JBucanek Posted April 7, 2002 Report Share Posted April 7, 2002 Hello all, I have a Mac OS X Server, running Retrospect Workgroup Server 5.0, backing up to a SCSI tape drive. I've got a really annoying performance problem when backing up computers over the network. It appears that the network just isn't quite fast enough to feed the tape (2MB/sec) continuously. So after writing a bit, the tape stops, rewinds a little, repositions, then starts writing again. This is as one would expect. But the problem is that not more than a second after the tape stops and begins backing up, Retrospect stops reading from the network. It's acting like it's internal buffer has filled up and it's not going to read anymore until it can empty some of the buffer by writing to the tape. The problem is that the buffer seems to be fairly small (a few MB), so when it does start writing to the tape again the buffer quickly empties and whole mess starts over. The net result (no pun intended) is that backups from the local HD run at about 100+MB/min, while backups over the network run at less than 40MB/min. Looking at the network traffic through the router, the network is idle almost 50% of the time. So, in theory, I should be able to backup my network computers at close to 80MB/min -- if only I could get Retrospect's buffer big enough to stop playing musical chairs with the network. Is there any way of doing this? I have *gobs* of RAM. James  Not to mention the additional wear and tear on my tape drive. Link to comment Share on other sites More sharing options...
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