MTTF, MTBF, MTBR and MTBF for HP ProLiant Gen9

Solution 1:

Don't worry about the MTTF, MTBF, MTBR and MTBF figures... why would those apply to the specifics of your environment?

The servers have internal redundancies and can be extremely stable in production. But that depends on your environment, the disk array/composition, types of disks, RAM quantity, CPU configuration, thermal characteristics, power, etc.

Employing some form of high availability can reduce the potential for downtime and gives you a place to shift your workloads in the event of a failure.

This is a financial and operational risk question.

Perhaps the incremental cost of going from standalone to cluster is high enough that it doesn't make business sense? Perhaps the 2.5 days of downtime (~99.3% availability) is good enough for your operation. You should focus on offsite protection and good backups. All of your HP Gen9 systems are under manufacturer warranty today, so you do have access to parts. If you have RAID, redundant power supplies/fans and stable power, you've covered the most critical areas.

Think of this from a financial perspective and outline the risks, associated costs and try to make a compelling business case for what you want.