENCRYPTION IBM LTO-4 NO ENCRYPTION (RATIO = ~3.1:1) ABCD49 2 1144 02/23/2010 02:43 02/26/2010 01:32 hcart 2451541654 0 MPX 03/19/2010 02:49 N/A FULL ABCD50 2 1350 02/26/2010 01:32 03/01/2010 01:05 hcart 2377975447 0 MPX 03/22/2010 02:05 N/A FULL ABCD51 2 1275 02/24/2010 20:01 02/27/2010 10:40 hcart 2575741349 0 MPX 03/20/2010 11:40 N/A FULL Justin. _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu