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тАО08-13-2008 05:29 PM
тАО08-13-2008 05:29 PM
How to compress data using backup command.
Systemя╝ЪOPENVMS 6.2-1H3
Tape playerя╝Ъ TLZ10
Tapeя╝ЪHP DDS3 12GB-24GB
Description of back-up erroneous data report:
The data volume is about 20GB, when BACKUP/image/log dka300:[000000...]*.*;* mka400:aaa.bck ve_set is
used for data back up and it reaches around 10GB, the tape is automatically sprung to hint to change
the tape. After the tape is changed, the system is down and nothing happens in typing the keyboard, the
system has to be rebooted (this would occur more if the tape is changed in a slower motion).
Is this practice for data back up applicable, is there any other wayя╝М is compression possible in
backing up 20GB into a tape, how to carry it out specifically and what requires are needed, your helps
shall be much appreciated, thank.
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тАО08-13-2008 06:29 PM
тАО08-13-2008 06:29 PM
Re: How to compress data using backup command.
To get the higher of the two densities specified for DDS/DAT and DLT-series drives (assuming the data itself is not already compressed) enable compaction on the BACKUP, INITIALIZE and the MOUNT. Specifically, see /MEDIA_FORMAT=COMPACTION.
There's no supported data compression on BACKUP (other than the drive-level compression mentioned above), and the unsupported compression latent in BACKUP requires a much more recent OpenVMS release.
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тАО08-13-2008 11:07 PM
тАО08-13-2008 11:07 PM
Re: How to compress data using backup command.
/BLOCK=32768 or up to /BLOCK=65024.
(The default I think is 8192, using more space and slows down tape).
System hanging when asking for a continuation tape ? Maybe there is an operator request unanswered.
It depends on the MOUNT command used (MOUNT/NOASSIST), and wether there is an operator terminal enabled. To see if there is a operator request outstanding, better have a second terminal(window) open as operator (REPLY/ENABLE=TAPE/TEMP), and see if there will be a request issued.
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тАО08-14-2008 05:39 AM
тАО08-14-2008 05:39 AM
Re: How to compress data using backup command.
The XOR redundancy add 10% to the uncompressed data, but since it appears more random, it usually will compress less, so it effectively uses more than 10% of a compressed tape. The only time that won't be true is if the data already looks random, i.e. if it is already compressed, or has been encrypted before it is sent to the drive.
If you need to encrypt the data you send offsite, the compression in the drive will not help. You need to compress the data before you encrypt it.
Jon
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тАО08-14-2008 11:03 AM
тАО08-14-2008 11:03 AM
Re: How to compress data using backup command.
It's possible the tape drive is having hardware issues and not identifying the second tape.
And the standard question, has this worked in the past or did your backup just start going to a second tape recently?
Andy
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тАО08-14-2008 05:12 PM
тАО08-14-2008 05:12 PM
Re: How to compress data using backup command.
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тАО08-17-2008 10:31 PM
тАО08-17-2008 10:31 PM
Re: How to compress data using backup command.
If after all the advices are implemented the tape is still to small, then try a new tape. Your tape could be bad (some kind of bad blocks).
Wim