Re: KAIO vps, and bufwaits

Neil Truby wrote in message <34DB88BE.56A3@netcomuk.co.uk>... >Does anyone know how to set up extra KAIO vps? The KAIO bits are connected to the CPU vp bits. If you add another CPU vp you will appear to get an extra "KAIO vp" although I think you'll find it is actually part of the CPU vp. >Also, despite having 200M of BUFFERS, onstat -p is still showing some >bufwaits. The read cache rate is above 99%, but the write remains >around 87% - the same as on the Sparc when BUFFERS was set to 50M. The >new system isn't swapping and hardly pages; do the bufwaits suggest a >further increase in BUFFERS is warranted? The bufwaits may be there as a result of checkpoint activity. Your write cache rate will depend on what program code you are running. If applications are doing mostly updates the cache rate will climb and with mostly inserts it will fall. You can't do a lot about it so I wouldn't worry too much. If you have the physical memory, more BUFFERS is hardly ever a bad idea...but if the thing is performing OK and the punters are happy, leave it as it is.