read cache hit rate at 0

[John Oberlander]

I have a HP4440 running 11.11 and a CACHE database. Last year i increased the buffereche to 2G and had the read% in the 90's, everything was running good. A few weeks ago i installed all the latest patches via a patch assessment. The system hasn't ran well since. When i do sar -b now, this is what i get. How do i tell if the bufferecahe is really working, or if this is a real issue?

[Steven E. Protter · Accepted solution]

Shalom John,

You seem to have run into a bug.

See if this collection software helps:
http://www.hpux.ws/system.perf.sh

It might be a problem with the data collection utility, except for the fact your system does not perform correctly.

swverify \*

Make sure everything is installed correctly.

Re-read the patch for what you installed. See if there is a single patch that can cause this problem.

Open a Response Center call, they will probably take it whether or not you have support due to the possibility a bad patch has been released. They take these situations very seriously.

SEP

[John Oberlander]

I installed about 500M worth of patches and just did ran the swverify without any issues.

Im cant be positive to blame the performance on this, more than likely its a new job that is running that i haven't cought yet. (typical sysadmin answer)

I dont see this value within glance, am i missing it?

Thanks,
John

[Ninad_1]

John,

I dont whether glance and sar get the stats from the same source. But if you have glance try this to cross check.

echo "PRINT GBL_MEM_CACHE_HIT_PCT,GBL_MEM_CACHE_WRITE_HIT_PCT" > mysyntax.dat

glance -adviser_only -syntax mysyntax.dat -j 5 -iterations 10

Regards,
Ninad

[John Oberlander]

Thanks for the help!