Author: Robert Hyatt
Date: 10:02:29 02/01/05
Go up one level in this thread
On February 01, 2005 at 11:10:44, Vincent Diepeveen wrote: >On February 01, 2005 at 01:04:25, Robert Hyatt wrote: > >In most big business enterprises they use DAT of course already for a long >period of time. It's far superior in recording quality. All problems you >describe i only see with DVD or CD. > >Never have problems with DAT. > >Certain Important databases where we are using DAT for are pretty crucial for >society. > >At least 70 years such DAT's keep existing. Most selfwritten CDROMS are gone >after a year. > >Not a single problem with DAT here. > >The only possible problem DAT has is that it doesn't store so much like a >harddisk can do nowadays. It didn't keep up with harddisks. There are others. 1. tape is supposed to remain flexible. It doesn't over time. 2. the oxide coating is supposed to remain flexible and adhered to the tape media. It doesn't over time. 3. Any magnetic media loses strength over time. 4. I have CDs written with the first CD writer we had here. They still work just fine. I have some 2-3 year old DVDS that read just fine. I don't consider any media "permanent". It pays to diversify. > >>On January 31, 2005 at 13:55:53, Vincent Diepeveen wrote: >> >>>On January 31, 2005 at 13:32:25, Robert Hyatt wrote: >>> >>>>On January 30, 2005 at 23:38:08, Eugene Nalimov wrote: >>>> >>>>>On January 30, 2005 at 22:39:46, Robert Hyatt wrote: >>>>> >>>>>>On January 30, 2005 at 19:42:28, Ingo Bauer wrote: >>>>>> >>>>>>>Hello >>>>>>> >>>>>>>Is anybody able to tell me if the 6 man tablebases without pawns are complete, >>>>>>>how many there are of them and what is the size of all of them? >>>>>>> >>>>>>>Thx in advance >>>>>>>Ingo >>>>>> >>>>>> >>>>>>They are done, except for 5 vs 1, but I don't know the size since they are not >>>>>>all currently available at my ftp site. >>>>> >>>>>My (wild) guess is that they are ~400-500Gb. I don't have disks attached to my >>>>>system right now. >>>>> >>>>>Bob, I believe there is mirror with all those TBs somewhere in Europe, you can >>>>>probably just download them. >>>>> >>>>>Thanks, >>>>>Eugene >>>> >>>> >>>>That is my intent once I am sure the RAID stuff is working. We now have a huge >>>>tape gadget that will be used to back things up, although my success with tape >>>>backups has not bee great... >>> >>>TAPES here have at most 1 small error each 8 GB or so which all get corrected >>>usual, if they aren't used too much yet. Usually first 25 usages TAPE is more >>>reliable than CD's or DVD's here. >> >>Problem is shelf-life. Record it today, use it next year, it might not be >>readable. Or when you record it today it might not be readable tomorrow. You >>can't afford to test it monthly as that causes wear and tear that can make it >>unreadable. This is how I lost everything a few years ago. We wrote tapes for >>9 months that could not be read when we started to attempt a recovery after a >>disk of mine crashed. >> >>I now back up all my personal stuff on DVD once or twice a month. On top of the >>backup done to tape which I will never trust again. This new gadget we use is a >>40 tape library that holds 1-2 terabytes per tape. I'm just suspicious it is a >>write-only device when things are critical. >> >>> >>>Note i had backupped all nalimov's EGTBs to supercomputer tape which is 100% >>>sureness it's on it yet, but i can't login to that machine since 1 januari 2004, >>>as the sysadmins used up my time (for which i was very angry) causing to have >>>used 93000 hours of system time whereas i had budget for only 90000. >> >>No tape is 100% reliable. >> >>> >>>I didn't feel like asking for another extension of that (which would cost me 500 >>>pages of a4 writing at least and 6 months). >>> >>>Anyway, my experiences with highend Tape are REAL good. >>> >>>Especially DAT tapes. Most reliable backup method ever. >>> >>>Vincent >> >>hardly. My files were backed up on DAT tape. Went right around the bowl and >>down the hole. We have seen other failures as well...
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