https://community.hpe.com/t5/operating-system-hp-ux/scalability-problem-with-disk-io/m-p/3957182#M761408 Hello,<BR /><BR />I have a problem in scaling disk i/o. The machine is an 11i v2 itanium application server with two HP EVA's ( 75 gig, 15k rpm each).<BR /><BR />AVerage values of sar output is given below,<BR /><BR />c0t6d0 8.67 0.67 11 113 0.16 16.62<BR />c127t0d7 78.73 0.52 716 24672 0.06 3.44<BR />c80t0d3 77.73 0.51 700 24256 0.03 3.44<BR />c57t1d2 77.03 0.51 722 24917 0.01 3.12<BR />c32t0d6 78.71 0.51 737 25241 0.02 3.40<BR />c95t0d2 77.69 0.51 721 24975 0.02 3.30<BR />c102t1d1 79.77 0.51 973 39190 0.01 2.45<BR />c53t0d5 78.73 0.51 726 24764 0.02 3.45<BR />c16t0d1 77.59 0.51 718 24686 0.02 3.35<BR />c102t1d3 70.10 0.50 3385 54153 0.00 0.21<BR />c65t1d0 0.02 0.50 0 0 0.00 0.24<BR /><BR />AVerage CPU usage using sar,<BR /><BR />HP-UX rx8640f B.11.23 U ia64 03/05/07<BR /><BR />13:02:38 %usr %sys %wio %idle<BR />Average 30 13 32 25<BR /><BR /><BR />I tried tweaking scsi_max_qdepth, but it was of no use. My cpu consumption is only around 40% but I am not able to scale up my I/O capcity.<BR /><BR />How to determine the problem with IO, ?<BR /><BR />Cheers,<BR />Chetan Wed, 07 Mar 2007 04:21:29 GMT chetan a 2007-03-07T04:21:29Z https://community.hpe.com/t5/operating-system-hp-ux/scalability-problem-with-disk-io/m-p/3957182#M761408 Hello,<BR /><BR />I have a problem in scaling disk i/o. The machine is an 11i v2 itanium application server with two HP EVA's ( 75 gig, 15k rpm each).<BR /><BR />AVerage values of sar output is given below,<BR /><BR />c0t6d0 8.67 0.67 11 113 0.16 16.62<BR />c127t0d7 78.73 0.52 716 24672 0.06 3.44<BR />c80t0d3 77.73 0.51 700 24256 0.03 3.44<BR />c57t1d2 77.03 0.51 722 24917 0.01 3.12<BR />c32t0d6 78.71 0.51 737 25241 0.02 3.40<BR />c95t0d2 77.69 0.51 721 24975 0.02 3.30<BR />c102t1d1 79.77 0.51 973 39190 0.01 2.45<BR />c53t0d5 78.73 0.51 726 24764 0.02 3.45<BR />c16t0d1 77.59 0.51 718 24686 0.02 3.35<BR />c102t1d3 70.10 0.50 3385 54153 0.00 0.21<BR />c65t1d0 0.02 0.50 0 0 0.00 0.24<BR /><BR />AVerage CPU usage using sar,<BR /><BR />HP-UX rx8640f B.11.23 U ia64 03/05/07<BR /><BR />13:02:38 %usr %sys %wio %idle<BR />Average 30 13 32 25<BR /><BR /><BR />I tried tweaking scsi_max_qdepth, but it was of no use. My cpu consumption is only around 40% but I am not able to scale up my I/O capcity.<BR /><BR />How to determine the problem with IO, ?<BR /><BR />Cheers,<BR />Chetan Wed, 07 Mar 2007 04:21:29 GMT https://community.hpe.com/t5/operating-system-hp-ux/scalability-problem-with-disk-io/m-p/3957182#M761408 chetan a 2007-03-07T04:21:29Z