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Forum Discussion
NAS Mirror
Currently I have 1 ReadyNAS RN2120v2. We had a recent failure on site and lost all 16TB on the NAS. Looks like a 3138 would be close match to the 2120. 3138 is probably a little faster. I wan...
Some clarifcation for me.
If you want to mirror nas 1 to nas 2, what is the best way to connect their ethernet cables?
- For each nas do you BOND the network cards together and then plug cables into the switch?
- Can you plug one nas directly into another nas?
- How would you do that? For nas 1, one cable is plugged into the switch and the 2nd is plugged into the nas 2. Then nas 2 has its 2nd cable plugged into the switch as well.
I suggest wiring them both to your switches/routers, and run rsync over the normal network.
You can use bonding if you like, but I don't think you should do that specifically for backup. If your NAS has a lot of simultaneous users, then bonding will increase the throughput.
If bonding increases throughput then why do you not suggest the bond for a backup?
Thanks for the time.
It depends on the bonding mode you choose and when you run the backups.
If you use LACP bonding, then each data flow is still capped at 1 gigabit. So the backup is the only thing accessing the NAS, then it won't be any faster. If there are other flows from users, then it might be. The xmit hash policy commits each flow to use one specific NIC, so whether there is a speedup or not depends on how the hash comes out.
If you use static lags in the switch(es) and round-robin in the NAS, then the dataflows could use the full bond speed (e.g., 2 gigabits). But in that case, your normal users might suffer packet loss due to queue overflow in the switches, since they aren't able to receive at that rate. You can overcome that by enabling flow control in the switch(es) and clients. Though when the flow control kicks in you are losing the benefit of the speedup, since it pauses the NICS until the queues empty.
Thank you for the explanation.
What about Adaptive Load Balancing?
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