Not true. There are different ways that a storage array, and it's
controllers, connect to the host visible front end ports which might be
confusing the author but i/o isn't duplicated as he suggests.
On 4/4/2010 9:55 PM, Brad wrote:
I had always thought that with mpxio, it load-balances IO request across your
storage ports but this article
http://christianbilien.wordpress.com/2007/03/23/storage-array-bottlenecks/ has
got me thinking its not true.
"The available bandwidth is 2 or 4Gb/s (200 or 400MB/s – FC frames are 10 bytes long
-) per port. As load balancing software (Powerpath, MPXIO, DMP, etc.) are most of the
times used both for redundancy and load balancing, I/Os coming from a host can take
advantage of an aggregated bandwidth of two ports. However, reads can use only one path,
but writes are duplicated, i.e. a host write ends up as one write on each host port."
Is this true?
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