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Operating Systems Solaris Why is restore slower than backup? Post 69420 by deckard on Thursday 14th of April 2005 02:28:54 PM
Old 04-14-2005
OK. That makes a good deal of sense. I have to assume then that the backup program doesn't actually store the attributes with the file, but in a separate store of some kind. Especially in the case of a raw dump type utility. This would explain why, when my restore completed, I am prompted with a question asking if I want to restore owner:group attributes. So, my files are probably written from the tape to the drive with the owner:group set to the user who is running the restore (in my case 'root'). Afterwards, the final process runs through the restored files and then does a chown on each of them. Hehehe... I think there is also the distinct possibility that the tape drive I'm dealing with just has crappy performance in Solaris too.
 

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AMVERIFY(8)						      System Manager's Manual						       AMVERIFY(8)

NAME
amverify - check an Amanda tape for errors SYNOPSIS
amverify config [ slot [ runtapes ] ] DESCRIPTION
Amverify reads an Amanda format tape and makes sure each backup image can be processed by amrestore and, if possible, the appropriate restore program (e.g. tar). Amverify runs amrestore on each file of the tape and pipes the output to a restore program (if available) with an option to create a cata- logue of the backup. The catalogue itself is discarded. Only the success or failure of the operation itself is reported. If the backup image cannot be processed by the restore program, e.g. if it was written on a different operating system, the image is sent through dd to /dev/null. This still determines if the tape is readable, but does not do any internal consistency check on the image. If config is set up to use a tape changer, the slot argument may be used to choose the first tape to process. Otherwise, the current slot is used. The runtapes configuration parameter determines how many tapes are processed unless it is specified on the command line. See the amanda(8) man page for more details about Amanda. AUTHOR
Axel Zinser <fifi@icem.de> SEE ALSO
amrestore(8), amanda(8), amverifyrun(8) AMVERIFY(8)
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