After having a good sleep I attended the first session in the morning from George Djerdj Srdanov with a presentation called “How to Get the Most Out of Your I/O Subsystem?”. George dived deep into the I/O subsystem, with the following important subjects:

• Different RAID configurations (Read and Write penalties)
• SSD usage
• SAN configuration
• Block alignment and recommendation

George Djerdj Srdanov presenting at Hotos 2013

The presentation was good and triggered me to check some things at a customer I am currently working for. In the customer case the block alignment in regard of the online redolog files might be a point of investigation. Continue reading →