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Add sections about replication and backups

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Aliaksandr Valialkin 2019-05-29 13:14:01 +03:00
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@ -166,6 +166,36 @@ the update process. See [cluster availability](#cluster-availability) section fo
* Upgrade follows `Cluster resizing procedure` under the hood.
### Replication and data safety
VictoriaMetrics offloads replication to the underlying storage pointed by `-storageDataPath`.
We recommend storing data on [Google Compute Engine persistent disks](https://cloud.google.com/compute/docs/disks/#pdspecs),
since they are protected from data loss and data corruption. They also provide consistently high performance
and [may be resized](https://cloud.google.com/compute/docs/disks/add-persistent-disk) without downtime.
HDD-based persistent disks should be enough for the majority of use cases.
### Backups
We'd recommend performing periodical backups from [instant snapshots](https://medium.com/@valyala/how-victoriametrics-makes-instant-snapshots-for-multi-terabyte-time-series-data-e1f3fb0e0282)
for protecting from user errors such as accidental data deletion.
The following steps must be performed for each `vmstorage` node for creating a backup:
1. Create an instant snapshot by navigating to `/snapshot/create` HTTP handler. It will create snapshot and return its name.
2. Archive the created snapshot from `<-storageDataPath>/snapshots/<snapshot_name>` folder using any suitable tool that follows symlinks. For instance,
`cp -L`, `rsync -L` or `scp -r`. The archival process doesn't interfere with `vmstorage` work, so it may be performed at any suitable time.
Incremental backups are possible with `rsync --delete`, which should [remove extraneous files from backup dir](https://askubuntu.com/questions/476041/how-do-i-make-rsync-delete-files-that-have-been-deleted-from-the-source-folder).
There is no need in synchronizing backups among all the `vmstorage` nodes.
Restoring from backup:
1. Stop `vmstorage` node with `kill -INT`.
2. Delete all the contents of the directory pointed by `-storageDataPath` command-line flag.
3. Copy all the contents of the backup directory to `-storageDataPath` directory.
4. Start `vmstorage` node.
## Community and contributions