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ADVANCED 9337 DISK ARRAY SUBSYSTEM OFFERS AS/400 CUSTOMERS HIGH-AVAILABILITY, COST-EFFECTIVE STORAGE

 ADVANCED 9337 DISK ARRAY SUBSYSTEM OFFERS AS/400 CUSTOMERS
 HIGH-AVAILABILITY, COST-EFFECTIVE STORAGE
 WHITE PLAINS, N.Y., Sept. 1 /PRNewswire/ -- IBM today announced the 9337 Disk Array Subsystem, an advanced data storage unit that gives Application System/400 (See Note) (AS/400 --See Note--) customers uninterrupted access to essential business information should a disk drive or power supply fail.
 The new storage subsystem uses an implementation of the storage technique called RAID-5, or Redundant Arrays of Independent Disks, and significantly expands the AS/400's data storage and availability options.
 For businesses that depend on continuous access to information -- such as insurance and retail companies -- the 9337 offers an attractive alternative to availability features currently offered on the AS/400. It is less expensive than mirroring or duplicating data and provides quick data recovery with little impact on system resources.
 IBM expects to be the first in the industry to ship in volume a RAID-5 storage subsystem for the AS/400.
 "The 9337 is a bright new offering in the spectrum of AS/400 storage products," said IBM Vice President Ray S. AbuZayyad, general manager of ADSTAR, IBM's storage business unit.
 "The work of the ADSTAR and AS/400 development teams has resulted in a product with an innovative RAID-5 implementation designed specifically to meet the needs of our AS/400 commercial customers."
 The 9337 is a rack-mounted disk array subsystem using IBM's high- performance, high-capacity 3.5-inch disk drives with magnetoresistive head technology. The subsystem comes in four models -- two high- availability and two base -- that attach to the AS/400 9406 D and E models. All 9337 models are offered with a two-year warranty, twice that of current AS/400 disk storage devices.
 IBM has used the latest technologies in the 9337 subsystem to increase reliability and data availability while lowering the price per megabyte (MB) for all models. The 9337 base models cost up to 25 percent less than the 9336 Disk Unit, the predecessor storage subsystem for the AS/400, and can cost customers 35 percent less over five years.
 The 9337 high-availability models cost approximately $10 per megabyte -- approximately half the cost of disk mirroring.
 All models have a redundant power supply that gives customers an additional measure of availability. If one of the three power supplies fails, the remaining two can supply 100 percent of the power needed to run the 9337. In addition, a new storage controller has RISC (Reduced Instruction Set Computing) semiconductor technology and a unique buffer architecture that improves subsystem performance and allows more efficient processing.
 Any of the new models can be combined with other AS/400 storage subsystems -- such as the 9336, 9335 and 9332 -- to protect customers' existing investments.
 Models for High Data Availability.
 The Model 110 and 120 high-availability disk arrays are available with four to seven disk drives and provide up to 5.82 gigabytes (GB), or 5.82 billion bytes, of high-availability storage. Customers can choose either 542MB drives (Model 110) or 970MB drives (Model 120). Multiple arrays can be combined in a single AS/400 storage rack with a capacity of up to 35GB.
 These models use an implementation of the RAID-5 technique that IBM designed especially for the AS/400. In the 9337 subsystem, parity -- the data's mathematical sum -- is distributed across several disk drives. If a disk drive fails, the 9337 uses an algorithm to reconstruct the missing data immediately from the parity and data on the remaining drives.
 The 9337 continues to operate, and customers can continue to access and update information, while the drive is disabled and being replaced. Once a new drive is in place, the 9337 automatically restores the data.
 IBM is introducing several innovations with this RAID-5 technique that will improve its usefulness in the AS/400's commercial on-line transaction-processing environment. For customers, these IBM exclusives complement the AS/400's single-level storage architecture, provide additional data protection and improve system performance.
 First, in the 9337's implementation, parity is distributed across the first four disk drives only, making it easier and less time- consuming for customers to add disk drives and storage capacity to the 9337.
 Also, the impact of the RAID-5 technique on performance has been reduced. With traditional RAID-5, four read/write operations -- called the "write-penalty" -- must be performed every time data are added or updated. The 9337 uses an eighth drive, or Write-Assist Drive (WAD), to overcome the write-penalty while still protecting data.
 Base Models
 The 9337 base Models 010 and 020 are available with two to seven disk drives and provide up to 6.79GB of storage in a single disk array. As with the high-availability models, customers can choose 542MB drives (Model 010) or 970MB drives (Model 020).
 The base models' maximum capacity of 40.8GB per rack is twice the capacity of a single-rack of 9336s, making these products attractive for customers in need of high-capacity storage in a relatively small amount of space.
 Both base models can be upgraded to high-availability models at the customer location.
 In a Statement of Direction, IBM said it intends to attach 9337s to AS/400 9406 B models in the first half of 1993.
 General Availability
 General availability of the 9337 base models is planned for Sept. 25. General availability of the high-availability models is planned for Nov. 13.
 NOTE: Trademark or registered trademark of International Business Machines Corporation (NYSE: IBM).
 -0- 9/1/92
 /CONTACT: Pam Olson of IBM, 212-230-5499 on Sept. 1, or 914-642-5553 (after Sept. 1)/
 (IBM) CO: IBM Corporation ST: New York IN: CPR SU:


SH -- NY027 -- 5340 09/01/92 10:30 EDT
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