Sorry. I should have included a few more details:

Old equipment but more than 2MB/s worth I assume. (AIT-4 rated at ~24MB/s)

Sony SDX-900V AIT-4 inside of a Sony LIB-81
Intel(R) Pentium(R) 4 CPU 3.00GHz
2GB RAM
MySQL 5.0.45
Bacula 5.2.6
CentOS release 5.3 i386


Not using much CPU at all:

  PID   USER      PR  NI  VIRT   RES   SHR S %CPU %MEM    TIME+    COMMAND      
      
 8757   root         15   0   70972  2144 1204  S  0.7      0.1          
11:23.34  bacula-sd  

sar output for some time:

06:40:01 AM       CPU     %user     %nice   %system   %iowait    %steal     
%idle
06:50:01 AM       all      0.65      0.00      0.79      0.00      0.00     
98.56
07:00:01 AM       all      0.61      0.00      0.81      0.00      0.00     
98.58
07:10:01 AM       all      0.62      0.00      0.80      0.00      0.00     
98.57
07:20:01 AM       all      0.65      0.00      0.84      0.00      0.00     
98.51
07:30:01 AM       all      0.64      0.00      0.83      0.00      0.00     
98.52
07:40:01 AM       all      0.65      0.00      0.80      0.00      0.00     
98.55
07:50:01 AM       all      0.65      0.00      0.79      0.00      0.00     
98.56
08:00:01 AM       all      0.61      0.00      0.79      0.00      0.00     
98.60
08:10:01 AM       all      0.62      0.00      0.80      0.00      0.00     
98.58
08:20:01 AM       all      0.64      0.00      0.78      0.00      0.00     
98.57
08:30:01 AM       all      0.61      0.00      0.82      0.00      0.00     
98.57
08:40:01 AM       all      0.64      0.00      0.78      0.00      0.00     
98.58
08:50:01 AM       all      0.64      0.00      0.78      0.00      0.00     
98.58
09:00:01 AM       all      0.63      0.00      0.77      0.00      0.00     
98.59
09:10:01 AM       all      0.64      0.00      0.80      0.00      0.00     
98.56
09:20:01 AM       all      0.63      0.00      0.79      0.00      0.00     
98.58
09:30:01 AM       all      0.70      0.00      0.82      0.03      0.00     
98.44
09:40:01 AM       all      0.63      0.00      0.82      0.00      0.00     
98.55
09:50:01 AM       all      0.65      0.00      0.82      0.00      0.00     
98.52
10:00:01 AM       all      0.72      0.00      0.81      0.00      0.00     
98.47
10:10:01 AM       all      0.70      0.00      0.83      0.00      0.00     
98.46
10:20:01 AM       all      0.73      0.00      0.82      0.00      0.00     
98.44
10:30:01 AM       all      0.69      0.00      0.83      0.00      0.00     
98.48
Average:             all      1.28      0.01      1.02      1.03      0.00     
96.66

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