What is write order fidelity? Please elaborate.
This is a Q&A from
SAN School Lesson 6
Click here for more
SAN School lessons
Write order fidelity is a term that describes the ability of d
hardware or software to move data between geographic locations while keeping consistency for transaction oriented applications. In other words, it's the ability to keep data "in the same sequence" as it was written at the originating source.
This is extremely important for database consistency. If data is written in an incorrect sequence at different sites, the transaction logs will no longer be consistent and databases can become corrupt at the remote site. The operations are kept in proper sequence by assigning either a timestamp or sequence number to each write at the source site. The data is then transmitted to the remote site over multiple links for load balancing or
for longer distances, then reordered to the proper time sequence before written to the logs at the remote site.
Dig deeper on SAN management
SAN expert Chris Poelker compares connecting a SAN with wavelength cabling and dark fiber and discusses the pros and cons of each.continue reading
SAN expert Chris Poelker discusses how to change the size of a LUN in a Microsoft cluster server environment.continue reading
Storage expert Chris Poelker discusses SATA/SCSI compatibility issues in this expert advice article.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.