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20 Click Finish and the new Striped Volume has been created (as shown in the following illustration) Notice that drive S shows multiple times because it is made up of multiple disks
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RAID 0, known as disk striping, splits the data across all disks in the volume RAID 0 writes to all disks at the same time, decreasing the time it
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takes to read or write the data There is no fault tolerance in RAID 0; it is strictly for performance bene ts
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RAID level 1 is known as disk mirroring Disk mirroring uses two hard drives and duplicates the data from one drive to another The fact that RAID 1 does store a second copy of the data on another member of the volume means that this solution does offer fault tolerance Fault tolerance is the concept that if one part of the solution fails, the other guy will pick up the workload and the solution will continue to function If one of the disks in the mirror fails, you can replace the failed disk by breaking the mirror, adding a new functioning disk, and then rebuilding the mirror from the existing disk that did not fail Once you have reestablished the mirror, you have your fault tolerance back Figure 10-14 displays the concept of a mirror volume When a user saves data to a mirrored volume, the data is written to both disks that make up the volume Exercise 10-7 demonstrates how to create a mirrored volume in Windows 2000 Server
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FIGURE 10-14
A mirrored volume stores a copy of the saved data on both disks
Data
Disk 0
Disk 1
Providing Fault Tolerance
EXERCISE 10-7 Creating a Mirrored Volume in Windows 2000/2003 Server
In this exercise you will create a Mirrored Volume in Windows 2000/2003 Server using two of the dynamic disks created in the previous exercise Remember that a mirrored volume stores all the data on both members (disks) in the volume 1 Right-click My Computer and choose Manage 2 Right click on an area of unallocated space on disk 1 and choose Create Volume (as shown in the following illustration)
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3 The Create Volume wizard appears Click Next 4 Choose the volume type of Mirrored Volume (as shown in the following illustration), which is the volume type you wish to create, and choose Next
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5 Add disk 2 as a selected disk for the mirrored volume and type 200 MB as the total amount of space used on each disk (as shown in the following illustration) Also notice that the total space used by the volume is 200 MB as well Although there is 200 MB per disk, you can store only 200 MB the other 200 MB is to store a copy of the data in case of disaster
6 Click Next 7 Assign drive M as the drive letter and choose Next 8 Choose Next to format for NTFS 9 Choose Finish The mirrored volume is created (as shown in the following illustration) Notice that the legend in disk management displays the color codes for each volume type
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RAID 1 is known as disk mirroring whereby the data is duplicated across two different disks but using only one disk controller When using two disk controllers, one with each a hard disk connected to it, we term the RAID 1 solution disk duplexing rather than disk mirroring Figure 10-15 shows the difference between disk mirroring and disk duplexing They are both considered RAID level 1
RAID 1 is known as disk mirroring, which mirrors or stores a full
copy of the data on a second disk in case the rst disk fails
Providing Fault Tolerance
FIGURE 10-15
Disk mirroring Controller Controller
Disk duplexing Controller
Disk mirroring versus disk duplexing
Disk 0
Disk 1
Disk 0
Disk 1
RAID 5
RAID level 5 is also known as striping with parity because a RAID 5 volume acts as a RAID 0 volume but adds the parity information to create redundancy RAID 5 volumes write data to all disks in the volume but store redundant information on one of the disks per stripe (a stripe is a row made up of 64-KB chunks on each disk, as shown in Figure 10-16) For example, when you save data to a RAID 5 volume made up of four disks, the data is split up into 64-KB data chunks (that may change depending on the product or implementation) and written to each disk (let s say disk 0, 1, and 2) But disk 3 will store redundant data (parity data) of the three 64-KB blocks that have been saved already If the three 64-KB blocks are not suf cient to complete the saving of the le, the save operation will continue onto the next row There will be parity information for that row as well, but the parity information is stored on a different disk for each row
FIGURE 10-16
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