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05-30-2014 01:59 AM
05-30-2014 01:59 AM
Cache mem hit is always 100%
Hi we have hpux 11iv3 servers where Cache Memory hit is always 100% .
We are experiencing tremendous performance issues.
Filecache_max = 5%
filecache_min= 3%
Oracle 11g
Checked it from Perfware tool .
PFA log
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05-30-2014 12:59 PM
05-30-2014 12:59 PM
Re: Cache mem hit is always 100%
>Cache Memory hit is always 100%
This cache hits are usually a good thing. Unless you want to blame applications for always reading/writing the same thing.
How much memory do you have? What kind of applications are you running? What does "swapinfo -tam" show?
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05-31-2014 10:04 PM
05-31-2014 10:04 PM
Re: Cache mem hit is always 100%
Hi Dennis,
root #/ >sw
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 204800 0 204800 0% 0 - 1 /dev/vg00/lvol2
reserve - 58890 -58890
memory 249227 37490 211737 15%
total 454027 96380 357647 21% -
We are getting performance issue since we have migrated from 9i to 11g also from 11iv2 to 11iv3 .
Oracle guy saying he has chekd all parameters , sga , auto mm is disabled .
We are having EMC VNX5500 with fast cache 200 GB SSD + 24GB internal cache .
We have 2 app servers with 16cores / 256GB RAM .
2 DB Servers with with 16cores / 256GB RAM .
What we have observed is when all batch jobs start at same time , the system just chokes .
Jobs that used to take 40 min to complete , now are taking 120 min .
Everything has gone for toss in this new setup .
EMC analysis showing SP's are unbalanaced , apart from that nothing .
We have installed powerpath in those servers.
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06-01-2014 12:02 AM - edited 06-01-2014 12:04 AM
06-01-2014 12:02 AM - edited 06-01-2014 12:04 AM
Re: Cache mem hit is always 100%
dev 204800 0 204800 0%
reserve - 58890 -58890
memory 249227 37490 211737 15%
total 454027 96380 357647 21%
This says you have way too much device swap. And plenty of memory.
What is your size of shared memory for your SGA?
http://h30499.www3.hp.com/t5/Databases/shmmax-and-oracle-sga/td-p/3963396
Do you have glance installed?
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06-01-2014 10:28 PM - edited 06-01-2014 11:25 PM
06-01-2014 10:28 PM - edited 06-01-2014 11:25 PM
Re: Cache mem hit is always 100%
Hi Dennis ,
We have glance installed.
We have 20 databases on on server.
All SGA mounting to approx 60 GB .
Can we check something from OS end , some sar statistics .
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06-02-2014 11:02 PM - edited 06-03-2014 12:24 AM
06-02-2014 11:02 PM - edited 06-03-2014 12:24 AM
Re: Cache mem hit is always 100%
Hi Dennis ,
when we changed max_queue_depth to 128 , we got desired performance.
We changed it for only 1 lun as of now.
Hi is it safe to change this kernel parameter online ? Can we change it ?
Why this issue was not faced in 11iv2 ?
PFA sar -H 5 5 which shows the write MB/s is very very low , though its of during off hrs , i will collect same when system is busy and share here .