If you want to use a single file system, then choose a file system on a physical device that is dedicated to the database. For best performance and reliability, choose a redundant array of independent disks RAID device or a logical volume on multiple physical devices and implement the stripe and mirror everything SAME methodology.
In doing so, he sends and receives a set of mail for the day. That process of sending and receiving mail changes the data inside the Exchange database. This presents a problem, because the database has at this point been partially backed up.
Its file on disk is only partially transferred to the storage device. These two views of the database are no longer consistent. A native Windows service, VSS facilitates creating a consistent view of application data during the course of a backup. In plainer English, VSS is a Windows service that interacts with installed applications to tell them when a backup is taking place.
It also reports back to the server when the backup is complete, instructing the application and the server to perform important post-backup tasks such as truncating logs and other cleanup activities. Why is VSS necessary?
Coordination, specifically coordination between those applications, their data, and the activities being completed by your backup solution. This coordination is required to avoid the situation told in the sidebar story below.
VSS comes into play any time a transactional-based application is installed to a Windows server that requires backups. This quieting action called quiescence creates a point in time from which backups are then sourced.
It ensures that a common starting point for backups is shared by the server and the backup application, guaranteeing that each maintains that consistent view of the data.
VSS relies on the coordination of three different components to maintain this consistent view. You can see those three components in Figure 1. At its upper-left are a set of VSS Writers. VSS Requestors can be, among other things, the application you use for backups.
The VSS Requestor is also the component which actually requests that a volume shadow copy be taken. Once requested, the VSS Writer will instruct the application to perform whatever actions are required to create that volume shadow copy.
The third component is the VSS Provider. Its job is to create and manage the shadow copies themselves.
The VSS Provider can be either the operating system in combination with its file system, or it can be a hardware provider on an external storage array. Note You can use the command vssadmin list writers to list the VSS Writers which have been installed to a Windows computer.Most backup solutions for Windows use Volume Shadow Copy Service (VSS) to create backup copies of the application or service data.
In some cases, the VSS service or one of its writers start to work incorrectly which results in failures during the backup. Download free Visio shapes stencils and templates for visio diagraming.
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Oracle offers a comprehensive and fully integrated stack of cloud applications and platform services. Jan 29, · We have an Oracle 11g database server on Windows R2 which I'm trying to backup & replicate using Veeam B&R Whenever the backup or replication job runs I get VSS writer errors preventing the job from completing.