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ReadyNAS RN42400 OS 6.8 to ReadyNAS RN42400 6.8 Mirror
I purchased a second ReadyNAS 42400 w/ "indentical" 2T drives and want to "mirror" the second NAS to the primary. I see Netgear has at least two ways to back up a NAS but it's not clear which is the simplest to implement and doesn't use any Internet traffic to preform backups. These systems are attached to my home LAN. I said Mirror because if one NAS goes down, the system, not individual drives, I want access to my data in Read/Write until the failed NAS can be replaced.
Can some please suggest an up-to-date description of how to accomplish this system arrangement?
Thanks,
Ron
It was a while ago that I posted that, I don't recall who the respondent was at this point (or if he is still active).
I don't believe he was saying that the air bearing wouldn't fail, I think he was just saying that he didn't believe frequent spinups would cause them to fail faster than drives that were spinning 24/7.
Causes I've seen reported include electrical component failure, physical contamination, mechanical arm failures, and motor failures.
I know for certain that enabling spin down (and putting NAS on power schedules) saves power, and I don't have any clear data that says whether it increases failure risk or decreases it. In the absense of that data, I enable spin down and use power schedules.
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RonGalwey wrote:
I want access to my data in Read/Write until the failed NAS can be replaced.
Set up the two NAS to use the same configuration, and make sure you keep them that way. Saving the config file on main NAS, and restoring it on the backup can speed that up - but some settings actually won't be transfered. So you do need to check.
Then set up share-by-share backup jobs using rsync. These can be set up either on the main NAS ("push") or on the backup (pull). If the backup NAS is on a power schedule, then use pull. Otherwise use push.
Also, it's simplest not to use home folders. You can accomplish that by disabling SMB for the home "share" in the web ui. If you must use home folders, then you need to back up home to a temporary share name on the backup NAS. Then when you cut over, you'll need to manually migrate the home folders (e.g, log in as each user, copy that user's data, rinse and repeat).
Snapshots on the backup NAS will let you roll back to previous backed up versions - which won't match the snapshots on the main NAS. I haven't found that to be a problem.
Thanks Stephen!
I'm pretty sure I undestand what you've written. However, for my clarity, by "power schedule" on the pull, I don't understand the significance of a power schedule for either the push or pull. Can you please elaborate?
In my ignorance, I'd like both to be on a power schedule based on use. And wake up when needed.
Ron
If you pull, the backup NAS will hold off on a scheduled shut down until all scheduled backup jobs are complete. If you push, the target does not know there is a backup taking place and will shut down anyway.
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