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Forum Discussion
ReadyDR major difference in source snapshot size and destination ReadyDR backup size.
ReadyDR sounds like a great idea for additional backup security. Backup the source server snapshots with ability to restore from those only offers more options than were there prior. Setup was okay o...
Thanks for the reply. So, let me see if i understand this and please forgive as I didnt find that too easy to totally understand. The ReadyDR 'backup' is in fact not just the snapshot data of the specified share on the source NAS, it's all the file data AND the snapshot data of the specified source share on the NAS copied to the destination ReadyDR created share that was set up during the creation of the ReadyDR backup job. Is this right?
When you backup a snapshot that snapshot contains current data that hasn't changed since the snapshot was taken and data in the snapshot that is no longer present/has changed.
The same data may be shared by all snapshots and current data so backup history can be stored efficiently on the ReadyDR backup destination.
mdgm wrote:
When you backup a snapshot that snapshot contains current data that hasn't changed since the snapshot was taken and data in the snapshot that is no longer present/has changed.
What makes this hard to explain is that that data held in common with the main share is counted as being in the main share by the file system. But if you are backing that snapshot up (without backing up the main share), then the data held in common becomes part of the snapshot.
Strange that you should say this. I have in fact backed up the main share with a standard daily file backup job. The very same backup server is also the destination for the ReadyDR snapshot 'backup'. I think I would ideally prefer it on a different server but I only have the two, one data and one backup. The data backups consume 1.3 TB, the initial ReadyDR backup just completed a few days ago and it too is 1.3TB in size. A different destination share than the 'standard' backup of course. So this server already contains the data it would be creating the snapshot backups from. I did review the ReadyDR share on the backup server and do notice I have a few snapshots for the each day, about 4 so far as this just began. So, beside my surprise about the amount of space the ReadyDR snapshot consumes it does look to work. Time will tell if it's consistent.
Although I've started using the Snapshot feature for a spell I know I'm not the most educated about what they are as I find I am still surprised. I truly expected the ReadyDR snapshots to be about the same size or less than the 'smart' snapshot schedule already in use on the data on the primary data NAS unit (The ReadyDR schedule is set for a 'daily' run), which is about 100GB as I recall. To see it at 1.3 TB was a surprise.
Moozh wrote:
I truly expected the ReadyDR snapshots to be about the same size or less than the 'smart' snapshot schedule already in use on the data on the primary data NAS unit
I didn't expect that, since that means the ReadyDR backup couldn't be complete. If it worked that way, and I changed one block at the beginning of a file, that's the only block that ReadyDR would copy over - the rest of the file would be completely missing. (To be more clear - the origiinal block prior to the change is what would be copied. That's the only block that is unique to the snapshot - and the only block that would be accounted for in the snapshot space).
What I did expect is that it would mirror the entire share (main and snapshots) so it would be an identical copy of the share that was on the main NAS. It's sounding like its not. I haven't been able to use it myself (since at present I only have one OS-6 business NAS).
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