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Auditing Disk Space Use
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Enabling quotas causes a slight decrease in file system performance. By periodically enabling and disabling quotas, you can take advantage of the auditing capabilities provided by Windows XP Professional disk quotas without permanently affecting performance. To create a record of the audit, save a copy of the system log data from Event Viewer to a comma-delimited file that can be read by programs such as Microsoft Excel. These files can be useful for analyzing the data captured. Note
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When you disable quotas, the tracking information displayed in the Quota Entries window is no longer updated. To refresh this information (including the current disk space used by each user), enable disk quotas again.
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Disk Quotas in Multiple-Boot Configurations
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Disk quotas are not enforced and can be exceeded in multiple-boot configurations when an NTFS volume is mounted by using Windows NT 4.0. However, when that computer resumes running Windows XP Professional, users who exceeded their quotas must delete or move files to a different volume that is, until they are under their limit before they can store new files to the quota volume. Disk quotas are enforced on computers configured as a multiple-boot system with Windows XP Professional and Windows 2000 or Windows Server 2003.
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Using WMI to Script Disk Quotas
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Microsoft Windows Management Instrumentation (WMI) is the application programming interface (API) that allows all system components to be monitored and controlled, either locally or remotely. Using the WMI classes Win32_DiskQuota, Win32_QuotaSettings, and Win32_VolumeQuotaSetting, you can create scripts that help you to do the following:
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View and modify the quota settings for users for all disks on a computer by:
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Viewing the status of the quota Reporting or setting the warning level
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Working with File Systems
Reporting or setting the quota limit Reporting how much space is being used for a specified user
View and modify the quota settings and defaults for each disk on a computer by:
Reporting or setting the operational state of quotas on a disk (disabled, tracked, or enforced) Reporting or setting the default warning level Reporting or setting the default quota limit Enabling or disabling the logging of warning levels being exceeded Enabling or disabling the logging of quota limits being exceeded
Using these classes, you can take advantage of other standard WMI features such as WMI Query Language (WQL) query support and event generation based on changes in the data in these classes. For example, a program can request that it be notified when a user is within 2 MB of the quota limit. When this criterion is met, WMI sends an event notification to the program, allowing an action such as increasing the quota or sending an e-mail message to the user. Note
WMI. WQL is a subset of Structured Query Language (SQL) with minor changes to support
For more information about WMI, see the Microsoft Windows Management Instrumentation (WMI) SDK link on the Web Resources page at http://www.microsoft.com/windows/reskits /webresources.
File Compression
NTFS supports compression on individual files, all files within a folder, and all files within NTFS volumes. Because compression is implemented within NTFS, any Windows-based program can read and write compressed files without determining the compression state of the file. When a program opens a compressed file, NTFS decompresses only the portion of the file being read and then copies that data to memory. By leaving data in memory uncompressed, NTFS performance is not affected when it reads or modifies data in memory. NTFS compresses the modified or new data in the file when the data is later written to disk. The compression algorithms in NTFS support cluster sizes of up to 4 KB. When the cluster size is greater than 4 KB on an NTFS volume, none of the NTFS compression features are available.
Part II:
Desktop Management
Using Windows Explorer or My Computer to compress files Using Windows Explorer or My Computer, you can set the compression state of a file on an NTFS volume. You can also set the compression state of a folder or volume without changing the compression state of existing files in that folder. If you have Modify permission for a file or folder, you can change its compression state locally or across a network. To set the compression state of a volume 1. In My Computer or Windows Explorer, right-click the volume to compress or uncompress. 2. Click Properties to display the Properties dialog box. 3. On the General tab, select or clear the Compress drive to save disk space check box, and then click OK. 4. In the Confirm Attribute Changes dialog box, select whether to make the compression apply to the entire volume or only to the root folder. Any change to the compression attribute is applied to the files you specified. If you compress all files in the volume, the process might take a few minutes to finish, depending on the size of the volume, the number of files to compress, and the speed of the computer. The delay occurs because Windows XP Professional must change the compression state of every folder on the volume and compress or uncompress every file on the volume. Changing the compression state of folders is relatively fast because for each folder Windows XP Professional changes only the compression attribute. However, compressing or uncompressing every file on the volume takes longer because NTFS must read data in its current form (compressed or uncompressed) from the disk, convert the data to its new form in memory, and then write the data back to disk. To set the compression state of a folder or file 1. In My Computer or Windows Explorer, right-click the file or folder to compress or decompress. 2. Click Properties to display the Properties dialog box. 3. On the General tab, click Advanced. 4. In the Advanced Attributes dialog box, select or clear the Compress contents to save disk space check box and then click OK. 5. In the Properties dialog box, click OK. 6. If the compression state was altered for a folder, in the Confirm Attribute Changes dialog box, select whether to make the compression apply only to the selected folder or to the selected folder and all its files and subfolders. Click OK when done.
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