Lotus Notes’ RAID technology is used to protect data from being destroyed in the event of a disk failure. It is a system that combines multiple hard disk drives to form one file system and uses fail-tolerance in order to restore information in the event that a single drive fails. This technology is ideal for companies who want to make sure that their information is always accessible.
A search in the Lotus Notes iDataAgent catalog retrieves the transaction log of a database, and associates it with a specific Notes database. The transaction log is broken down into smaller data files, known as sign extents. Each one is 64MB. Each sign extent includes an entry indicating the date on which the database was established and when the Fixup activity was running prior to it.
There are different levels of raid. Each has different level of performance and the ability to tolerate faults. RAID 1 is most common because it uses mirroring to double the storage capacity. However, it’s not 100% secure. If the failed mirrored disk is damaged it will take hours to recover data from remaining drives. RAID 5 is a different option that combines striping with parity to provide good storage and performance. It requires two additional disks to achieve parity but offers the best balance of storage and efficiency.