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In fault tolerant disk arrays, such as RAID 5, a parity value is calculated for each bit of data at the same place on each disk in the array, and stored separately, so that the contents of any disk in the array can be calculated from the parity value and the contents of the other disks. This allows service to continue at reduced performance after the failure of any disk, and the failed disk can be replaced and the contents re-built without removing the array from service. Mirrored arrays, also known as RAID 1, simply maintain two copies, so that if one fails, the other can continue to serve.
Simple disk striping doesn't attempt to store either a parity bit or a complete copy; it just spreads all data across all disks. This can significantly improve read performance, but if any drive fails, it is impossible to reconstruct the lost data, or continue service.
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How do you protect your information when disposing a laptop computer?
Erase the information from the hard disk. Once may not be enough, because simple deletion of files does not erase the information. Re-formatting the disk is another possibility. You can also get commercial software that will totally wipe files and data from a system.
What year was the first 3.5 floppy disk invented?
it was introduced because it was a simple and easy memory storage and then they introduced Cd's which killed the floppy discs
What is ancient Egypt sun disk?
The Egyptian sun disk was called Aten.
What is HNP?
Herniated Nucleus Pulposus (HNP) - medical terminology for the following: Lumbar radiculopathy; Cervical radiculopathy; Herniated intervertebral disk; Prolapsed intervertebral disk; Slipped disk; Ruptured disk A herniated nucleus pulposus is a slipped disk along the spinal cord. The condition occurs when all or part of the soft center of a spinal disk is forced through a weakened part of the disk. definition comes from the Univ. of Maryland Medical Center web site.
What unit is the smallest unit of disk space that stores data and information?
It all depends on how your disk is formatted.
Why is simple disk striping not fault-tolerant?
if one disk fails,data contained on that disk is unavailable
Which method of fault tolerance is least expensive per MB of storage disk duplexing or disk striping with parity?
has to be raid 5. raid5 with the parity will consume about 1/3 of the disk space but will give just about the highest level of fault tolerance. raid0 - disk striping - will give you the full disk space but no fault tolerance raid1 - disk splitting/ duplexing - will give you full redundancy but will cost 50% of your disk space raid5 - parity - will do block-level striping with parity data , disk space cost about 30%, redundant
How many RAIDS are available for fault tolerance methods?
RAID (Redundant Array of Inexpensive Drives) is the technology developed to decrease risk involved with the usage of individual disks for Storage. RAID adds realibility & provides performance in Read methods. Well Known RAID Levels are 1. RAID0 - Striping, 2. RAID1-Mirroring, 3. RAID2 - Striping at Bit levelusing Errorcorrection code on disks, 4. RAID3 - BYTE Level striping with parity disk, 5. RAID4 -Block Level striping with Dedicatedparity disk, 6. RAID5 - Striping at Block level with Distributed Parity, 7. RAID6 - Block level striping with Dual Distributed Parity.All RAID levelsenable Fault Tolerant storage volumes except RAID0.
Which method of fault tolerance is the least expensive per MB of storage disk duplexing or disk striping with parity?
Disk duplexing requires writing the same data twice and requires an extra controller.Disk striping with parity only writes once and requires only one controller. Although the parity information in disk striping with parity does take up some space, it does not take up as much space as the duplicate data in disk duplexing.therefore,disk duplexing is more expensive.
Which RAID level will you implement to provide redundancy?
Type your answer here...Answer Explanation: RAID 1 uses a minimum of two hard disks to mirror data for fault tolerance. Each hard disk contains a complete copy of the data. Disk duplexing improves mirroring because each disk is on a separate controller. If one disk or controller fails in a duplexing RAID 1 array, the other disk can take over immediately to provide fault tolerance.RAID 5, also known as disk stripping with parity, provides fault tolerance by striping the data across a minimum of three and a maximum of 32 disks, and by storing parity information on each disk. This allows the RAID array to recover from a single disk failure.RAID 0, also known as disk striping, is used to increase performance by striping data over a minimum of two and a maximum of 32 disks. RAID 0 provides no fault tolerance.RAID 3, also known as disk stripping with a parity disk, provides fault tolerance by writing data across three or more drives. Because the least number of hard disks is required, RAID 1 will be used instead of RAID 3.
What raid level is disk striping with parity?
Raid 5
Does raid 5 provide fault tolerance?
Yes. RAID-5 • Fault-tolerant development of striped volume • Parity stripe written to each disk in volume • Parity for set of data always on separate disk from data within set • If one disk fails possible to reconstruct data from If one disk fails, possible to reconstruct data from parity • Minimum of 3 HD's required • Storage efficiency improves as number of HD's increased • Improvement in speed over single disk
What is the difference between disk duplexing or disk striping with parity?
Disk duplexing is where you're writing data to 2 or more disks, with each disk using its own controller. If one disk fails, the other disk continues to operate with no data loss. Even if you lose the disk controller, it is not a problem since you're using a separate controller for the other disk. It is considered an variation of RAID 1 disk mirroring. Disk striping does not duplicate data as in disk duplexing. It writes (stripes) data across 3 or more disks but uses parity checking for each disk. If one disk fails, the other drives can recreate the data stored on the failed one. It is considered RAID 5 level.
What is stripping a hard drive?
Striping is the automated process of writing data across multiple drives simulteneously. Striping is used to increase the performance of disk reads. When using striping, if you write a 5GB file across 5 drives, 1GB of data is written to each drive. Parallel reading of data from multiple disks can have a significant positive impact on performance, because the physical disk drive is most often the performance bottleneck. Striping is used in RAID Level 0. If one drive in a striped set fails, all of the data in the stripe set is lost. The data must be restored from backup. Because of this, striping is often combined with the use of parity (RAID 5) or mirroring
What is EMC storage?
EMC2 is the leading provider of networked Storage (computer networks hard disk storage) for Enterprise sized Companies....think Fortune 2000... They make Data information available to the Network Computers in a Fault tolerant and Highly Available environment.
The most common form of RAID used on modern networks relies on what techniques?
C: disk striping with distributed parity AKA RAID 5
You want to put multiple hard drives in your computer but you want them to be read as one big hard drive?
There are two ways: Research Disk Striping or RAID.
