Dual Disc Mirror
The definitive end of data-lossUntil recently, adequate data-protection was complex, time-consuming and expensive. The Dual Disc Mirrors of Twincom change that.
They rule out data loss, while the system continues to operate.
Revolutionary operationsEvery write command to the external disk memory is simultaneously written to the second of a pair of disks (DUAL WRITE).
If one disk becomes inoperative due to a head-crash or a breakdown, the other disk of the pair automatically takes over operations without any production loss (HOT STANDBY).
The Dual Disc Mirror (DDM) program has been developed as an extension of the UNIX operating system. The DDM programs are fully transparent for the application systems (FULL TRANSPARENCY).
Obvious advantagesThe idea behind the Dual Disc Mirror: maximum safety through the use of two identical disks in a pair and an uninterruptable power supply (UPS).
The Dual Disc Mirror operates independently of the application software. In the event of a head-crash on one of the disks of a pair, the other disk takes over operations.
The defective disk itself can be replaced without loss of production. With minimal loss of production time during:
Remarkable optionsAfter the "Mirror" is activated, the second disk is automatically synchronized. There is no need to make a time-consuming copy (ON-LINE SYNCHRONIZATION).
The user is continuously informed about the status of the mirrored disk pairs. The status can be printed, displayed and/or reported via datacom (MIRROR STATUS REPORTS).
Problem-free installationDual Disc Mirrors (DDM) of Twincom can run on many systems that work with UNIX.
Requirements: the DDM software, pair(s) of hard disks, UPS (optional), a back-up device (optional), and the Twincom installation support-manual.
Impressions of users
Federal Express, GermanyOnline network of 15 minicomputers, supporting a country-wide distribution system for frozen food. "They simply never failed!"
Union Bank of Switzerland, ZurichThree data centers perform a part of the data-processing of one of the two largest banks in Switzerland. "The performance and the ease of use are spectacular!"
Motorola Communications, USAA computergrid of 1200 microcomputers over the USA, with central co-ordination via satellite-links, performs the tasks of communication and co-ordination of trucking systems in the USA. "Our Twincom solution has a stunning economy!"
PharmaPartners, The NetherlandsOnline medication surveillance and prescription processing system "Pharmacom" for more than 4 million Dutch citizens. "The UNIX Disc Mirror offers extreme uptimes and guarantees optimal file integrity!
UNIX is a trademark of AT&T Bell Laboratories.