Re: EMC Storage Array Issue

Hi Scott,

  Recently we had issues with EMC. Last week we started getting IO timeout on one of our frames followed by files being accessed disappearing. We lost controlfiles, redo log files and library files. EMC hasn't been able to tell us why it happended. I would like to hear about solutions/explanation they come up with for your problem.

Regards,
Denny

Quoting Scott Canaan <srcdco_at_ritvax.rit.edu>:

> 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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