MSI MS-91F7 Manual de usuario descargar pdf (Pagina 29)

Offline versus Online Data Processing

In the course of time there have been developed various methods of data processing. Despite

different work concept, all of them can be divided into two principal groups: offline (cold) and

online (hot) data processing techniques.

As the name infers, offline data processing can only be accomplished when the data is in consistent

state (the operating system and all the applications are completely shut down). Actually it is the most

preferable way of image creation or data cloning, since software can obtain an exclusive right to

process data that guaranties high level of operating efficiency. However, the offline data processing

is absolutely out of question when dealing with 24/7 production environments.

In contrast, online data processing enables to create a consistent snapshot even as the data is

currently modified. It is particularly useful for systems with high availability requirements, but it won’t

be accomplished until all active transactions are complete. The point is to provide a coherent state

of all open files and databases involved in a process, taking into account that applications may still

keep writing to disks. As a result an online data processing cannot boast high operating speed.

Our program supports both offline and online methods of data processing. As far as online method is

concerned it offers its own hot processing algorithm together with the possibility to use snapshot

technologies provided by the Microsoft VSS framework.

Paragon Hot Processing Technology

Paragon Hot Processing is an online copy/backup technology for Windows NT+ family operating

systems. Developed back in 2001, nowadays it is integrated with all copy/backup solutions offered

by the company.

Paragon Hot Processing is not exactly a snapshot technology, though it has much in common with it.

During an online copy/backup, the program uses the kernel mode driver HOTCORE.SYS to intercept

and control disk write activity of applications and the operating system. The hotcore driver as an

integral part of the program is installed during the setup procedure (that’s why the system reboot is

required to complete the setup procedure). For the most part the driver is in the idle mode until it is

activated with the program. While in this mode it bypasses any calls having no effect on the overall

system performance, but a few kilobytes of the system memory.

Paragon Hot Processing technology offers copy/backup of locked partitions and hard disks under

Windows NT+ family operating systems providing both high operating efficiency as well as low

hardware requirements.

It is not recommended to use Paragon Hot Processing with active SQL Server,

Exchange or Oracle databases since the backup image contents may be

corrupted.

Volume Shadow Copy Service

Microsoft Volume Shadow Copy Service (VSS) is designed to provide the copy/backup infrastructure

for the Microsoft Windows XP/Vista/Server 2003/2008 operating systems. It offers a reliable mechanism

to create consistent point-in-time copies of data known as shadow copies. Developed by Microsoft

in close cooperation with the leading copy/backup solution vendors on the market, it is based on a

snapshot technology concept.

Initiated by a VSS aware copy/backup utility, VSS creates snapshots for the selected volumes and

represents them as virtual read-only devices, called volume shadow copies. Once the shadow

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MSI MS-91F7 Manual de usuario Pagina 29