Can also iSCSI Targets be synchronised?

Embedded server synchronisation software is a file system based data replication. iSCSI Targets are block based devices and therefore cannot be replicated using the software.

How can I backup the data locally?

Embedded Server Synchronisation software can also backup the data on to the local drives (for example a USB drive).

Backup jobs can also be scheduled

  1. Initialize the drive
  2. Create a share on that drive
  3. Create the backup job on that drive (set for destination and source server your local server)

What actually means Byte-level incremental Replikation?

Byte-level incremental replication is very useful feature that enables very fast backups of your data.

First time all data will be transferred completely – the next replication checks the checksum of the data and copies just the changed bytes of the file.

Example : if you have an exel file of 10 MB size and you only change one single entry …

euroNAS will just transfer the changed bytes of your exel file (just few kilobytes) and will not copy the whole 10 MB accross the network.

This saves a lot of bandwith and increases the backup speed.

Of course the backup file is still identical to the original file.

What is the advantage of data compression during the synchronisation?

Data compression compresses the data before they are sent over the network. This saves the bandwidth and increases the efficiency.

This option is very useful when copying the data across the internet or on a network with high load.

No shares are shown when creating the synchronisation job

This usually means that no shares for the synchronisation have been defined yet.

How can I enable snapshot replication?

Snapshot replication helps you to minimize the downtime and increase the productivity during backups of your euroNAS system.

With this option NAS Server creates automatically a snapshot of the source data and replicates them to the target server. The greates advantage is that not the live files in use are being transferred but their “frozen state”. This makes the transferred files more consistent than with traditional backup.

To enable this feature start the replication from the source server and select the option snapshot replication within the wizzard. euroNAS will then create a new special snapshot each time for replication – after the replication the snapshot will be automatically deleted.

How can I see if the files were replicated correctly?

Server synchronisation creates report file after each replication. Log files are stored in the folder “synclogs” on the share that you have defined under Synchronization - Settings.

You can also tell the service to email you the report after replication is done. This can be configured under services - Email Notification

How should I configure server synchronization (replication)?

euroNAS Server Synchronization, a built-in feature of euroNAS NAS Software, offers an advanced tool, with which data can be transferred locally or over long distances reliably and quickly, and if needed it can be easily restored without flooding the network with too much traffic.

Configuration is pretty simple and straight forward. Jobs can be set to run on a scheduled time or single jobs can be created.

First you need to define the shares you wish to replicate

To do this go to Synchronization - Replication Shares

Then go to Synchronization - Settings

And enter IP addresses of the servers that you wish to replicate.

IMPORTANT: Since the IP Addresses are used for security who can access the share all IP Addresses of the other servers needs to be entered – even if you don’t wish to use all addresses for replication. If not all are defined it is possible that connection gets refused.

Define also the share on which the synchronization logs will be saved.

Also you have a possibility to define additional options

  • Bandwidth – with this option set the replication will only use bandwidth defined
  • Data Compression – data will be compressed before it gets send to other server. This option makes sense if data is copied via VPN with lower bandwidth
  • Copy permission (ACL) – in this case ACLs of the files and folders will also be replicated
  • Instant copy will make replication faster – in this case file differences will not be first copied on to the target share and then pasted to the file but immediately pasted. This saves space on the target server and also speeds up the replication
  • Resolve UID/GID – with this option euroNAS will try to resolve User / Group IDs into names when transferred
  • Delete files that are not existing on source – If selected replication software will always check if the files on the target server exist on the source server. If they don’t exist they will be automatically deleted.

If this option is not selected it is possible that over time the target share gets full.

To configure scheduled synchronization go to Synchronization – Start sync / create schedule and select Schedule

You can now decide if data should be replicated daily or hourly (for example every 1 or 4 hours).

Assign a name to the replication job and decide at which time and weekdays the job should be started.

If you wish to run hourly sync jobs you only need to enter the name of the job and severity.

Select source server and target server (if you wish to copy locally from one share to another you can select your local server).

You can now define source and target share for the synchronization.

Option Sync via snapshot should be selected if data copied is in use (for example virtual images) – in this case before sync job is issued snapshot of the data will be created and copied (instead of live data) – in this case data consistency will be much better than with standard copy.

Now everything is configured and you can see the jobs and their current status in the main menu.