IBM Storage

Models: 1726-21X—single controller/1726-22X—dual controller

RAID controller: Dual active
Cache per controller: 512 MB battery-backed cache with 1 GB upgrade option
Host interface: One or three host ports per controller, Serial Attached SCSI (SAS) 3 Gbps
Drive interface: Serial Attached SCSI (SAS)
Supported drives: 3 Gbps SAS / 6 Gbps SAS / 3 Gbps SATA
RAID levels: RAID-0, -1, -3, -5, -6, -10
Storage partitions :4, 8, 16, 32
Maximum drives supported: 48 drives (utilizing three EXP3000 Expansion Units)
Rack support: 19" industry-standard rack
Warranty: Three-year parts and labor
Size: 8.7x55.0x44.7(cm)

Models:1726-31X—single controller/1726-32X—dual controller  

RAID controller:Dual active   
Cache per controller:512 MB battery-backed cache with 1 GB upgrade option
Host interface:Two host ports per controller, 1 Gbps iSCSI
Drive interface:Serial Attached SCSI (SAS)
Supported drives:3 Gbps SAS / 6 Gbps SAS / 3 Gbps SATA
RAID levels:RAID 0, 1, 3, 5, 6, 10   
Storage partitions:4, 8, 16, 32   
Rack support:19" industry-standard rack
Warranty:Three-year parts and labor   
Size:8.7x55.0x44.7(cm)
Weight: approximately 17.2 kg (38.0 lb) for a standard unit; when fully configured, 29.2 kg (64.5 lb)

Model: System Storage DS3512 (1746A2S)

RAID controller: Dual active
Cache per controller: 512 MB battery-backed cache with 1 GB upgrade option
Host interface: Two host ports per controller, Fibre Channel (FC) 4 Gbps auto-sensing 1 Gbps/2 Gbps
Drive interface: Serial Attached SCSI (SAS)
Supported drives: 3 Gbps SAS / 6 Gbps SAS / 3 Gbps SATA
RAID levels: RAID 0, -1, -3, -5, -6, -10
Storage partitions: 4, 8, 16, 32
Maximum drives supported: 48 SAS or SATA drives (using three EXP3000 Expansion Units)
Rack support: 19" industry-standard rack
SAN support: IBM supported FC switches
Warranty: Three-year parts and labor warranty

Models:System Storage DS3500( 1746A2S / 1746A2D)

RAID controller:Dual Active, hot-swappable controllers
Cache per controller: 1 GB with 2GB upgrade (battery-backed)
Drive interface: Two 6Gigabit (Gb) SAS drive ports
Supported drives: 6Gbps SAS 3.5" / 1TeraByte (TB) 7.2krpm NL, 2TB 7.2krpm NL / 600GB 15krpm SED
RAID levels: 0, 1, 3, 5, 6, 10
Storage partitions:  up to 64 storage partitions (levels: 4 standard with upgrades to 8, 16, 32, 64)
Maximum drives supported: Up to 96 drives - high performance SAS drives, NL SAS drives and SED SAS drives
Rack support: 2U, 19-inch, industry-standard rack
Warranty: Three-year parts and labour
Size: Height: 3.39" x 18.99" x 21.72"

Model: System Storage DS3512 (1746A2S)

RAID Controller: Single Controller
Supported Drives: 1 x 6Gb SAS HBA Controller (46M0907) / 1 x 3m SAS cable (39R6531) / 300GB 3.5" SAS 15k Hard Drive (49Y1856) / DS3512 EXP3512 Expansion Unit for additional drives (1746A2E)
DS3500 Partition Expansion Licence - expands partitions from 4 to 16 (68Y8437)
DS3500 SAS controller upgrade: upgrades Single Controller to Dual Controller model (68Y8479)
Warranty: ELD Support Line 3 Yr 24x7 (71Y2302)

Model: System Storage DS3512 (1746A2D)

RAID Controller: Dual Controller
Supported Drives: 2 x 6Gb SAS HBA Controller (46M0907) / 2 x 3m SAS cable (39R6531) / DS3500 2GB cache memory upgrade 2 x (68Y8434) / 6Gb SAS 2 port card 2 x (68Y8431) for Dual Contoller / 8Gb FC 4 port card 2 x (68Y8432) for Dual controller / 2TB 3.5" NL SAS 7.2k Hard Drive (49Y1871) / 600GB 3.5" SAS 15k Hard Drive (49Y1866)
Warranty: ELD Support Line 3 Yr 24x7 (71Y2302)