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Securing the File System
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The Windows NT File System (NTFS) has been created to be a secure method to store data on fixed and removable disks. Before a user can access files on NTFS, the user must authenticate with a trusted Windows NT computer and then be granted specified usage permissions for those files. File-system permissions are cumulative, with the exception of the No Access option. That is, if a user is a member of a group that has Read-Only permissions and of a group that has Write-Only permissions, the user will effectively be able to read and write to files. For networked environments, Windows NT enables you to set share-level and file-system-level permissions. Though you can implement both, many administrators choose to leave the share-level permissions set to give the Everyone group Full Control, and then enforce restrictions via NTFS. This makes managing permissions easier and more efficient. The file allocation table (FAT) file system was not designed to be secure and therefore can only use share-level permissions. Though this may be okay for network users, any user that can log on locally will be able to access all files on a FAT partition. Finally, FAT partitions have a larger cluster size and will waste more space on large drives. NTFS was created to allow for security and recoverability in the Windows NT OS. Both of these features are unavailable in FAT (the file system used by MS-DOS and Windows 95/98 machines) or any other version of Windows. NTFS uses a transaction logging function for all disk functions. Basically, this means that before any disk operation is attempted, a log of that action is created. The transaction is then attempted. If, for any reason, the command cannot be completed, it is rolled back and no data is written to the disk. The operation can then be retried. Relational databases operate in much the same way to protect the integrity of their data you would never want half of an operation to complete. Imagine the fun you d have if a customer s street address was updated but her zip code remained the same. On a side note, you might be wondering how a backup program can access all files on your hard drives without having the permissions of all users on your network. Windows NT handles this by allowing you to assign a special user right, Bypass File Security for Backing Up Files. With this granted, the account is allowed to back up any files on a system. In Windows 2000, special database management roles can be enabled to allow backup permissions as needed. Security is still maintained, since only an Administrator or users who have appropriate permissions can restore and access these files.
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Apart from storing data files on tapes, you can replicate the data on multiple hard disks to protect against a disk failure. The redundant array of independent disks (RAID) specification was developed to allow several devices to function as a single logical device. One of the least reliable (yet, most relied upon) components in modern computers is the hard disk drive. Ironically, it is the information stored on these devices that is most difficult to retrieve in the case of a failure. Even with exemplary system backups, retrieving data can be time-consuming. For many businesses, this time is worth money. To protect against
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hard drive failures, it is possible to configure drives to automatically back up each other while they are in use. We ll look at the details of evaluating and implementing RAID in 5, Evaluating Data Protection Solutions, and in 6, Performing Database Backups. Here, we ll cover the basics of RAID as it pertains to the Windows NT OS.
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