Why is lack of write ordering guarantee not mentioned more?

Why is the lack of a write ordering guarantee (i.e. the use of a track table as opposed to a side file, with the EMC SRDF -- async mode or adaptive copy solution) not mentioned more in the storage industry? I believe that I have read many storage documents that tout EMC's SRDF solution capabilities but very few that mention this.

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While it would not be appropriate for me to attempt to represent the entire EMC marketplace, I will, nevertheless, take my best shot. (Far be it from me to do the appropriate thing.)

As far as I know, EMC has successfully side-stepped the issue by de-emphasizing their asynchronous capabilities, while emphasizing synchronous replication, along with their semi-synchronous replication. They also do a remarkably good job in managing what gets published about them.

I hope this is helpful. Thanks for writing.

This was first published in May 2003

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