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Written by Mike
March 11, 2009
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Yes, you can. NexentaStor is designed and built to provide a full range of enterprise grade data replication capabilities.
First, the definitions:
Auto-Sync - a type of the appliance's data replication services. Maintains a fully synchronized copy of a given volume, file system, or emulated block device (a. k. a. zvol). NexentaStor auto-sync service provides a true mirror, inclusive of all snapshots.
Auto-Tier - a type of the appliance's data replication services. Regularly and incrementally copies data from one host (local or remote, appliance or non-appliance) to a destination, local or remote, again of any type. Unlike regular backup solutions with only the latest copy available on the backup destination, this solution provides the advantage of both "the latest copy" and a configurable number of previous copies.
Auto-CDP - a type of the appliance's data replication services. Continuous Data Protection, or remote mirroring replicates NexentaStor volumes remotely, in real time, at a block level. Conceptually, the service performs a function similar to local disk mirroring scheme of RAID 1 except that in case of Auto-CDP this is done over an IP network.
For NexentaStor Automatic Continuous Data Protection (CDP) extension, please see AutoCDP.
Both auto-sync and auto-tier are:
- Schedulable, fault-managed, fully configurable (tunable) NexentaStor Data Replication services that can be used in a variety of backup, archiving, and DR scenarios.
- Recursive. The auto-sync service will replicate its designated source folder (filesystem) and nested sub-folders. Similarly, the auto-tier service replicates its source directory and nested sub-directories, which may include nested folders/filesystems. Both services regularly and incrementally replicate a given source. Both services accept exclude option, to exclude certain sub-directories (auto-tier) or sub-folders (auto-sync) from copying.
- Designed from ground up to use a variety of transports (a.k.a. protocols), which provides required flexibility to execute over Internet and Intranet, from behind a firewall and in the environment that requires extra security.
- Support incremental intelligent replication, whereby, once the initial replication is done, only accumulated differences (the delta) between the source and the destination is transferred during all subsequent service runs.
- Support any schedule. You can schedule the services to run every minute, every hour at a given minute of the hour, every few hours, every day at a certain time, etc. You can schedule services to run once a year, or at certain day of every second month, and so on.
- Support all 3 possible data replication directions: local to local (L2L), local to remote (L2R), and remote to local (R2L). When replicating to or from remote host, the latter does not necessarily need to be a NexentaStor appliance, although in the auto-sync case it must be another ZFS based system.
- Provide a combined replication + snapshots capability. You can tier from a given source (for instance, from a given snapshot or a directory), and generate snapshot at the remote or local destination every time the replication has run.
All of the above is common and applies to both auto-sync and auto-tier. However, there are some important differences between these two data replication services. To help you decide which replication service(s) to deploy, please see the following F.A.Q.:
See also:
What's new
The amount of improvements in the auto-sync service has required a separate F.A.Q. article.
Please see: