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- Description
- Specifications
The 1814-72A is the DS4700 Express Model 72, the larger-cache of the two DS4700 models. It is a 3U rack unit with dual intelligent RAID controllers and 16 bays for SATA or Fibre Channel enhanced disk drive modules. Cache is 4 GB in total, 2 GB per controller, and the host side has eight 4 Gbps Fibre Channel ports, four per controller. The Model 70 (1814-70A) halves that to 2 GB of cache and four host ports.
Each controller uses a 667 MHz xScale processor with an embedded XOR engine, and a lithium-ion battery protects the cache for at least 72 hours. The host links auto-negotiate 1, 2 or 4 Gbps, so older 2 Gbps fabrics keep working. RAID 0, 1, 3, 5, 6 and 10 are supported, with up to 128 storage partitions and a global hot spare. Premium functions are FlashCopy, VolumeCopy and Enhanced Remote Mirroring.
Capacity grows by attaching EXP810 expansion units, up to six, each with 16 bays. That takes the system to 112 drives, and FC and SATA drives can be mixed. Supported drives include 4 Gbps FC 15K RPM at up to 600 GB and 450 GB, and 4 Gbps SATA at 7,200 RPM in 500 GB, 750 GB and 1 TB. DC-powered 72-DC variants exist for -48 V telco power.
The expansion unit is the 1812-81A EXP810; companion IBM disk systems are on the IBM storage systems page.
| 1814-72A Specs | |
| Machine type-model | 1814-72A (DS4700 Express Model 72) |
| Height | 3U |
| Controllers | 2 x 4 Gbps RAID |
| Cache | 4 GB (2 GB per controller) |
| Host ports | 8 x 4 Gbps FC (1, 2, 4 Gbps auto-negotiate) |
| Drive bays | 16 (SATA or FC) |
| Processor | 667 MHz xScale per controller |
| RAID levels | 0, 1, 3, 5, 6, 10 |
| Storage partitions | up to 128 |
| Expansion | up to 6 EXP810 (112 drives) |
| Cache battery | lithium-ion, at least 72 hours |