Re: Slow Performance on IDS 7.30

Hi Art, I suppose that the Bufwaits Ration you mentioned is a calculated value. I want to check our system. How is it done? Thanks Art S. Kagel <kagel@bloomberg.net> wrote in message news:39A6B13B.DC42449C@bloomberg.net... > First Jason please do not post MIME/HTMP, this is a text only newsgroup. > > JasonYLPang@pg.SLR.com wrote: > > > > Hi all, > > > > why I can't see any kaio at my system?? Currently I have 22 active chunks > > and the aio is only 1. Do I need to increase the number of aio??? > > Your KAIO is working fine. Look at the lines with class 'kio' in the > onstat -g iov output. On the other hand, yes you could use mor AIO VPs.> Even a server running KAIO should have from 4-6 AIO VP, jut look at the > io/wkup value for the lone AIO VP it performs 72 IOs each time it awakens > that has got to be bottlenecking something. > > Your biggest slowdown may be that you have a Bufwaits Ration over 16%. > A BR over 7% is slow over 10% is death! See my config recommendations > below: >

Hi Daniel , There was a great script written by someone on this news group to calculate the BR %. I forget the authors name (sorry) but here it is. It might also be found at the IIUG not checked to see if it is there cut here =========================== onstat -p | /usr/xpg4/bin/awk ' /[a-zA-Z]/{ for (i=1; i <= NF ; i++ ) { name[i]=$i ; } } /[0-9]/{ for (i=1; i <= NF ; i++ ) { content[name[i]]=$i ; } } END { ixdaRA = content["ixda-RA"]; idxRA = content["ixd-RA"]; daRA = content["da-RA"]; RApgsused = content["RA-pgsused"]; print "Read Utilization (UR): ",((RApgsused /( ixdaRA + idxRA + daRA) )*100),"%"; bufwaits = content["bufwaits"]; bufwrits = content["buwrits"]; pagreads = content["pagreads"]; print "BufWaits Ratio(BR): ", ((bufwaits/(pagreads + bufwrits)) *100),"%"; } ' ============================================================ Hope this helps Cheers Pankaj Daniel Willems wrote in message <8odfsl$6s5$1@news0.skynet.be>... |Hi Art, | |I suppose that the Bufwaits Ration you mentioned is a calculated value. I |want to check our system. How is it done? | |Thanks | | |Art S. Kagel <kagel@bloomberg.net> wrote in message |news:39A6B13B.DC42449C@bloomberg.net... |> First Jason please do not post MIME/HTMP, this is a text only newsgroup. |> |> JasonYLPang@pg.SLR.com wrote: |> > |> > Hi all, |> > |> > why I can't see any kaio at my system?? Currently I have 22 active |chunks |> > and the aio is only 1. Do I need to increase the number of aio??? |> |> Your KAIO is working fine. Look at the lines with class 'kio' in the |> onstat -g iov output. On the other hand, yes you could use mor AIO VPs. |> Even a server running KAIO should have from 4-6 AIO VP, jut look at the |> io/wkup value for the lone AIO VP it performs 72 IOs each time it awakens |> that has got to be bottlenecking something. |> |> Your biggest slowdown may be that you have a Bufwaits Ration over 16%. |> A BR over 7% is slow over 10% is death! See my config recommendations |> below: |> | | |

BR = ((bufwaits) / (pagreads + bufwrits)) * 100.0 These are as displayed on the onstat -p output (these may also be extracted from the SMI tables). Art S. Kagel Daniel Willems wrote: > > Hi Art, > > I suppose that the Bufwaits Ration you mentioned is a calculated value. I > want to check our system. How is it done? > > Thanks > > Art S. Kagel <kagel@bloomberg.net> wrote in message > news:39A6B13B.DC42449C@bloomberg.net... > > First Jason please do not post MIME/HTMP, this is a text only newsgroup. > > > > JasonYLPang@pg.SLR.com wrote: > > > > > > Hi all, > > > > > > why I can't see any kaio at my system?? Currently I have 22 active > chunks > > > and the aio is only 1. Do I need to increase the number of aio??? > > > > Your KAIO is working fine. Look at the lines with class 'kio' in the > > onstat -g iov output. On the other hand, yes you could use mor AIO VPs.> > Even a server running KAIO should have from 4-6 AIO VP, jut look at the > > io/wkup value for the lone AIO VP it performs 72 IOs each time it awakens > > that has got to be bottlenecking something. > > > > Your biggest slowdown may be that you have a Bufwaits Ration over 16%. > > A BR over 7% is slow over 10% is death! See my config recommendations > > below: > >

Thanks, it was veyr usefull. But there's a little error I believe bufwrits = content["buwrits"]; should be bufwrits = content["bufwrits"]; Pankaj <pankaj@punks.demon.co.uk> wrote in message news:967466036.25679.0.nnrp-08.d4e5c55a@news.demon.co.uk... > Hi Daniel , > > There was a great script written by someone on this news group to calculate the > BR %. I forget the authors name (sorry) but here it is. > It might also be found at the IIUG not checked to see if it is there > > cut here > =========================== > > onstat -p | /usr/xpg4/bin/awk '> -zA-Z]/{ > for (i=1; i <= NF ; i++ ) { > name[i]=$i ; > } > > } > /[0-9]/{ > for (i=1; i <= NF ; i++ ) { > content[name[i]]=$i ; > } > } > END { > ixdaRA = content["ixda-RA"]; > idxRA = content["ixd-RA"]; > daRA = content["da-RA"]; > RApgsused = content["RA-pgsused"]; > print "Read Utilization (UR): ",((RApgsused /( ixdaRA + idxRA + daRA) )*100),"%"; > > bufwaits = content["bufwaits"]; > bufwrits = content["buwrits"]; > pagreads = content["pagreads"]; > print "BufWaits Ratio(BR): ", ((bufwaits/(pagreads + bufwrits)) *100),"%"; > > } > ' > > ============================================================ > > Hope this helps > > Cheers > > Pankaj > > Daniel Willems wrote in message <8odfsl$6s5$1@news0.skynet.be>... > |Hi Art, > | > |I suppose that the Bufwaits Ration you mentioned is a calculated value. I > |want to check our system. How is it done? > | > |Thanks > | > | > |Art S. Kagel <kagel@bloomberg.net> wrote in message > |news:39A6B13B.DC42449C@bloomberg.net... > |> First Jason please do not post MIME/HTMP, this is a text only newsgroup. > |> > |> JasonYLPang@pg.SLR.com wrote: > |> > > |> > Hi all, > |> > > |> > why I can't see any kaio at my system?? Currently I have 22 active > |chunks > |> > and the aio is only 1. Do I need to increase the number of aio??? > |> > |> Your KAIO is working fine. Look at the lines with class 'kio' in the > |> onstat -g iov output. On the other hand, yes you could use mor AIO VPs. > |> Even a server running KAIO should have from 4-6 AIO VP, jut look at the > |> io/wkup value for the lone AIO VP it performs 72 IOs each time it awakens > |> that has got to be bottlenecking something. > |> > |> Your biggest slowdown may be that you have a Bufwaits Ration over 16%. > |> A BR over 7% is > slow over 10% is death! See my config recommendations > |> below: > |> > | > | > | > >