Re: about split-brain

[Roman <romeo.r@xxxxxxxxx>]

Personally I would call it SPOF (single point of failure) and you should take care of it, when you work with some HA software.

HA requires not only software, but hardware HA (double switches, power sources etc). But, maybe you will have some help from devs for this.

2014-08-08 9:44 GMT+03:00 hwh@xxxxxxxxxxx <hwh@xxxxxxxxxxx>:

because if the network is not stable, this will be ocurr and file can't open due to split brain

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hwh@xxxxxxxxxxx

 

From: Roman

Date: 2014-08-08 14:27

To: hwh@xxxxxxxxxxx

Subject: Re: Re: about split-brain

How can it be a bug, if you don't wait for synchronization to complete?

2014-08-08 9:24 GMT+03:00 hwh@xxxxxxxxxxx <hwh@xxxxxxxxxxx>:

Is glusterfs bug ?  i want to know whether have some way to avoid this split-brain?

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hwh@xxxxxxxxxxx

 

From: Roman

Date: 2014-08-08 14:16

To: hwh@xxxxxxxxxxx

CC: gluster-users

Subject: Re: Re: about split-brain

So try your tests again, but wait for synchronization first. You can check the state of files on servers with getfattr -d -m. -e hex /path-to-file-on-gluster-server

both should return 0x000000000000000000000000

2014-08-08 9:11 GMT+03:00 hwh@xxxxxxxxxxx <hwh@xxxxxxxxxxx>:

Yes, I do not wait for synchronization to complete.

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hwh@xxxxxxxxxxx

 

From: Roman

Date: 2014-08-08 13:53

To: hwh@xxxxxxxxxxx

CC: gluster-users

Subject: Re: about split-brain

Hello,

Did you wait for synchronization to complete before plugging second server off? Usually it need 10-15 minutes. Sometimes faster.

2014-08-08 5:19 GMT+03:00 hwh@xxxxxxxxxxx <hwh@xxxxxxxxxxx>:

hi:

I have a problem about split-brain, details as below:

PC1 and PC2 is AFR, stored a file 1.txt

1. write "123" to 1.txt, then 1.txt in pc1 is same with 1.txt in PC2, content is "123"

2. PC1  network disconnect, write "45" to 1.txt, then  content of 1.txt in pc1 is "123",  

  

   content of 1.txt in pc2 is "12345"

3. PC2  network disconnect, but PC1 network is good, write "67" to 1.txt, then  content of 1.txt in pc1 is "12367",  

  

   content of 1.txt in pc1 is "12345"

4. so split brain occur

how glusterfs avoid this? Have some ways to solve? this is my questions. thank you

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hwh@xxxxxxxxxxx

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Best regards,
Roman.

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Best regards,
Roman.

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Best regards,
Roman.

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Best regards,
Roman.

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