Hi Experts
I was investigating some performance problem. My investigation concluded with IO subsystem+memory issue. But actual problem turned out to be an issue with NIC.
The physical is only connecting to the SAN using 1 x 1Gig NIC it should be using 3 x 1Gig NIC.
So currently all the iSCSi traffic seems to be flowing down 1 link
PAGEIOLATCH_SH and Low ple led me to conclude on IO and memory issue
The server in question is an OLAP server, its a transnational subscriber as well
Server spec
Windows 2008 ent x64 on hyper-v, 32 GB
SQL server 2008 r2 ent x64 with min memory 28500 mb max 30500MB
Storage: SAN,drives are pass through onto the SAN
db size: 443 gb ,
main table
Rows : 270178960
Data : 66116224 KB
index :339679744 KB
At the time of analysis all active spid's were showing PAGEIOLATCH_SH wait.
What I am trying to understand is why SQL Wait or Perfomon counters did show any network related issue
please see the screenshots bellow
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