
Chapter 7. Open systems servers - UNIX 229
The following command will perform sequential writes to your LUNs:
dd if=/dev/zero of=/dev/rvpath0 bs=128k
dd if=/dev/zero of=/dev/rvpath0 bs=1024k
time dd if=/dev/zero of=/dev/rvpath0 bs=128k count=781
Try different block sizes, different raw vpath devices, combinations of reads and writes. Run
the commands against the block device (/dev/vpath0) and notice that block size does not
affect performance.
7.7.2 Verifying your system
So far, we have just been playing around with the dd command. But the next section, 7.8,
“Volume groups, logical volumes and file systems” on page 233, will explore the use of the ...