Here's some info from their website: https://www.kaleidescape.com/faq/#cat_02n500000004tGwAAIThat's good (actually very good) food for thought. Maybe I would buy the zero storage Strato and some amount of Terra storage. Thanks. But that stuff is really expensive.
Q: What technology does a Premiere system use to ensure reliable storage? A: Kaleidescape servers in the Premiere line are specifically designed and monitored to provide reliable storage. Kaleidescape uses a variety of hardware, software, and service technologies to ensure reliable operation of the system in the event of a drive failure. Kaleidescape developed a proprietary storage technology, RAID-K, customized for the reliable storage of movies and music on multiple disk cartridges. With RAID-K, the system continues to play movies and music even if a drive fails. Like other common fault-tolerant technologies for multiple disk drives, no data is lost if one drive fails. Unlike other technologies, RAID-K is customized for movie servers; each movie or music album is generally stored on one drive for optimal performance and additional disk cartridges (of different storage capacities) can be added later to generally increase storage.
After a drive failure, the failed disk cartridge must be replaced to restore the system to normal functionality and reliability in the unlikely case of a second drive failure. The 3U Server includes the additional feature of a hot spare disk cartridge, which is available immediately to replace a failed drive.
Kaleidescape also provides real-time services, over the Internet, to monitor the health of drives in a server. If a component is too hot, or if a drive fails certain software tests, we may proactively alert the dealer-of-record that service is required.
What happens in the event of a hard disk drive failure? Premiere Line
Although Kaleidescape uses high quality hard disk drives, occasionally, drives do fail. On average, drives in Kaleidescape Systems fail at a rate of one or two percent per year. To prevent loss of information from a drive failure, every Kaleidescape server in the Premiere line uses RAID-K to store parity information. In addition, the 3U Server features a hot spare disk cartridge as an added measure of data protection.
If a disk drive fails, the disk cartridge indicator light changes from blue to amber (or does not light up at all) and an email alert is sent to the dealer and the end user (if set up to receive them). Email alerts are maintained on the Extranet by the dealer of record. If no dealer of record exists, Kaleidescape Support can update the email alerts.
When a disk drive fails in a 3U Server with a hot spare disk cartridge, a rebuild begins automatically. The server remains blue and movies and music in your library can continue to be enjoyed, however new content cannot be added until the rebuild completes. The server is vulnerable to losing data should another drive fail, but only until the rebuild completes.
When a disk fails in a 1U Server, 5U Server, 3U Server without a hot spare, or a Cinema One (1st generation), a message is displayed in the onscreen display saying, “A disk cartridge on your Kaleidescape System is missing or has failed. Please have your Kaleidescape System serviced as soon as possible to avoid having to re-import your movies and music.” A similar message appears in the browser interface. The server turns amber and the movies and music in your library can continue to be enjoyed, however new content cannot be added to your library. After 10 days, the Kaleidescape System stops operating until the failed disk cartridge is replaced. It is very important to replace a failed disk drive as soon as possible when a server is in this state. The server is vulnerable to losing data should another drive fail. When the disk cartridge is replaced, the information on the failed disk drive is automatically rebuilt onto the new disk cartridge.
Disk cartridges can be replaced easily by the customer or the dealer while the system is operating.