2029370
Description
Flashcards by Manuel Eduardo Peña Pernia, updated more than 1 year ago
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Created by Manuel Eduardo Peña Pernia
about 9 years ago
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| Question | Answer |
| What are the common storage device categories? What are the different? | 1. Closed Storage System 2. Open Storage System 2.1 Built-in Storage 2.2 Attached Storage 2.2.1 DAS 2.2.2 FAS 2.2.2.1 NAS 2.2.2.2 SAN |
| What are the functions of RAID? | Redundant Array of Independent Disk, is a storage technology that combines multiple physical disks into a logical unit for improving data redundancy and performance. |
| What are the common RAID Levels? What are the technical priciples? | RAID0,1,5,10. |
| What are the advantages of Multipathing? | 1. Host that have multiple HBA´s and one virtual disk can connect to each other through multiple paths, 2. The multipathing software balances I/O loads dynamically among paths, improving the overall server performance. 3. The multipathing software test I/O paths practively and enables automatic path recovery. The multipathing software supports a high-availability cluster. |
| What is the principle of snapshot? What are the applications of snapshot? | Principle: The original disk file of the VM becomes a read-only snapshot file, and the VM is redirected to a new disk file through I/O redirection. Afterwards, the new data is written to the new disk file, and the old data is read still on the original disk file. Application: 1. can be used by administrator to save, recover, and maintain VM´s, providing rich experience for end users. 2. The feactures derived from snapshot include linked clones and non-persistent disks, wich provide custimers with multiple value-added services. |
| Raid increases the data read efficiency and also provides the data backup function (True or false) | F |
| What are the common storage device categories? a) DAS b) SAS c) NAS d) SAN | a,c,d ( creo que está mal redactada la pregunta) |
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