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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...
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.
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.
Sandshark wrote:
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.
Yes. Also, the backup won't start until the NAS is fully booted and ready to receive it. So if the backup isn't on 24x7, the backups are more robust if you "pull".
On the other hand, if you do a "push" backup, the source NAS will make a snapshot of the share,and back up the snapshot. That ensures the backup is coherent (nothing changing while the backup is running). So if you run the backup NAS 24x7, it is a little better to do a push.
OK! Now I'm really confused. Please see the attached file. It shows the current power management for the "Push" NAS. Seems to me if I had the "Pull" NAS configured the same way either one could wake the other up with a scheduled resync with 'Wake On LAN' set ON. No?
Is the example at:
https://kb.netgear.com/29929/ReadyNAS-OS-6-Setting-up-a-backup-job-with-rsync-over-SSH
Representative of how to set up resync? Or is there another more specific to my purpose? (Hopefully :^)
Will running a NAS 24/7 shorten its lifetime? (Used to be start-stops were the worse thing for a drive but that was years ago. What's the current opinion?)
Thanks for your suport and patience. Ron
No, the ReadyNAS cannot send a WoL to another system. Turning on WoL only sets it up to receive one. I believe there is a suggestion in the Idea Exchange to add the ability to send a WoL. But you would still have an issue with the target system shutting down -- either not doing so (because none is scheduled) or doing so before the job was complete (if it's not complete when a scheduled shut-down occurs).
I have seen no definitive studies to compare running continuosly vs power cycling. Common wisdom is somewhat split on the issue, especially when you throw drive spin-down into the mix. The drive manufacturers still use run time (MTBF) as their primary indicator Turning the system off definately saves power, both to run the system and to cool it. Living in Florida where I run my A/C for the majority of the year and havng my NASes in a room that is not the best cooled in the house, I power cycle my backup systems and don't run them at the same time. It iads in my comfort as well as keeping the NAS temperatures down. Since they are also on the same UPS as the main systems, that also leaves more backup time for the main systems most of the time.
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