Hello,
We have long running problem with NetApp filers. When we connect server to the filer sequential read performance is ~70MB/s. But once we run database on the server seq read performance drops to ~11MB/s. That's happening with two servers. One is running Oracle another - MySQL. During speed tests database load is very light (less than 1MB/s of reads and writes). During the tests NetApp was serving only these two servers.
What could be causing such slowdown and overall slow read performance? Writes are fast >100MB/s.
NetApp support is claiming that such performance is normal. Somehow I do not believe that 2007 model should deliver such XXth century performance levels. :)
RHEL4 fully updated 64 bits connected to NetApp FAS3040 via SAN using Qlogic 2Gb/s FC adapters. Tried both drivers from Redhat and QLogic (for NetApp). Also changing of FC parameters (like queue size) did not help.
Regards,
Mindaugas