Monday, March 28, 2011

Self-Healing NTFS

Today I came across very interesting new NTFS feature introduced in Windows Server 2008 known as “Self-Healing NTFS” and thought of sharing with everyone.

Traditionally, you have had to use the Chkdsk.exe tool to fix corruptions of NTFS file system volumes on a disk. This process is intrusive and disrupts the availability of Windows systems. In the Windows Server 2008 operating system you can now use Self-healing NTFS to protect your entire file system efficiently and reliably, without having to be concerned about the details of file system technology. Because much of the self-healing process is enabled by default, you can focus more on productivity, and less on the state of your file systems. In the event of a major file system issue, you will be notified about the problem and will be provided with possible solutions.

What does self-healing NTFS do?

Self-healing NTFS attempts to correct corruptions of the NTFS file system online, without requiring Chkdsk.exe to be run. The enhancements to the NTFS kernel code base help to correct disk inconsistencies and allow this feature to function without negative impacts to the system.

What new functionality does this feature provide?

Self-healing NTFS provides the following functionality:

Helps provide continuous availability. The file system is always available, NTFS corrects all detected problems while the system is running, and Chkdsk.exe does not have to run in its exclusive mode except in extreme conditions.

Preserves data. Self-healing NTFS preserves as much data as possible, based on the type of corruption detected.

Reduces failed file system mounting requests that occur because of inconsistencies during restart or for an online volume. Self-healing NTFS accepts the mount request, but if the volume is known to have some form of corruption, a repair is initiated immediately. The exception to this would be a catastrophic failure that requires an offline recovery method—such as manual recovery—to minimize the loss of data.

Provides better reporting. Self-healing NTFS reports changes made to the volume during repair through existing Chkdsk.exe mechanisms, directory notifications, and update sequence number (USN) journal entries.

Allows authorized users to administer and monitor repair operations. This includes initiating on-disk verification, waiting for repair completion, and receiving progress status.

Recovers a volume if the boot sector is readable but does not identify an NTFS volume. In this case, the user needs to run an offline tool that repairs the boot sector. Self-healing NTFS can then initiate whatever scan is necessary to recover the volume.

Validates and preserves data within critical system files. For example, NTFS will not consider Win32k.sys to be a special file. If it repairs corruption in this file, it might leave the system in a state where the system cannot run. The user might be required to use system restore and repair tools.

Basic Definitions

Many IT learners have asked me to simplify the basis definitions, I am trying to put it in my own words making it simple to understand.

What is a forest?

The term "forest" can be described as collection of AD domains that share a single schema.
All DC's in the forest share this schema and it is replicated in a hierarchical fashion among them.

What is Schema?
Schema is nothing but the templates used to create an object in AD. The schema will have the template present even if the object is not present.
Example : I do not have a printer in the network, still the schema will have the template readyfor the printer .

What is Active Directory?

"Active Directory is the directory service used in Windows Server 2000,2003 & 2008 and is the foundation of Windows distributed networks. It can be described as collection (database) of network objects and resources. Objects can be users, printers, computers, OUs...etc
The core of Active Directory is a combination of an LDAP server and MIT Kerberos 5 KDC running on a Windows 2000,2003,2008 server acting as a domain controller that work as a unit to provide authentication ("Who are you?") and authorization ("What are you allowed to do?") information within a group of interlinked systems.

What is a Domain?

In Windows 2000, 2003 and 2008 a domain defines both an administrative boundary and a security boundary for a collection of objects that are relevant to a specific group of users on a network.A domain is an administrative boundary because administrative privileges do not extend to other domains.It is a security boundary because each domain has a security policy that extends to all security accounts within the domain. Active Directory stores information about objects in one or more domains.


Sunday, March 27, 2011

Windows Server 2008 virtualization : Webcasts...Just download, learn and understand...

Virtualization in a Nutshell.
This webcast is an introduction to Microsoft Vritulization which will help the IT Pros and the IT geeks to understand Microsoft Virtulization technologies. You will understand why use virtualization in the first place and why use Microsoft Technologies.

Virtualization and Windows Server 2008
Virtualization is becoming a key tool for improving overall manageability for the IT environment—Download this webcast to learn how Windows Server virtualization can help you build a strong, flexible platform and improve overall manageability.

Just visit the below link for you quest for knowledge.