High redundancy provides more usable storage.

Normal redundancy provides more usable storage.

High redundancy gives you better I/O performance.

High redundancy provides High Availability (HA) during disk failure and rolling Storage Server patching

Normal redundancy provides HA during rolling Storage Server patching.

Backing up database servers and storage cells is not recommended before performing plannedmaintenance.

Database server updates can be rolled back using the the “yum downgrade"procedure.

Bundle patches do not require testing before being installed on a production system.

It is recommended that Exadata systems with Data Guard configured use the"Standby First" patching approach.

Patching should never be interrupted due to a connection drop. It is therefore recommended that you use VNC or the screen utility.

Before patching cells in a rolling manner, you must check asmdeactivationoutcome amModestatus and make sure that cells on all disks are online and that disks can be deactivated.

adding a High Capacity Storage expansion rack

expanding the Exadata rack from a Half Rack to a Full Rack

moving underutilized grid disks fromthe RECO diskgroup to DATA

adding a ZFS storage appliance

adding a High Performance Storage expansion rack