A great way to have higher availability is to add a second drive and create a data mirror, also called RAID-1. In RAID-1 the data is stored on two disks and if one fails the server continues to operate and it is possible to replace the failed one. Linux and Windows Server operating systems offer software RAID, which means that the operating system takes care of this task. For operating systems that do not have this function and/or to obtain better performance, there are PCI-E hardware controllers that perform this task and have memory and battery to obtain better disk access performance.
It is very important to take into account that if you want to use SSD (solid-state) drives with hardware RAID controllers, Datacenter (DC) class SSDs are recommended since they are optimized for this type of controller.
