IS 451 (Exam 3) Study Cards
1. What is RAID (Redundant Array of Independent DIsks)?: - puts multiple phys- ical disks into logical grouping
- designed for fault tolerance and performance improvement
- implemented in hardware and software
- multiple levels
2. What is Hardware RAID?: - volume management performed by RAID controller (on the disk)
- parity computation performed by the RAID controller
- dedicated cache memory improves server performance
3. What is Software RAID?: - performed by the server's OS
- parity computation performed by the server
-RAID performance depends on the server performance and CPU load
- for simple environments w/ lower performance and availability requirements
4. Raid 0: striping; NO FAULT TOLERANCE
5. RAID 1: mirrored volumes
6. RAID 2: Bit-level striping with parity distributed to one or more disks
7. RAID 3: Byte-level striping with dedicated parity disk
8. RAID 4: Block-level striping with dedicated parity disk
9. RAID 5: Block-level striping with distributed parity
10.RAID 6: Block-level striping with distributed double parity
11.What is block-level access?: it refers to access to specific blocks of data (is a read/write realtionship)
12.What is file-level access?: refers to access to files that contain several blocks of data (is a client/server
relationship)
13.What is Direct Attached Storage (DAS)?: It is computer storage that is con- nected to one computer and not
accessible to other computers. This can be some- thing such as a hard drive or solid state drive. Individual disk drives in
a server are also called DAS.
14.What is Network Attached Storage (NAS)?: - It is a dedicated file storage that enables multiple users to retrieve
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, IS 451 (Exam 3) Study Cards
data from centralized disk capacity. Users on a LAN access the shared storage via a Ethernet connection.
- File-level access from the outside, and Block-level access on the storage subsys- tem
- file system is on the NAS device
15.What is Storage Area Network (SAN)?: - It is a dedicated high-speed network or sub-network that interconnects
and presents shared pools of storage devices to multiple servers
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15
1. What is RAID (Redundant Array of Independent DIsks)?: - puts multiple phys- ical disks into logical grouping
- designed for fault tolerance and performance improvement
- implemented in hardware and software
- multiple levels
2. What is Hardware RAID?: - volume management performed by RAID controller (on the disk)
- parity computation performed by the RAID controller
- dedicated cache memory improves server performance
3. What is Software RAID?: - performed by the server's OS
- parity computation performed by the server
-RAID performance depends on the server performance and CPU load
- for simple environments w/ lower performance and availability requirements
4. Raid 0: striping; NO FAULT TOLERANCE
5. RAID 1: mirrored volumes
6. RAID 2: Bit-level striping with parity distributed to one or more disks
7. RAID 3: Byte-level striping with dedicated parity disk
8. RAID 4: Block-level striping with dedicated parity disk
9. RAID 5: Block-level striping with distributed parity
10.RAID 6: Block-level striping with distributed double parity
11.What is block-level access?: it refers to access to specific blocks of data (is a read/write realtionship)
12.What is file-level access?: refers to access to files that contain several blocks of data (is a client/server
relationship)
13.What is Direct Attached Storage (DAS)?: It is computer storage that is con- nected to one computer and not
accessible to other computers. This can be some- thing such as a hard drive or solid state drive. Individual disk drives in
a server are also called DAS.
14.What is Network Attached Storage (NAS)?: - It is a dedicated file storage that enables multiple users to retrieve
1/
15
, IS 451 (Exam 3) Study Cards
data from centralized disk capacity. Users on a LAN access the shared storage via a Ethernet connection.
- File-level access from the outside, and Block-level access on the storage subsys- tem
- file system is on the NAS device
15.What is Storage Area Network (SAN)?: - It is a dedicated high-speed network or sub-network that interconnects
and presents shared pools of storage devices to multiple servers
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15
