Hello all;

I have always wondered why Sun's default value for maxphys is only 128Kbyte.

In these days of EMC and other fibre related storages, it seemingly does not make sense.

This above is especially so when sd_max_xfer_size is set to 1 Mbyte by default.

Shouldn't the above values all be equal to ensure better IO efficiency?

I've read several documentations on the net and the values I always set for systems I install are;

in /etc/system

set maxphys=8388608

in sd.conf and ssd.conf

sd_max_xfer_size=0x800000

If the system has Veritas, I would also do

set vxio:vol_maxio= 8192

If the system uses SVM/SDS; then

set md_maxphys = 8388608

I would really appreciate feedback on the above values.

Warmest Regards
Steven Sim




Fujitsu Asia Pte. Ltd.
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