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DS8800 Performance Monitoring and Tuning
book

DS8800 Performance Monitoring and Tuning

by Gero Schmidt, Bertrand Dufrasne, Jana Jamsek, Peter Kimmel, Hiroaki Matsuno, Flavio Morais, Lindsay Oxenham, Antonio Rainero, Denis Senin
July 2012
Intermediate to advanced content levelIntermediate to advanced
726 pages
26h 28m
English
IBM Redbooks
Content preview from DS8800 Performance Monitoring and Tuning
376 DS8800 Performance Monitoring and Tuning
򐂰 Adjust the maximum I/O size for each device driver if you must work with I/Os larger than
1 MB. For example, perform these tasks to change to an I/O size of 4 MB:
sd (SCSI Device Driver): Edit the file /kernel/drv/sd.conf and add a line with
sd_max_xfer_size=0x400000
ssd (Fibre Channel Device Driver): Edit the file /kernel/drv/ssd.conf and add a line
with ssd_max_xfer_size=0x400000
st (Tape Device Driver): Edit the file /kernel/drv/st.conf and add a line with
st_max_xfer_size=0x400000
9.4.10 FC adapter
AMCC (formerly JNI), Emulex, QLogic, and SUN FC adapters are described in the DS8000
Host System ...
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Publisher Resources

ISBN: 0738436836Purchase book