The term "entry-level," while accurate in the sense that it is IBM's low-end line in terms of capacity, performance and functionality, is also a little misleading, as IBM's DS3000 solutions offer capacity, performance, and functionality that would have been available only in much higher-end products only a few years ago. Those new functions and features are important as midrange companies need to keep up with the same explosive data growth that has affected the largest companies.
The just-announced DS3500 is not intended to immediately replace existing DS3200, DS3300 and DS3400 models as each has its separate niche. Apart from that, the news is that IBM is emphasizing the continuing growth of SAS. Compared to Fibre Channel, changes in SAS are more evolutionary than revolutionary. The DS3500 Express doubles the capacity and performance of any previous product in the DS3000 family; for example, enabling the use of up to 96 drives instead of 48 drives.
The DS3500 Express does offer multi-protocol support however, that gives it great flexibility for use as a DAS (Direct Attached Storage) solution or a SAN environment or both concurrently. The DS3500 Express features a starting point of four 6Gbps SAS ports, as well as 8Gb FC and 1Gb iSCSI, which enables it to provide higher throughput performance than previous models in the DS3000 family.
In addition to the hardware platform, IBM's Tivoli Storage Productivity Center Midrange Edition (TPC for Disk MRE) is now the management platform for all of its midrange products. This offers the same features and functions as the enterprise version of TPC for Disk, which provides storage resource management capabilities for managing storage infrastructures from a single console.
Frankly, no midrange storage array customer should be without TPC for Disk MRE or its equivalent for a number of reasons. These include the ability to provide performance, device configuration and SAN topology reporting across all midrange arrays, as well as improving SAN availability through real-time monitoring and fault identification. Additionally, enabling event-based actions isbased upon threshold policies after receiving alerts.
The basic difference between the enterprise edition and midrange edition of TPC for Disk is price. In most situations, the cost of TPC for Disk MRE is less than half, and in some cases much lower than that, of the enterprise edition. Pricing is based upon the number of storage devices--such as enclosures, not disks themselves--that are used rather than the total number of TBs. The list price for a software license for each storage device is $8099, which doesn't sound inexpensive, but it is all relative.
Moreover, although TPC for Disk MRE is not exclusive to the DS3500 Express, it could also stimulate hardware sales, as well. The reason is simple. The customer might find the DS3500 Express very attractive in terms of features and functions but might also need the equivalent of a TPC for Disk MRE to achieve SRM for what it might consider a large configuration. The enterprise edition price might exceed the price a customer had in mind for SRM software for a particular hardware configuration, taking into account the percentage of the software cost as a percentage of the hardware cost. Conceivably, that could be a deal breaker for the hardware as the software is also needed. The TPC for Disk MRE price has a better chance of being acceptable and therefore could improve the acceptability of the DS3500 Express.