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exception Failed {}; exception RangeError { unsigned long supplied_val;

Windows Server Backup (WSB)

min_permitted_val; max_permitted_val;

snapshot on another server to quickly create a copy of a server for development/testing purposes Because a copy-on-write snapshot is just changes from the original data on the disk, the snapshot on its own is not complete and cannot be transported to another server for use

1 2 3

allowing(customerBase)findCustomerWithEmailAddress(theAddress); will(returnValue(null));

Exceptions, like structures, create a namespace, so the exception member names need be unique only within their enclosing exception Exceptions are types but cannot be used as data members of user-defined types For example, the following is illegal:

5 = Original data Snapshot of data Original data block Modified data block Snapshot copy of original data block

struct ErrorReport { Object obj; RangeError exc; };

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FIGURE 17-50 A copy-on-write snapshot in action Additionally, the copy-on-write increases system overhead Any time a write is performed to disk, if the write is to data covered by a copy-on-write snapshot, the old data rst has to be copied to another area before the write can be completed New to Windows Server 2008 is Diskshadow, which is an in-box VSS requestor that can be used to request and access volume shadow copies, both hardware and software This tool runs from the command line and can also be used in scripts to automate VSS processes The cool thing about Diskshadow is it s not just used to back up things In fact, it s more useful as a way to interrogate hardware and software snapshots to check content, list all the VSS writers on a system, enable a shadow copy to be mounted as a drive letter and accessed, import a transportable shadow copy (that is, a clone) into a system, and even revert a volume back to a shadow s copy content

To view the VSS providers, use the list providers command Notice that diskshadow is an environment Start diskshadow rst and then enter commands Unless you have a hardware add-on, you probably just have the Microsoft shadow copy provider, as in the following example:

An operation uses a raises expression to indicate the exceptions it may possibly raise:

There are two problems with this use of null in a test First, we have to remember what null means here, and when it s appropriate; the test is not self-explanatory The second concern is the cost of maintenance Some time later, we experience a NullPointerException in production and track the source of the null reference down to the CustomerBase We realize we ve broken one of our design rules: Never Pass Null between Objects Ashamed, we change the CustomerBase s search methods to return a Maybe type, which implements an iterable collection of at most one result

C:\>diskshadow Microsoft DiskShadow version 10 Copyright (C) 2007 Microsoft Corporation On computer: SAVDALDC01, 12/20/2007 4:38:32 PM

interface Unreliable { void can_fail() raises(Failed); void can_also_fail(in long l) raises(Failed, RangeError); };

DISKSHADOW> list providers * ProviderID: {b5946137-7b9f-4925-af80-51abd60b20d5} Type: [1] VSS_PROV_SYSTEM Name: Microsoft Software Shadow Copy provider 10 Version: 1007 CLSID: {65ee1dba-8ff4-4a58-ac1c-3470ee2f376a} Number of providers registered: 1

To view all the writers on your system, use the list writers command, which shows much more output Depending on the roles and features installed on a system, additional writers will be listed; for example, NTDS has a VSS writer (used by ADDS), IIS has a writer, and so on A list of all known shadow copies can be found via the list shadows all command Multiple commands can be placed in a script le and passed to diskshadow via the /s switch In the following steps, create a snapshot and then expose the snapshot as a drive letter (S:) Notice an environment variable is created, which contains the ID of the shadow copy to make it easy to script actions on an ID that is not known until the shadow copy is created:

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