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You do not say what type of controller but the engineer ought to sort out the RAID config anyway assuming the controller doesn't do it automatically. 
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You do not say what type of controller but the engineer ought to sort out the RAID config anyway assuming the controller doesn't do it automatically.

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We have a server with 5 HDD's<br />
<br />
Two acting as RAID1<br />
Three as RAID5<br />
<br />
The RAID controller is faulty and a service engineer is coming to replace the controller.<br />
<br />
Once this has been done, do we need to do anything? Or will the server work as normal?
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We have a server with 5 HDD's

Two acting as RAID1
Three as RAID5

The RAID controller is faulty and a service engineer is coming to replace the controller.

Once this has been done, do we need to do anything? Or will the server work as normal?

RAID Controller

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

RAID stands for Redundant Array of Independent Disks.

RAID is data storage technology that allows multiple drives to be used together as a single virtual drive for reasons such as fault tolerance, reliability and performance. 

There are several different levels of RAID that determine how the data is stored and the level of redundancy achieved across the drives.