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About kelufeng

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  1. Firewire 800; no other devices on firewire. I erased the tape in vxatool first; admit I don't know if that makes it return to the beginning. Sorry I'm pretty new at this. It's doing a backup now, but I'll try the write test with the capacity optimization this afternoon. I did turn on compression using the ./vxatool TAPE1 C 1 command before the previous write test posted above. Thanks again for the help.
  2. The thing is, if Retrospect's reporting is accurate I always get the same amount of storage (77.8GB +/- 0.1 GB) over different data collections, which to me means either all my data is uncompressible, compressible by exactly the same (very small) amount, or compression isn't working. Here's a write test, read is still in progress; I can post the final result in a bit. singapore:/Applications/Exabyte admin$ ./vxatool TAPE1 -t -m 99999 vxatool V4.62 -- Copyright © 1996-2006, Exabyte Corp. Tape Drive identified as VXA2 TAPE1 - SCSI Load Tape...OK TAPE1 - Test size = 99999 MB (command line override) TAPE1 - Rewriting Logical Begin of Tape (LBOT)...OK 0 Writing 99999Mb [WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW] 100 % TAPE1 - Reached end of tape after 68440 MB Let me know if that's not what you meant. This tape has just been used once, assume I should be getting about 80GB, so I'm a bit confused about the 68GB result. Let me know if you have any ideas, thanks for the help.
  3. Oh, and I'm running OS X 10.4.11 Server.
  4. Details: vxatool V4.62 -- Copyright © 1996-2006, Exabyte Corp. Tape Drive identified as VXA2 TAPE1 - Vendor : EXABYTE TAPE1 - Product ID: VXA-2a TAPE1 - Firmware : 2122 TAPE1 - Serialnum : 0085237026 TAPE1 - Cleaning : 12 Tape Motion minutes ago Firewire drive using Retrospect 6.1.138 on Dual 2GHz PowerPC G5. I'm unable to get compression to work – either hardware or software. One volume I'm trying to back up is about 85 GB, and it won't quite fit on a X23 80/160 no matter what I do (this example is why I think the estimate of 77.8 GB per tape is pretty accurate – this is consistently what Retrospect reports +/- 0.1 GB). I've used the vxatool to turn hardware compression on and off; while hardware compression was turned off I tried enabling software compression, but got the same results. I don't know much about how this works, but I tried zipping some of the data (mostly Office docs, pdfs, etc) just as a test and it is compressible by software – usually 20-30%, so I can't see why this isn't working. Tandberg support hasn't been very helpful; my last email exchange they asked me to check the block size, which I'm unsure how to do. They said both Retrospect (under configurations) and the vxatool could report the block size, but I don't see the option anywhere and they haven't replied to my email asking for the specific command in the vxatool. Does anyone have any advice?