Adaptec AAA-130U2 Installation And Hardware Manual

Contents

Adaptec AAA-130U2 Installation And Hardware Manual Manual pdf 23 page image

2-9Installing the HardwareConnecting SCSI DevicesThe AAA-131U2/133U2 supports both internal and external SCSIdevices. Each channel supports up to 15 SCSI devices—Ultra2 SCSIdevices alone or a combination of Ultra2 and Ultra SCSI devices.Using Adaptec SpeedFlex ™ technology, the 50-pin narrow connectoron Channel A supports up to seven Fast/Narrow SCSI deviceswithout affecting the performance of Ultra2 devices connected toChannel A internal and external Ultra2 connectors. Before connect-ing devices to the AAA-131U2/133U2, be sure to also review SettingUp SCSI Devices on page 2-6.Note: We recommend keeping Ultra2 devices on separatechannels from non-Ultra2 devices. Peak transfer rates onUltra2 channels are 80 MBytes/sec. Connecting a non-Ultra2 device to an Ultra2 SCSI channel limits the entirechannel to lower performance levels (up to 40 MBytes/sec).If you have internal SCSI devices, mount each device in an availabledrive bay inside your computer, as shown in Figure 2-6. Refer toyour computer and device documentation for instructions on install-ing devices inside your computer.Note: If you are installing your SCSI devices inside anexternal array enclosure, see External SCSI Array Enclosures(Storage Subsystems) on page 2-18.Figure 2-6. Internal SCSI Device Mounted in Drive Bay Inside Your ComputerInternal SCSI Device