Quiz 1) The storage I/O control layer processes service calls from the command l
ID: 3695437 • Letter: Q
Question
Quiz 1) The storage I/O control layer processes service calls from the command layer or application (2pts) program and issues commands to the storage I/O control layer to interact with hardware True False 2) An FMS provides command-layer functions and utility programs for users and system (2pt5) administrators to manage files, directories, and secondary storage devices. True False (2pts) 3) On larger computers such as servers, a volume can span multiple physical secondary storage devices. True False 4)A typical laptop computer has up to a few hundred storage volumes. (2pts) True False (2pts) 5) The logical view of secondary storage consists of files contained within folders and storage volumes True FalseExplanation / Answer
1. False
Explanation: File Control Layer processes service calls from command layer or application program and issuses commands to the storage I/O control layer to interact with hardware.
2. True
Explanation: An File Management System provides command-layer functions and utility programs for users and system administrators to manage files, directories, and secondary storage devices and through the command layer user performs common file management functions.
3. True
Explanation: The physical view of secondary storage is a collection of physical storage locations organised as linear address space. A typical computer has upto billions of physical secondary storage locations.
4. False
Explanation: A typical laptop computer has few dozens storage volumes.
5. True
Explanation: Users and application programs view secondary storage logically as a collection of files organised in folders and storage volumes.
6. Storage Management Systems
7. Storage I/O Control Layer
8. File Control
9. Working
10. Storage area network
11. Blocking
12. RAID:(Redundant Array of Independent Disks)
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RAID originally named as Redundant Array of Inexpensive Disks but, now it is named as Redundant Array of Independent Disks.
RAID allows you to improve overall performance in a balanced way by storing the same data redundantly.RAID disk drives are used frequently on servers.
By using RAID the data can be mirrored on more than one disks in the same way, so that if one disk fails the data is preserved in another disks, this preserving technique is known as striping. By using RAID technique you can improve the performance.
A typical RAID provide more storage capacity than a single disk by using multiple disks that appear to be a single device.
Standard RAID levels :
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Level 0: Striped disk array without fault tolerance
Level 1: Mirroring and Duplexing
Level 2: Error-correcting coding
Level 3: Bit-interleaved parity
Level 4: Dedicated parity drive
Level 5: Block interleaved distributed parity
Level 6: Independent data disks with double parity
Level 10: A strip of mirrors
Non- Standard RAID levels:
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Level 0+1,Level 7, RAID 1E, RAID S.
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