cat /proc/scsi/scsi
Attached devices:
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: IBM Model: AuSaV1S2 Rev: 0
Type: Processor ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 01 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Direct-Access ANSI SCSI revision: 02
Host: scsi2 Channel: 00 Id: 02 Lun: 00
Vendor: IBM Model: SERVERAID Rev: 1.00
Type: Processor ANSI SCSI revision: 02
Host: scsi2 Channel: 01 Id: 03 Lun: 00
Vendor: IBM Model: AuSbV1S2 Rev: 0
Type: Processor ANSI SCSI revision: 02
Where Id is the number of the disk, the largest one is the number of blocks, such as 3, then four disks
See Vendor and Model below for the model of the disc