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- Backup modes
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- Как скачать прошивка андроид 6 сони з2
Backups are a requirement for any sensible IT deployment, and Proxmox VE provides a fully integrated solution, using the capabilities of each storage and each guest system type. This allows the system administrator to fine tune via the mode option between consistency of the backups and downtime of the guest system.
Backups can be started via the GUI or via the vzdump command line tool. Before a backup can run, a backup storage must be defined. Refer to the Storage documentation on how to add a storage. A backup storage must be a file level storage, as backups are stored as regular files. In most situations, using a NFS server is a good way to store backups. You can save those backups later to a tape drive, for off-site archiving.
Backup jobs can be scheduled so that they are executed automatically on specific days and times, for selectable nodes and guest systems.
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There are several ways to provide consistency option mode , depending on the guest type. This mode provides the highest consistency of the backup, at the cost of a short downtime in the VM operation. It works by executing an orderly shutdown of the VM, and then runs a background Qemu process to backup the VM data.
After the backup is started, the VM goes to full operation mode if it was previously running. Consistency is guaranteed by using the live backup feature. This mode is provided for compatibility reason, and suspends the VM before calling the snapshot mode. Since suspending the VM results in a longer downtime and does not necessarily improve the data consistency, the use of the snapshot mode is recommended instead. This mode provides the lowest operation downtime, at the cost of a small inconstancy risk.
It works by performing a Proxmox VE live backup, in which data blocks are copied while the VM is running. If the guest agent is enabled agent: 1 and running, it calls guest-fsfreeze-freeze and guest-fsfreeze-thaw to improve consistency. Stop the container for the duration of the backup.
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This potentially results in a very long downtime. This mode uses rsync to copy the container data to a temporary location see option --tmpdir. Then the container is suspended and a second rsync copies changed files. After that, the container is started resumed again. This results in minimal downtime, but needs additional space to hold the container copy. Use of a local tmpdir is also required if you want to backup a local container using ACLs in suspend mode if the backup storage is an NFS server.
This mode uses the snapshotting facilities of the underlying storage. First, the container will be suspended to ensure data consistency.
Finally, the temporary snapshot is deleted again. Newer versions of vzdump encode the guest type and the backup time into the filename, for example. That way it is possible to store several backup in the same directory.
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The parameter maxfiles can be used to specify the maximum number of backups to keep. Restoring one or more big backups may need a lot of resources, especially storage bandwidth for both reading from the backup storage and writing to the target storage.
This can negatively effect other virtual guest as access to storage can get congested. To avoid this you can set bandwidth limits for a backup job.
Proxmox VE implements two kinds of limits for restoring and archive:. The read limit indirectly affects the write limit, as we cannot write more than we read.
A smaller per-job limit will overwrite a bigger per-storage limit. Each line has the following format:. Blank lines in the file are ignored, and lines starting with a character are treated as comments and are also ignored. Values from this file are used as default, and can be overwritten on the command line.
You can specify a hook script with option --script. This script is called at various phases of the backup process, with parameters accordingly set.
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Как скачать прошивка андроид 6 сони з2
More information. Jump to: navigation , search. Backup modes There are several ways to provide consistency option mode , depending on the guest type. Proxmox VE live backup provides snapshot-like semantics on any storage type. It does not require that the underlying storage supports snapshots. Also please note that since the backups are done via a background Qemu process, a stopped VM will appear as running for a short amount of time while the VM disks are being read by Qemu. However the VM itself is not booted, only its disk s are read.
By default additional mount points besides the Root Disk mount point are not included in backups. For volume mount points you can set the Backup option to include the mount point in the backup.
Device and bind mounts are never backed up as their content is managed outside the Proxmox VE storage library. Backup File Names Newer versions of vzdump encode the guest type and the backup time into the filename, for example. Bandwidth Limit Restoring one or more big backups may need a lot of resources, especially storage bandwidth for both reading from the backup storage and writing to the target storage.
This can be helpful if you need to restore a very important virtual guest as fast as possible. Example vzdump. Hook Scripts You can specify a hook script with option --script. File Exclusions this option is only available for container backups. You can also manually specify additional exclude paths, for example:.
Backup all guest systems and send notification mails to root and admin. Clone an existing container to a new container with a 4GB root file system, using pipes.
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