A+ 1001 (3): Hardware: RAID Study

RAID 10 (1+0)

*Combines the advantages of RAID 1 and RAID 0. *Requires minimum of 2 disks but will usually have 4+ *The system contains at least 2 mirrored disks that are then striped *IS fault tolerant

RAID 1 Mirroring

*Data is copied to two identical disks. If one disk fails, the other continues to operate. *IS fault tolerant *2 (and 2 only) minimum disks

RAID 5 Striping with Parity

*Data is striped across multiple disks *Fault tolerant parity data is also written to each disk *If one disk fails, the array can reconstruct the data from the parity information *IS fault tolerant *Minimum 3 disks

D. Hard Drive

A client has a workstation with a RAID 5 configuration and reports that slower than normal performance occurs when reading/writing files to the RAID. You run a diagnostic program against the RAID, and the system passes all of the diagnostic tests without any issues. While you are running the tests, though, you head clicking noises coming from the RAID. Which of the following is the MOST likely cause of the slow performance being experienced by the client? A. RAID controller B. SSD C. Cooling Fan D. Hard drive

B.

A server administrator has been asked to configure the storage requirements for a new database server. The database owner requires the fastest performance, and redundancy if a single drive fails. The storage array should support 8 TB or larger of available space. Which of the following options would be the BEST choice? A. RAID 10 with 5,400 RPM, 8 TB drives B. RAID 5 with 10,000 RPM, 5 TB drives C. RAID 1 with 7,200 RPM, 8 TB drives D. RAID 0 with 15,000 RPM, 5 TB drives

C

A server administrator has configured a database server with a RAID 0 array containing four hard drives. An error notification from the RAID controller states that disk 3 has failed. Which of the following would be the BEST way to address this disk failure? A. Replace the drive and re-mirror the array B. Replace the drive and resynchronize the array C. Replace the drive and restore from backup D. Replace all drives and restore from backup E. Replace all drives and resynchronize the array

A. RAID 5

A server administrator has four identical drives to install into a database server. Which of these RAID types would provide both redundancy and the most available storage space? A. RAID 5 B. RAID 10 C. RAID 0 D. RAID 1

A

A server administrator has received an alert showing that one drive in a RAID 1 array has failed. Which of the following would be the best way to resolve this alert? A. Replace the bad drive and resync the array B. Replace all drives in the array and resync the array C. Replace the bad drive and restore from backup D. Convert the array to RAID 0 and replace the drive E. Replace all drives in the array and restore from backup

C. RAID 0

A server administrator is building a web server with three hard disk drives. The storage for the server requires the fastest possible access and redundancy is not a primary requirement. Which of the following would be the BEST choice for this server? A. RAID 10 B. RAID 1 C. RAID 0 D. RAID 5

B. RAID 1

A technician has two hard disk drives that need to be configured redundantly, and all information should be duplicated across physical drives. Which of the following should be configured? A. RAID 5 B. RAID 1 C. RAID 10 D. RAID 0

RAID (redundant array of independent disks)

A way of storing the same data in different places on multiple hard disks or solid-state drives to protect data in the case of a drive failure.

D. Replace disk 1 and rebuild the array

A web server administrator has received a notification that disk 1 in a RAID 5 array has failed. Which of the following would be the BEST next step to resolve this drive failure? A. Replace disk 1 and restore from backup B. Replace all drives and restore from backup C. Replace all drives and rebuild the array D. Replace disk 1 and rebuild the array

D. RAID 10

An engineering firm is upgrading their storage array to include additional drive space for documents and designs. The primary goal is to provide high performance and uptime, even if two drives were to fail. Which of the following would be the BEST choice for this firm? A. RAID 1 B. RAID 5 C. RAID 0 D. RAID 10

hot-swappable

Any hardware that may be attached to or removed from a PC without interrupting the PC's normal processing.

A. RAID 10

Dion Training has asked you to consult on the installation of their new file server. The current server consists of a RAID 5 array with three 1 TB 7200 RPM hard disk drives. Due to increase reliance on the new file server, you have been asked to recommend a RAID solution that will help ensure there is no unscheduled downtime, no data loss, and increase speed/performance over the current file server. Based on these requirements, which of the following RAID solutions should you recommend? A. RAID 10 B. RAID 5 C. RAID 0 D. RAID 1

AHCI (Advanced Host Controller Interface)

IF your RAID functionality is built into the motherboard then in order to configure a RAID array, you first have to enable RAID in the BIOS. This is done by accessing the SATA configuration screen and changing from _________ to RAID.

AHCI

If someone was to reset the BIOS to defaults or flash update the BIOS, then that SATA setting would revert to ______ , rendering the RAID array useless and non-bootable—ultimately leading to various error messages.

D

On your server, two drives of a RAID 5 array have failed. What should you do? A. Replace one of the drives and run RAID repair. B. Replace the failed drives and format the RAID array using the quick option. C. Replace one of the failed drives and repair the RAID array using system utilities. D. Replace the failed drives and restore the data from tape backup to the repaired RAID array.

Fault Tolerance

The ability for a RAID system to respond to unexpected failures or system crashes as the backup system immediately and automatically takes over with no loss of service.

Fault Tolerance

The ability of your RAID array to continue to function (with little or no downtime) even if there is a problem with one of the drives.

AHCI (Advanced Host Controller Interface)

The default setting for SATA drives in many BIOS programs.

True

True of False?: Hardware-based RAID are set up through 1. Mobo's built-in RAID support if present 2. a RAID adapter card 3. an external device such as NAS with RAID capability.

False

True or False: Data may be recovered after a drive failure in a RAID 0 configuration.

True

True or False?: A RAID can be set up through either software or hardware?

True

True or False?: IF your RAID functionality is built into the motherboard then in order to configure a RAID array, you first have to enable RAID in the BIOS.

True

True or False?: In a RAID 5 array, if more than one drive fails you need to restore all data from a previous backup.

False

True or False?: In a RAID 5 array, two drives can fail and you can still recover from the issue without tape backup (using the RAID parity information).

True

True or False?: RAID are most commonly set up through hardware.

False

True or False?: RAID are most commonly set up through software.

True

True or False?: To increase read performance you can use RAID 0 and 5

False

True or False?: To increase read performance you can use RAID 1 and 10.

A, C and D

Which RAID arrays can be used to enable protection from data loss? A. 10 B. 0 C. 1 D. 5

RAID 10

Which RAID is described as follows?: Combines the advantages of RAID 1 and RAID 0. Requires a minimum of two disks but will usually have four or more. The system contains at least two mirrored disks that are then striped. IS fault tolerant. Requires a minimum of 4 disks.

RAID 1

Which RAID is described as follows?: Mirroring. Data is copied to two identical disks. If one disk fails, the other continues to operate. When each disk is connected to a separate controller, this is known as disk duplexing. IS fault tolerant. Requires 2 and only 2 disks.

RAID 5

Which RAID is described as follows?: Striping with parity. Data is striped across multiple disks; fault-tolerant parity data is also written to each disk. If one disk fails, the array can reconstruct the data from the parity information. IS fault tolerant. Requires a minimum of 3 disks.

RAID 0

Which RAID is described as follows?: Striping. Data is striped across multiple disks in an effort to increase performance. No fault tolerance. Requires a minimum of 2 disks

RAID 0

Which RAID uses striping and does not use a mirror or parity disk? This means corrupted data cannot be recovered and that an issue on one disk could cause information on other disks to be unreadable.

C. RAID 5

Which level of RAID stripes data and parity across three or more disks? A. RAID 0 B. RAID 1 C. RAID 5 D. Striping E. RAID 10

D. RAID 10

You are configuring a new server for a client. The client has purchased five 1 TB hard drives and would like the server's storage system to provide redundancy and double fault tolerance. Which of the following configurations would BEST meet the client's requirements? A. RAID 1 B. RAID 5 C. RAID 0 D. RAID 10

B

You are responding to a server issue reported to you by the accounting department. A particular mapped network drive has high latency. When you go to the server room, you identify the problem as one of the drives in a RAID array. Which of the following best describes how to fix the problem? A. You should reseat the faulty drive. B. You should replace the faulty drive. C. You should reinstall the RAID driver. D. You should replace the RAID controller.

B. When the BIOS was updated, the SATA setting in the BIOS probably reverted to AHCI. That caused the RAID 0 array to be ignored, and so the OS would not boot, because it is stored on that array. on.

You are troubleshooting a Windows Server that normally boots from an SATA-based RAID 0 array. The message you receive is "missing operating system." As it turns out, another technician has been updating the BIOS on several of the servers in your organization, including this one. What configured setting needs to be changed? (Select the best answer.) A. RAID 1 B. AHCI C. S.M.A.R.T. D. NVMe

B

You need to describe RAID to a nontechnical customer. Which of the following represents the best way describe RAID? A. RAID stands for Redundant Array of Independent Disks. B. RAID utilizes multiple disks to increase performance and/or enable protection from data loss. C. RAID is a dynamic disk management system. D. RAID uses striping to reduce the amount of hard drive write time and utilizes parity bits to reconstruct the data from a failed hard drive.

B.

Your company's file server is using a RAID 5 configuration. You just received an alert from the server that states that "RAID is degraded" and that the "Local Disk 0, Physical Disk 3 has failed". Which of the following is the BEST way to fix this error? A. Format logical disk 0, manually configure a new RAID using the remaining good drives from the RAID 5, and confirm that the RAID is no longer reporting itself as degraded. B. Schedule an authorized downtime period, replace physical disk 3, rebuild the array, and confirm that the RAID is no longer reporting itself as degraded. C. Replace physical disk 3 immediately, rebuild the array, and confirm that the RAID is no longer reporting itself as degraded. D. Reconfigure the RAID 5 to a RAID 0 in order to avoid any downtime, then rebuild the array during the next authorized maintenance period, and confirm that the RAID is no longer reporting itself as degraded.

RAID

______ technologies are designed to increase the speed of reading and writing data, to create one of several types of fault-tolerant volumes, or both. Fault tolerance is the capability of the hard drive system to continue working after there is a problem with one of the drives.

RAID 0 Striping

• Data is striped across multiple disks in an effort to increase performance. • High performance *Not fault tolerant • No redundancy • Minimum of 2 disks