
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 ...