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ZITEL ANNOUNCES MULTI-HOST FILE SHARING FOR ITS SOLID STATE DISK (SSD) PRODUCTS

 ZITEL ANNOUNCES MULTI-HOST FILE SHARING
 FOR ITS SOLID STATE DISK (SSD) PRODUCTS
 Zitel SSD Ensures High I/O Throughput
 in a Multi-Host File Sharing Environment
 MILPITAS, Calif., Feb. 27 /PRNewswire/ -- Zitel Corp. (NASDAQ: ZITL), an innovator in solid state memory design and manufacturing, announced today the availability of Multi-Host File Sharing (MHFS) for its Unisys 1100/2200 peripheral storage products. The feature is available on several of Zitel's solid state disk (SSD) offerings, including RAMdisk/1100, RAMdisk/1122, RAMdisk/1124, Primary Storage-BMC, and Primary Storage-BMC/24.
 Zitel MHFS implementation has already begun shipping on OS1100 sites around the world. Pricing for the MHFS feature is available from Zitel representatives, and is dependent on subsystem configuration.
 MHFS Allows Multiple Processors to Share Data
 In today's Unisys-based data processing system, a single mainframe computer typically is supported by one peripheral storage "farm". Though the farm may include several disk subsystems, there is only one system issuing I/O (input/output) requests to the various subsystems. Increasingly, however, there are more complex configurations in which multiple processors access data in the single storage farm. Data is shared at the file level and in some cases at the record level.
 Access to the data must be restricted to one processor at a time. Without such control, one host processor might over-write a record previously accessed by another host processor, resulting in costly data corruption. MHFS protects the system's data, while allowing shared access among multiple host processors.
 Zitel SSD Now Delivers Top I/O Performance
 in Multi-Host Environments
 MHFS and cache disk subsystems are incompatible. Cache does not have the ability to lock data during access. This limitation creates a serious problem for sites which require multiple, closely coupled processors -- and which also require high speed I/O performance.
 Zitel's SSD with MHFS capability now provides a solution for such sites. In recent benchmark tests on the Unisys Gladiator Test Bed in Roseville, Calif., Zitel's SSD demonstrated that it could deliver sub- millisecond service times at 900 I/Os/second. At the heaviest workload ("PASS," or 1600 I/Os/second), Zitel's SSD still delivered a 1.2 millisecond RET (request existence time); this was 20 times faster than the average service time for M9720 disk.
 According to John Valentine, Zitel end user product marketing manager, "When OS1100 users want to implement a multi-host system, they face the problem of degraded I/O performance, since cache must be removed from the disks. Zitel's SSD with MHFS solves this problem. It enables OS1100 users to sustain or improve I/O performance in a multi-host system, with full assurance that data integrity is protected."
 Zitel Corp. is a publicly held designer and manufacturer of advanced solid state memory systems for both OEMs (original equipment manufacturers) and business end users. Zitel's end-user product lines focus on the Unisys mainframe market. The company is headquartered at 630 Alder Dr., Milpitas, Calif. 95035, and has offices across the United States, in London, England and in Paris, France. Telephone: 408-946-9600. FAX: 408-262-6754.
 -0- 2/27/92
 /CONTACT: Ted E. Buxton or John Valentine of Zitel Corp., 800-622-5020 (outside Calif.) or 408-946-9600 (in Calif.).
 (ZITL) CO: Zitel Corp. ST: California IN: CPR SU: PDT


DG -- SJ002 -- 3077 02/27/92 08:02 EST
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Publication:PR Newswire
Date:Feb 27, 1992
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