After installing dump-0.4b4-9.i386.rpm, my backup script started failing, with a "DUMP: Please choose a blocksize <= 64KB" message, and a commandline that read: /sbin/rdump 0ubdsf 126 62500 76800 poplar:/dev/rmt/0n / Rolling back to dump-0.3-17.i386.rpm fixed the problem. Environment: P233 RH6.0 32Mb RAM 4.3Gb drive remotely backing up to Solaris 2.6 Sparc 10 server onto an Exabyte 8mm tapedrive. Steve
This a feature not a bug. There are few performance gains (and possible losses!) with large block sizes due to max TCP window sizes and/or physical DMA allocation. Does dump-0.4b4 with 64K buffers run significantly slower than dump-0.3 with 768K buffers to solaris server? Are you sure that the blocksize and not some other factor that is the rate limiting parameter?
jbj is the dump guru.