Re: DLT Backup Questions
On Tuesday, 22 October 2002 at 12:26:04 -0500, Dan Nelson wrote: > In the last episode (Oct 22), Chad Morland said: >> I am looking to create a multi-tape backup of close to 260G of data >> using a DLT-7000 with compression turned on. Does anyone have any >> recommendations for what to use to accomplish this? Amanda does not >> support multi-tape archives so that is out of the question. I have >> tried to use gnu tar but for some reason that was only placing 35G >> onto each tape (I am trying to use compression.) > > I have used gnutar to back up to multiple DLT tapes and it works fine. > Check the LEDs on the unit when you're doing a backup. If the "35" and > "Compress" LEDs are not lit, you might have tapes that had been written > with compression off at some point. Rewind the tape, and press the > "Density" button until "35", "Compress", and "Override" are all lit. > Then try the backup again. The compression also depends on the kind of data you're backing up. If it's all gzipped or JPEGs or some such precompressed data, you'll get hardly any additional compression. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
Re: DLT Backup Questions
In the last episode (Oct 22), Chad Morland said: > I am looking to create a multi-tape backup of close to 260G of data > using a DLT-7000 with compression turned on. Does anyone have any > recommendations for what to use to accomplish this? Amanda does not > support multi-tape archives so that is out of the question. I have > tried to use gnu tar but for some reason that was only placing 35G > onto each tape (I am trying to use compression.) I have used gnutar to back up to multiple DLT tapes and it works fine. Check the LEDs on the unit when you're doing a backup. If the "35" and "Compress" LEDs are not lit, you might have tapes that had been written with compression off at some point. Rewind the tape, and press the "Density" button until "35", "Compress", and "Override" are all lit. Then try the backup again. -- Dan Nelson [EMAIL PROTECTED] To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
Re: DLT Backup Questions
> > I am looking to create a multi-tape backup of close to 260G of data > using a DLT-7000 with compression turned on. Does anyone have any > recommendations for what to use to accomplish this? Amanda does not > support multi-tape archives so that is out of the question. I have tried > to use gnu tar but for some reason that was only placing 35G onto each > tape (I am trying to use compression.) If you realy mean you want a backup (not a copy to move to some other system or whatever) to cover yourself in case of a system or disk failure, then use dump. It can handle multiple tapes. Here is a good reason for creating a special filesystem. It would enable you to make a dump that is only that data. Since dump works on a filesystem level and not individual file level. Good luck, jerry > > Here is what I tried when using tar: 'tar -b 126 -cMpf /dev/nsa0 > /backup' > > Output of 'mt status': > > Mode Density Blocksize bpi Compression > Current: 0x1b variable 0IDRC > -available modes- > 0:0x1b variable 0IDRC > 1:0x1b variable 0IDRC > 2:0x1b variable 0IDRC > 3:0x1b variable 0IDRC > - > Current Driver State: at rest. > - > File Number: 0 Record Number: 0Residual Count 0 > > -CM To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
DLT Backup Questions
I am looking to create a multi-tape backup of close to 260G of data using a DLT-7000 with compression turned on. Does anyone have any recommendations for what to use to accomplish this? Amanda does not support multi-tape archives so that is out of the question. I have tried to use gnu tar but for some reason that was only placing 35G onto each tape (I am trying to use compression.) Here is what I tried when using tar: 'tar -b 126 -cMpf /dev/nsa0 /backup' Output of 'mt status': Mode Density Blocksize bpi Compression Current: 0x1b variable 0IDRC -available modes- 0:0x1b variable 0IDRC 1:0x1b variable 0IDRC 2:0x1b variable 0IDRC 3:0x1b variable 0IDRC - Current Driver State: at rest. - File Number: 0 Record Number: 0Residual Count 0 -CM To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
