The SCSI Drive Cables(Comptia Objective 3.1) Flashcards
1
Q
Why was the SCSI standard originally created?
A
- Designed to connect many peripherals together on a single cable/ controller
- Up to 16 devices could be connected in a single chain( Bus)
- Many different versions( Fast SCSI Ultra SCSI, SAS etc)
2
Q
How can SCSI drive cables be connected?
A
- Can be connected over serial or Parallel type connections.
3
Q
What are some SCSI advantages?
A
- Has many uses. Not just for hard drives. Could be used for scanners, tape drives, CD rom drives etc
- Very little configuration required. Most of the work is done between the SCSI devices which are connected together in a daisy chain like fashion. Intelligent connection
- Industry longevity well supported in the enterprise
- Can still be found being used in virtual machines.
4
Q
What must you do when you connect a device onto a legacy SCSI bus?
A
- You must assign each individual device a separate ID number.
- E.G : “ SCSI ID 0( SCSI Controller) , ID 2( Hard drive) , ID 3( CD-ROM)
- If using something like a Drive array( RAID) Logical units (LUNS) may also be used to identify seperate drives with in an array( Which has been assigned an ID#)
5
Q
How would you signify the end of a SCSI bus?
A
- You would use a Terminator.
- Can be internal to the device or a separate termination device.
6
Q
What is the newer non parallel format of SCSI that doesn’t require termination points, jumpers, ID#s or LUNs ID#s?
A
- Serial Attached SCSI( SAS)
7
Q
What are some benefits of Serial Attached SCSI(SAS)
A
- Increased throughput/ higher speed due to the serial type connection
- Similar to the move from PATA to SATA
- Adds flexibility to connecting devices in our enterprise.
- Uses point to point connections no more daisy chaining devices together. You have the host device on one side of the connection and a storage device on the other.
- No termination is required the bus has two devices on it.
