42040 vps file

Accordingly, there is a need for an efficient and effective method for referencing and using common VPS container files. In one embodiment, there is provided a server including a host running an operating system kernel. A plurality of containers VPSs is supported within an operating system kernel.

At least one application is available to users of the VPS. Each VPS has its own objects and files, shares services of the single instance of the OS, and virtualizes the single instance of the operating system. Each of the objects and the files of each VPS have a unique identifier in a context of the operating system kernel.

The server resources include any of a virtual memory allocated to each user, a pageable memory allocated in the OS kernel to support the VPSs, a pageable memory used by the OS kernel for support of user processes either in shared, or in exclusive form i.

Each VPS includes a plurality of processes, each with at least one thread servicing corresponding users, a plurality of objects and files associated with the plurality of threads. The hash attributes are contained in the extended attributes of the files that are stored along with the file. If the file checksums match, the file is not copied. Instead, a file redirect reference is used for opening the file located in private container directory.

The file can be remapped i. The operating system includes a plurality of threads for execution of user requests. The VPSs appear to a user as substantially stand-alone servers, and generally provide the functionality of a stand-alone server or remote computer, including all administrative operations. Additional features and advantages of the invention will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the invention.

The advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The present invention is directed to a system, method and computer program product for caching commonly used VPS container files.

A VPS or a container is a closed set, or collection, of processes, system resources, users, groups of users, objects and data structures.

The VPS of the exemplary embodiment offers to its users a service that is functionally substantially equivalent to a standalone server with remote access. From the perspective of an administrator, the VPS of the present invention appears substantially the same as a dedicated computer at a data center.

From a user perspective, the VPS functionally acts essentially like a remote server, and offers the same services, for example, through a dedicated IP address. Note that some processes running in kernel mode can provide services to multiple VPSs. The VPS processes use some of the same files.

A co-pending U. Whenever a VPS process requires a file, it locates a file link in a VPS private area and accesses the file in the physical memory. However, this system does not always work when a VPS is restored from a backup.

Typically, some of the links referencing the VPS files do not work or point to a wrong location, and the VPS cannot be launched. According to the exemplary embodiment, when VPS processes use files for read and write operations, the host OS calculates hash values or checksums for each of the files. The kernel utility intercepts read and write operations for files and performs required actions when it detects a file that is not shared.

Note that the file cache can be generated upon the file creation. The hash attributes are stored in a database and sorted by file size attribute. Note also that unsorted records can be kept in the database.

As an example, hashes may be divided into groups. The first bits of hashes are used as folder group name and corresponding sorted or unsorted hashes are stored inside. When a new hash value is received, it is directed to corresponding folder, as a type of sorting algorithm. The hash value can also be used as an address of a storage unit where corresponding data is stored, e. The proposed method does not necessarily require additional sorting of any kind.

Note that it is better not to use host-client requisites for VPSs. These operations can be performed by a special daemon. Then, the file in the container private directory is assigned a redirect link to its copy on the disk cache.

In other words, the OS kernel determines access to a disk where file inode is stored. If identical inodes are detected, the inode checksum and size value is provided to a user space daemon. The user space daemon is a user space application that checks all container files and collects file access statistics. The user space daemon can be implemented on the local server or on any server of the cluster or in the cloud cluster.

For example, if the user space daemon detects some files in container private directory that are frequently accessed by container processes, the user space daemon processes this information and takes appropriate actions. The OS kernel checks if the files have identical inodes in the database and, if the identical inodes are found, assigns redirect links to location of the same files in the disk cache.

The user space daemon also clears the disk cache of old files that have not been requested for a long time. If a file is stored at block level, the hash can be changed when the file blocks change. In this case, the hash is recalculated for a particular data block. This needs to be done fast, so a simple short hash function is recommended. Alternatively, hash values need to be calculated and stored for each data block.

According to the exemplary embodiment, a number of files inodes is not limited, but a disk space available for files is pre-set ahead of time. The files that have not been accessed for a long time are removed from cache and discarded.

The file access check and removal can be performed by another user space daemon, which scans the virtual storage independently from the users and removes files. The file expiration time is set by a system administrator. Alternatively, the files can be archived in a compressed form.

Note that the main advantage of the exemplary embodiment is not so much saving the disk space, but reducing a number of disk accesses. Thus, system efficiency and speed are advantageously increased. Note that random accesses to a conventional rotational HDD come to approximately 10 seconds of disk operation time.

In other words, instead of reading the same file five times from five different locations, the file is read once from the disk cache. The OS kernel detects presence of a common file for inodes i. The user space daemon finds the common container files based on the file access statistics. The daemon runs in the user space, but cannot be controlled by VPS users.

An administrative node VPS0 controlled by the system administrator can control the proposed daemons. If a file is simply re-named inside the container without affecting its hash value, nothing happens and the file may be read using an old hash value.

If changes in file contents and file metadata affect the hash value, another instance of the file may be created in the container's dedicated space, and then the file can be shared, as described. In one exemplary embodiment, the system automatically periodically scans containers for identical files using another user space daemon. The files are copied into a cache and stored there until their expiration time, after which the files are discarded or saved into an archive.

This increases overall system performance and operative memory usage, if a system has large amounts of redundant data i. Note that if a file is changed, the changed instance of file remains in container's private directory.

A list of container VPS processes is used for caching files into a fast disk cache. The file is always located in container's private directory. However, for fast file open operations PFcache file version can be used.

According to the exemplary embodiment, a container VPS file remains in the container's private directory after it is copied to disk cache. In case of migration of a container or if the container needs to be restored from a backup, the file stored in the private directory is used, if the file in the disk cache is not available.

This site is only for Avast Business products. You are here:. Invalid signature. DSA signature verification failed for some file. Most likely an error during file transfer or an inconsistent chain of files was used for diff application.

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Avast is not installed. Not a real error. This code is returned when installation cannot continue because some condition is not satisfied: reboot is needed before continuation, downgrade is not allowed. Code returned when update is requested and there is nothing new available. This code does not appear when only automatic updates are made because a check for a new version availability is made before update request.

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