On 11/10/2015 08:23 AM, teeeebro wrote:
> The third party application is locked down and we do not have root access to
> the server. We have reached out to them for the version number of
> PostgreSQL.
>
> The application server is a virtual machine (RedHat 6) running on VMware
> 5.5. This is a stand-alone host server running only the third party
> application. This application is used to monitor just over 5000 network
> devices (routers, switches, firewalls, servers, etc.). It receives a LOT of
> information and writes it to disk.
>
> The host server has 2 local 15k drives mirrored. The host server is also
> attached to the SAN via 8GB fiber channel.
>
> For testing we did a base installation of Centos 6 and ran a command line
> test provided by the application vendor.
> *rm -f /tmp/foo && sync && dd if=/dev/zero of=/tmp/foo bs=4k count=12k
> oflag=dsync*
>
> They said we should be see between 7 and 10 MB/Sec.
>
> Writing to the SAN we get around 1.7 MB/Sec.
> Writing to the local drives we get around 11.3 MB/Sec.
Not sure what the command line test has to do with Postgres?
The numbers you report, are they from the script, Postgres or some
combination?
More to the point where does Postgres enter into this?
>
> Just a note: We have a 4 host server cluster of VMware servers running off
> the SAN. There are multiple MSSQL servers running in this cluster as well
> as web servers, etc. etc. About 45 servers in all. We have zero
> performance issues with any of these.
>
> Thoughts?
>
> Thanks again!!
> Terry
>
>
>
> --
> View this message in context: http://postgresql.nabble.com/Disk-I-O-Question-tp5873364p5873398.html
> Sent from the PostgreSQL - general mailing list archive at Nabble.com.
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com