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IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
book

IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning

by Cathy Warrick, Craig Gordon, Benoit Granier, Keitaro Imai, Rosemary McCutchen, Brannen Proctor, Jim Sedgwick, Paulus Usong, Mary Ann Vandermark, John Wickes
December 2005
Intermediate to advanced content levelIntermediate to advanced
530 pages
18h 34m
English
IBM Redbooks
Content preview from IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
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 ...
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ISBN: 0738494119Purchase book