why sar -b 只有pread/s 和 pwrit/s列有数据，其他列数值都是0?

cnsun

HP-UX 上结果正常，是否有参数需要设置？请指教！

悟人

看看这个,应该能明白点:
Reports buffer activity for transfers, accesses, and cache (kernel block
buffer cache) hit ratios per second. Access to most files in AIX Version 3
bypasses kernel block buffering and therefore does not generate these
statistics. However, if a program opens a block device or a raw character device
for I/O, traditional access mechanisms are used making the generated statistics
meaningful