EMC Storage Array Issue

    We have implemented a Sun Solaris Cluster (4 machines), connected to an EMC storage array. The migration began last fall, and we now have 15 Oracle instances, with a mixture of 8.1.6 and 8.1.7, located there. We recently have had 2 occurances of asynchronous I/O wait times exceeded. When this occurs, every database crashes at the same time. The solution from EMC is to turn asynchronous I/O off in all of the Oracle instances
(disk_async_io = false) and to increase the database writer slaves
(dbwr_io_slaves = <something not 0>) to emulate asynchronous I/O.

    Has anyone run into this problem before? If so, how did you "correct" it? My feeling is that EMC is trying to give us a bandage to cover up the real problem, by trying to get Oracle to ignore it.

Thank you.

--
Scott Canaan (srcdco_at_rit.edu)


(585) 475-7886

"Life is like a sewer, what you get out of it depends on what you put
into it" - Tom Lehrer


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