We are currently running CentOS 5 update 4 on a Dell R910 server 16 cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g DB server for one of our customers and is attached to an MD 3000 storage array. We are having a load averaging around 5 but see no swap in use, CPUs are pretty much idle and no I/O wait. We have Oracle dataguard turned on in transactional mode. I've checked everything that I can think of, there are no Oracle processes running which would cause a spike. Anyone have any ideas as to what to check next? I have another R910 configured the same way and do not see any issues with the 3 databases running on that server. The load is at .5.
On 20 August 2010 19:48, Ed Donahue <liberaled at gmail.com> wrote:> We are currently running CentOS 5 update 4 on a Dell R910 server 16 > cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g > DB server for one of our customers and is attached to an MD 3000 > storage array. We are having a load averaging around 5 but see no swap > in use, CPUs are pretty much idle and no I/O wait. We have OracleThat's a high load average. What's top/nmon reporting? Run nmon with -t -f -s 10 -c 180 to collect half an hours worth of data and put it through the analyser. It should give you a good idea of what's happening on your server. Are your servers purely Oracle servers or are they also serving other software? Any slow NFS mounts? -- Hakan (m1fcj) - http://www.hititgunesi.org
Load isn't a bad thing. Load is the number of processes in the run queue. You have 16 cores and only 5 processes in the run queue. Are you witnessing poor responsiveness on that server? What are you trying to really troubleshoot? On 20 Aug 2010 19:49, "Ed Donahue" <liberaled at gmail.com> wrote:> We are currently running CentOS 5 update 4 on a Dell R910 server 16 > cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g > DB server for one of our customers and is attached to an MD 3000 > storage array. We are having a load averaging around 5 but see no swap > in use, CPUs are pretty much idle and no I/O wait. We have Oracle > dataguard turned on in transactional mode. I've checked everything > that I can think of, there are no Oracle processes running which would > cause a spike. Anyone have any ideas as to what to check next? > > I have another R910 configured the same way and do not see any issues > with the 3 databases running on that server. The load is at .5. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100820/3b5c6cba/attachment-0002.html>
On Fri, Aug 20, 2010 at 2:48 PM, Ed Donahue <liberaled at gmail.com> wrote:> We are currently running CentOS 5 update 4 on a Dell R910 server 16 > cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g > DB server for one of our customers and is attached to an MD 3000 > storage array. We are having a load averaging around 5 but see no swap > in use, CPUs are pretty much idle and no I/O wait. We have Oracle > dataguard turned on in transactional mode. I've checked everything > that I can think of, there are no Oracle processes running which would > cause a spike. Anyone have any ideas as to what to check next? > > I have another R910 configured the same way and do not see any issues > with the 3 databases running on that server. The load is at .5.Do you have sar (sysstat) installed and running? That will gather stats 1x per minute on the server and you can see more than what a typical 'top' will show you. You can also graph the output using ksar, which will make it easier to see things.