MCSE Windows server 2003- P10

MCSE Windows server 2003- P10: Windows Server 2003 is, of course, more secure, more reliable, more available, and easier to administer than any previous version of Windows. Let’s take a close look at the platform and how it compares to Microsoft Windows 2000. This lesson provides a brief overview of the Windows Server 2003 family, focusing on the differences among the product editions: Web Edition, Standard Edition, Enterprise Edition, and Datacenter Edition.
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MCSE Windows server 2003- P10 Lesson 4 Implementing RAID 11-35 Up to 32 disks can participate in a striped volume. The amount of space used on each disk in the volume will be equal to the smallest amount of space on any one disk. For example, if Disk 1 has 200 GB of unallocated space, and Disk 2 has 120 GB of space, the striped volume can contain, at most, 240 GB as the size of the stripe on Disk 1 can be no greater than the size of the stripe on Disk 2. All disk space in the volume is used for data; there is no space used for fault tolerance. Recovering a Striped Volume Because data is striped over more than one physical disk, performance is enhanced, but fault tolerance is decreased—there is more risk because if any one drive in the vol ume fails, all data on the volume is lost. It is important to have a backup of striped data. If one or more disks in a striped volume fails, you must delete the volume, replace the failed disk(s) and recreate the volume. Then you must restore data from the backup. ! Exam Tip Striped volumes provide maximum storage and performance but support no fault tolerance. The only recovery potion is that of your regular backup routine. Mirrored Volumes A mirrored volume provides good performance along with excellent fault tolerance. Two disks participate in a mirrored volume, and all data is written to both volumes. As with all RAID configurations, use separate controllers (by adding a controller, you cre ate a configuration called “duplexing”) for maximum performance. Mirrored volumes relate to RAID-1 hardware configurations. Create Mirrored Volumes To create a mirrored volume, you must have unallocated space on two dynamic disks. Right-click one of the spaces and choose Create Volume. The New Volume Wizard will step you through the process of selecting a mirrored volume and choosing space on another disk to include in the volume. Mirrored volumes can be assigned a drive letter and folder paths. Both copies of the mirror share the same assignment. You can also mirror an existing simple volume by right-clicking the volume and choos ing Add Mirror and selecting a drive with sufficient unallocated space. Once you have established the mirror, the system begins copying data, sector by sec tor. During that time, the volume status is reported as Resynching. Recovering from Mirrored Disk Failures The recovery process for a failed disk within a mirrored volume depends on the type of failure that occurs. If a disk has experienced transient I/O errors, both portions ofPlease purchase PDF Split-Merge on www.verypdf.com to remove this watermark. 11-36 Chapter 11 Managing Microsoft Windows Server 2003 Disk Storage the mirror will show a status of Failed Redundancy. The disk with the errors will report a status of Offline or Missing, as seen in Figure 11-8. Figure 11-8 A mirrored volume with a failed disk After correcting the cause of the I/O error—perhaps a bad cable connection or power supply—right-click the volume on the problematic disk and choose Reactivate Volume or right-click the disk and choose Reactivate Disk. Reactivating brings the disk or vol ume back online. The mirror will then resynchronize automatically. If you want to stop mirroring, you have three choices, depending on what you want the outcome to be: ■ Delete the volume If you delete the volume, the volume and all the information it contains is removed. The resulting unallocated space is then available for new volumes. ■ Remove the mirror If you remove the mirror, the mirror is broken and the space on one of the disks becomes unallocated. The other disk maintains a copy of the data that had been mirrored, but that data is of course no longer fault-tolerant. ■ Break the mirror If you break the mirror, the mirror is broken but both disks maintain copies of the data. The portion of the mirror that you select when you choose Break Mirror maintains the original mirrored volume’s drive letter, shared ...