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On my CentOS 6 box I would like to construct the following setup:

.----------------------.
|       Switch         |
'-=------------------=-'
  |       |       | 
  |       |       | 
.-=----.--=---.---=--.
| eth0 | eth1 | eth2 |
|-------------|------|
|    mode 4   |
'--------------------'
|    active-backup   |
'--------------------'

NICs eth0 and eth1 are 2 10 Gbit/s NICs and currently configured as mode 4. In order to prevent network loss on their failure, I would like to add eth2 (1 Gbit/s NIC) as active-backup.

Since it is not possible to have a bond with a bond, are there other ways I can make this work? The goal is to have 1 IP among the 3 NICs and ideally keep the mode 4 bond for eth0+1.

GoldenThunder
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  • You can put as many nics into a mode 4 bond as you wish. The active-backup would depend on your switch topology and if you have multiple partner addresses or a single mlag. You would not be able to put a bond inside of a bond; at least, not in the way you described. The bonding driver needs to talk to physical devices. Add a second switch, and you will have the setup you described. – Aaron Jun 19 '17 at 15:39
  • But for mode 4 all the NICs would have to have the same speed, wouldn't they? We are currently thinking about a mode 6 bond of all 3 - it does not give the best per-process bandwidth, but it should work for us (many users with many transfers). – GoldenThunder Jun 22 '17 at 10:41
  • mode 4 speed is based on the lag grouping and slowest speed of any nic. So if your group of 2 is active, you will have xor 2gb/s. I've not had much experience with mode 6. – Aaron Jun 22 '17 at 14:36

0 Answers0