No misunderstanding at all. I know how it works. I see upwards of 100GB on some of my K tapes but "NO LESS" than 40GB on any of the others.
All I did was "move" 20 servers what were getting the full 40GB compression or better on a 3590 tape system to a LTO system. The data is the same, the servers just moved. To me compression looks like it is not working. Thanks, Geoff Gill TSM Administrator PeopleSoft Sr. Systems Administrator SAIC M/S-G1b (858)826-4062 Email: [EMAIL PROTECTED] -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Mark Stapleton Sent: Thursday, April 20, 2006 11:34 AM To: ADSM-L@VM.MARIST.EDU Subject: Re: tape capacity "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> wrote on 04/20/2006 01:18:14 PM: > The way the LTO2 drives seem to be working is that although the compressions > settings within TSM are the same, and the servers were just migrated from > one server to the other, if the tape were listed 20/40 it is only storing 20 > instead of 40GB. That is not what the 3590 is doing. I would have expected > to see this same data on a tape listed at 200/400GB closer to the 400GB > compressed value and not the 200GB value. > > So I think the question still remains how to reach that upper limit instead > of the lower? Is there a TSM setting I have missed? Is there a drive setting > that needs adjusting on the drive itself? You missed the point of what Richard was saying. The amount of compression a particular tape gets is entirely dependent upon the data you're backing up. If it's easily compressable (text files, relatively empty database files, and such), you'll get much closer to 400GB (you may even get more), while if it's *not* compressable (full database files, binaries, and such), you'll get closer to 200GB. I have had LTO tapes that fill at 95% of the uncompressed size, and others that have filled at 125% of the compressed rating. There is no TSM setting that will affect the compressability of client data. -- Mark Stapleton ([EMAIL PROTECTED]) US Bank MR Backup and Recovery Management Office 262.790.3190 ---------------------------------------------------------------------------- -- Electronic Privacy Notice. This e-mail, and any attachments, contains information that is, or may be, covered by electronic communications privacy laws, and is also confidential and proprietary in nature. If you are not the intended recipient, please be advised that you are legally prohibited from retaining, using, copying, distributing, or otherwise disclosing this information in any manner. Instead, please reply to the sender that you have received this communication in error, and then immediately delete it. Thank you in advance for your cooperation. ============================================================================ ==