All based on data types and compression, so if you have a SQL DB backup you'll be able to compress more data on a tape than Windows bianries or image type files.
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Botelho, Tiago (External) Sent: Wednesday, January 18, 2012 9:27 AM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] LTO4 Tape Volumes with diferent Estimated Capacity Hello I have several tape volumes (LTO4) with different Estimated Capacity. What can cause this situation? Ex: A00035L4 WIN_SRV_T TS3310 629.5 G 95.4 Full A00039L4 WIN_SRV_T TS3310 1.1 T 98.2 Full A00101L4 WIN_SRV_T TS3310 884.8 G 84.4 Full A00113L4 WIN_SRV_T TS3310 1.0 T 93.7 Full A00118L4 WIN_SRV_T TS3310 1.0 T 73.6 Full A00128L4 WIN_SRV_T TS3310 1.0 T 99.2 Full A00129L4 WIN_SRV_T TS3310 969.1 G 93.7 Full A00133L4 WIN_SRV_T TS3310 934.8 G 96.1 Full All tapes and Drives are LTO4, TSM Server 553 for AIX. The devc are configured as: Device Class Name: TS3310 Device Access Strategy: Sequential Storage Pool Count: 16 Device Type: LTO Format: ULTRIUM4C Est/Max Capacity (MB): Mount Limit: DRIVES Mount Wait (min): 60 Mount Retention (min): 60 Label Prefix: ADSM Library: TS3310 Directory: Server Name: Retry Period: Retry Interval: Shared: High-level Address: Minimum Capacity: WORM: No Drive Encryption: Off Scaled Capacity: Last Update by (administrator): ADM Last Update Date/Time: 07/27/09 17:32:05 Cumprimentos / Best regards Tiago Botelho This e-mail, including attachments, may include confidential and/or proprietary information, and may be used only by the person or entity to which it is addressed. If the reader of this e-mail is not the intended recipient or his or her authorized agent, the reader is hereby notified that any dissemination, distribution or copying of this e-mail is prohibited. If you have received this e-mail in error, please notify the sender by replying to this message and delete this e-mail immediately.