| 1: | List four types of connecting technologies used in storage subsystems. |
| A1: | Answer: DASbus, Fibre Channel loop, system I/O bus, and switched connections |
| 2: | Name two types of device redundancy. |
| A2: | Answer: Mirroring and parity RAID |
| 3: | True or false: Disk drives can have only a single connecting port. |
| A3: | Answer: False. Fibre Channel drives are dual-ported and SATA, and SAS drives are expected to implement dual porting also. |
| 4: | How is battery backup used in a subsystem? |
| A4: | Answer: It keeps power to volatile cache memory. |
| 5: | True or false: Temperature is never a problem for disk subsystems. |
| A5: | Answer: False. Temperature should always be monitored. |
| 6: | What form of device redundancy does not increase capacity? |
| A6: | Answer: Mirroring is a form of device redundancy that does not increase capacity. |
| 7: | Name two ways in which performance can be boosted in disk subsystems. |
| A7: | Answer: Parallelism (overlapped I/Os) and caching |
| 8: | What is the difference between hot swapping and hot sparing? |
| A8: | Answer: Hot swapping allows devices to be removed and inserted into a system without turning off the system. Hot sparing keeps a spare device available to be inserted in subsystem operations without having to remove and replace a device. |
| 9: | Explain the difference between a subsystem and an array. |
| A9: | Answer: An array is a logical construct, and a subsystem is a physical collection of different components. |
| 10: | True or false: LUN masking blocks I/Os. |
| A10: | Answer: False. It hides devices by not responding to initiator inquiries. |