berkley@wucs1.wustl.edu (Berkley Shands) (01/05/91)
While I'm new at the SGI game, it seems to me that I should get more than 408Mb on an 8mm tape with bru. What am I missing ? bru -cvR -b 128K -s 32678M /usra /usrb /usrc /usrd /usre /usrf > 01.04.91 & SYSLOG reports errors on the tape (I think the drive needs to be cleaned). Berkley Shands
olson@anchor.esd.sgi.com (Dave Olson) (01/05/91)
In <1991Jan4.164235.28245@cec1.wustl.edu> berkley@wucs1.wustl.edu (Berkley Shands) writes: | While I'm new at the SGI game, it seems to me that I should get more | than 408Mb on an 8mm tape with bru. What am I missing ? | | bru -cvR -b 128K -s 32678M /usra /usrb /usrc /usrd /usre /usrf > 01.04.91 & | | SYSLOG reports errors on the tape (I think the drive needs to be cleaned). Depends on what size cartridge you are using. On the 512 Mbyte cartrige, getting 408 Mb with bru is not completely unreasonable, since bru uses a lot of space for checksum's and file headers. You could also be losing tape capacity due to retries (the drive will try to rewrite bad blocks a number of times in successive positions before giving up). You could also simply be getting an unrecoverable write error. A summary of the error messages would help diagnose the problem. Finally, if you have reason to believe the tape heads are dirty, by all means get a DRY (not wet) cleaning kit and clean it, then try again. -- Dave Olson Life would be so much easier if we could just look at the source code.