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Thread: Resolving a split brain on replication

  1. #11
    Join Date
    Oct 2010
    Location
    GA
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    935

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    Check the MTU on the NICs on both nodes:
    eth0 at 1500 is OK, but the others need to be consistant. [9000]

    san01
    eth0 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
    eth1 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth2 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth3 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth4 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth5 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9000 Metric:1

    san02
    eth0 UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
    eth1 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth2 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth3 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth4 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1
    eth5 UP BROADCAST RUNNING SLAVE MULTICAST MTU:9216 Metric:1

  2. #12
    Join Date
    Aug 2008
    Posts
    236

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    great find and good attention to detail! it even makes more sense because both bond0 and bond1 are in the same subnet so a [jumbo] frame could be sent from bond1 on san01 and be received by bond0 on san02. And because the default frame size for ping is 1500 mtu, that makes it seem like connectivity is good!
    i'm going to make those changes and see if they fix it. i'm pretty confident at this point!

  3. #13
    Join Date
    Oct 2010
    Location
    GA
    Posts
    935

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    Quote Originally Posted by enealDC
    great find and good attention to detail! it even makes more sense because both bond0 and bond1 are in the same subnet so a [jumbo] frame could be sent from bond1 on san01 and be received by bond0 on san02. And because the default frame size for ping is 1500 mtu, that makes it seem like connectivity is good!
    i'm going to make those changes and see if they fix it. i'm pretty confident at this point!
    Let us know.
    Hope it works, I confident it will

  4. #14
    Join Date
    Aug 2008
    Posts
    236

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    Thanks! That was it.

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