Let’s look at a real-world example: Vodafone utilise a Sunrise Computer Maintenance Ltd RAID array on their 24-hour mobile phone network. The RAID array is attached to two hosts, in this case OEM Sun Enterprise 450 based systems. The RAID level 5 protected capacity is split 50/50 and each half assigned to one host. Under normal operation, each host simply uses its own half of the RAID array. However, if one host should fail, then the ‘good’ host simply picks up the failed host’s half, therefore allowing users to continue to access their data.