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You have multiple components How do they play together The rst stage is wanting a backup, so the backup application, for example Windows Backup (VSS requestor), can enumerate the VSS writers on a system to ascertain which data can be backed up via VSS for example, an Exchange mail database or a NTFS partition and then communicates to the VSS coordinator that data is to be backed up The VSS writers are informed that a backup of data that they are responsible for is requested The VSS writer freezes any write to the data, ensures the data is consistent, and queues up any write requests to the data (read requests are still permitted) The VSS provider then takes a snapshot of the data once informed by the VSS writer that the data is ready This could be a clone or differential via a hardware or software provider After the snapshot is complete (it has to be within 10 seconds, or the snapshot is considered to have failed), the VSS writers are informed the snapshot has been taken The VSS writers write any queuedup writes that were marked while the copy was performed The VSS

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IDL uses exceptions as a standard way to indicate error conditions An IDL user exception is defined much like an IDL structure, and that allows an exception to contain an arbitrary amount of error information of arbitrary type However, exceptions cannot be nested Here is an example:

When we test the parts of the code that search for customers by email address, we stub CustomerBase as a collaborating object In some of those tests, no customer will be found so we return null:

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requestor, the backup software, is then noti ed that the snapshot was taken successfully The part that baf es most people is the actual VSS provider How, in under 10 seconds, is a copy of potentially hundreds of gigabytes of data taken There are two answers If you are using a SAN that supports VSS, the SAN has a VSS provider that takes advantage of the SAN functionality to copy large amounts of data in a small amount of time The actual methods depend on the SAN, but might involve caching data or writing data to other areas of disk while a copy nishes But it s all handled at the hardware level This hardware provider typically enables either a differential or clone snapshot, with the clone being a complete copy of the data in another location For those without a VSS-supported storage solution, such as a locally attached drive, how is that data snapshot-ed in 10 seconds or less The software VSS providers use takes differential snapshots, also known as copy-on-write, which work in a different way For a copy-on-write snapshot, no copy of the data is performed Instead, all the snapshot contains are blocks on the disk, which contain information related to the snapshot This process is shown in Figure 17-50 In step 1, you have a disk with data that takes up certain blocks on the disk A snapshot is taken in step 2, and in step 3, the snapshot is now linked to the blocks on the disk that the data occupied When a change is attempted on a block that is part of a VSS snapshot, in step 4 the write is intercepted; before the new data is written, the current content of the block is copied into the snapshot area and linked to the snapshot instance, and then the new data is written In this way, when a point-in-time snapshot needs to be viewed, the system looks at the current blocks on the volume related to the snapshot and then any blocks that have been added to the shadow copy area, as shown in step 5 These shadow copy blocks contain data that has subsequently been overwritten in the original block locations by new data, and the shadow copy blocks are effectively overlaid by whatever new data is in the block So when the snapshot is viewed, the data is viewed as it was at the time the snapshot was taken Remember, this is just the snapshot generation After the snapshot is generated, it can be exposed to an application, which could then copy the content of the snapshot to another location or disk There are advantages to the clone method Because the clone is a complete copy of the data, that snapshot is generally transportable, which means it could be copied to another server to be read Some solutions use this capability to perform a clone snapshot, copy the snapshot to another server, and then back up to tape on another server or even restore the.

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