qr code in c# windows application Part 5: Managing Windows Server 2003 Storage and File Systems in Visual C#

Drawer QR-Code in Visual C# Part 5: Managing Windows Server 2003 Storage and File Systems

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Part 5: Managing Windows Server 2003 Storage and File Systems
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Microsoft Windows Server 2003 Inside Out Tip Plan shadow copies around backups When planning the run schedule for shadow copies be sure to take into account the backup schedule for the related volumes. If you schedule shadow copies during backup, the shadow copy service writers will experience time out errors and any shadow copies that should have been created at that time will be lost. If you suspect a scheduling conflict, you can use the VSSADMIN LIST WRITERS command to check the last error status of the shadow copy writers. You can change the default shadow copy times, add new scheduled run times, and schedule recurring tasks that create copies at specific time intervals during the day. However, it is recommended that you avoid creating shadow copies more frequently than once per hour. When configuring run schedules, keep in mind how much work is saved and how long users will have to retrieve versions of files. If you save changes 2 times a day during weekdays, the maximum of 64 shadow copies means that users have about 32 working days during which they could retrieve the oldest version of a file before it is automatically deleted. After you configure shadow copying, you must install a client on computers throughout the organization. Two clients are available: the Previous Versions Client and the Shadow Copy Client. The installation of these clients is discussed in the section entitled Using Shadow Copies on Clients later in this chapter. With either client, users can access the Previous Versions tab by right-clicking a shared file or folder, selecting Properties, and choosing Previous Versions. Users will then be able to view a version of a file, save a version of a file to a new location, or restore a previous version of a file. The clients can be distributed through Group Policy or Microsoft Systems Management Server (SMS).
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Managing Shadow Copies in Computer Management
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Shadow copies are configured on a per-volume basis. Each volume on a server that has shared folders must be configured separately for shadow copying. Tip
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Defragment volumes before enabling shadow copies Shadow copies can become corrupted on volumes that are heavily fragmented. It is recommended that you defragment volumes before enabling shadow copies.
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Part 5: Managing Windows Server 2003 Storage and File Systems
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Using Volume Shadow Copy
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Be careful when defragmenting If you defragment a volume while shadow copies are enabled, the oldest shadow copies can be lost. Shadow copy loss can occur because the shadow copy provider uses a copyon-write approach that uses a 16-kilobyte (KB) block level. If the volume s cluster size is smaller than 16 KB, the shadow copy provider cannot distinguish disk defragmentation I/O and normal write I/O operations and as a result can create an extra shadow copy. If there are already 64 copies of a file, the oldest file is then deleted, which is how the oldest shadow copy gets deleted accidentally. To prevent this, it is recommended that cluster size of volumes that use shadow copies be set to 16 KB or larger.
Configuring Shadow Copies in Computer Management
You can use Computer Management to configure shadow copying by following these steps:
1 Start Computer Management, expand Storage, and select Disk Management. Rightclick a volume in the Disk Management Volume List or Graphical View, and select Properties. 2 In the Properties dialog box, select the Shadow Copies tab, as shown in Figure 22-1.
F22ws01
Figure 22-1.
Enable shadow copies on a per-volume basis.
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Part 5: Managing Windows Server 2003 Storage and File Systems
Microsoft Windows Server 2003 Inside Out
3 Select the volume for which you want to configure shadow copies, and then click Settings. This displays the Settings dialog box shown in Figure 22-2.
F22ws02
Figure 22-2.
Set storage limits for shadow copies.
Configure mount points separately There s a limitation for volumes that have mount points. With a mount point, a volume is attached to an empty folder on an NTFS volume and made to appear as part of that volume. If you enable shadow copies on a volume with mounted drives, the mounted drives are not included and users will not be able to access previous versions of files on the mounted volume. The workaround is to share the mounted volume and enable shadow copies for this share. Users then must access the share path to the mounted volume to view previous versions. For example, if you have a folder F:\Eng\Data, and the Data folder is a mount point for G, you enable shadow copies on both drives F and G. You share F:\Eng as \\CorpSvr01\Eng, and you share F:\Eng\Data as \\CorpSvr01\Data. In this example, users can access previous versions of \\CorpSvr01\Eng and \\CorpSvr01\ Data, but not \\CorpSvr01\Eng\Data.
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