In message <[EMAIL PROTECTED]> you wrote: > > Anyway, in typical scenarios, the only reliable way way of guessing tape > capacity (or remaining capacity) is estimating based on individual data, > i.e. using existing tapes with similar data on them as reference.
I wouldn't call this a "reliable" way. Here is a list of 40 full SLR100 tapes (uncompressed capacity 50 GB) in my data base: 77.26 GB 50.97 GB 74.15 GB 63.02 GB 84.49 GB 79.71 GB 74.27 GB 50.18 GB 81.88 GB 66.97 GB 53.13 GB 79.62 GB 70.37 GB 62.32 GB 60.45 GB 68.09 GB 90.81 GB 67.41 GB 58.63 GB 68.90 GB 69.35 GB 78.18 GB 82.05 GB 59.76 GB 55.89 GB 70.25 GB 81.49 GB 59.50 GB 83.72 GB 66.82 GB 76.24 GB 77.66 GB 78.55 GB 82.05 GB 69.37 GB 66.80 GB 67.31 GB 74.38 GB 46.41 GB 58.85 GB They were written with h/w compression turned on; as you can see the range is 46.4 ... 90.8 GB; the average is 69.7 GB. So what should we guestimate as "remaining free capacity" after writing for example 40 GB of data? 6 GB? 29 GB? 50 GB? Depending on previous tape use, current file system content, backup schedules I don't know in advance which file system will end on which tape, so even if I know the likely compression rate for a specific file syste, I would not be able to put this information to use. Best regards, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: [EMAIL PROTECTED] "What the scientists have in their briefcases is terrifying." - Nikita Khrushchev ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
