Gluster users - Mar 2016 - Impact of force option in remove-brick

Hi Team,

I have the following scenario:

1. I have one replica 2 volume in which two brick are available.
2. in such permutation and combination I got the UUID of peers mismatch.
3. Because of UUID mismatch when I tried to remove brick on the second
board I am getting the Incorrect Brick failure.

Now, I have the question if I am using the remove-brick command with the
'force' option it means it should remove the brick in any situation
either
the brick is available or its UUID is mismatch.

I just want to know what is the difference in the following scenario:

1. remove-brick without the force option
2. remove-brick with the force option


Regards
Abhishek
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On 03/22/2016 11:35 AM, ABHISHEK PALIWAL wrote:
> Hi Team,
> 
> I have the following scenario:
> 
> 1. I have one replica 2 volume in which two brick are available.
> 2. in such permutation and combination I got the UUID of peers mismatch.
You *should not* get UUID mismatches and if you happen to get into that
situation your cluster is messed up and remove brick wouldn't
work.
> 3. Because of UUID mismatch when I tried to remove brick on the second
> board I am getting the Incorrect Brick failure.
> 
> Now, I have the question if I am using the remove-brick command with the
> 'force' option it means it should remove the brick in any situation
> either the brick is available or its UUID is mismatch.
UUID is the source of information by which all our configuration is
managed. If UUID has gone for a toss then there is no way that glusterd
can pick up the right brick. So here this question of difference between
remove brick and remove brick force really doesn't
matter.
> 
> I just want to know what is the difference in the following scenario:
> 
> 1. remove-brick without the force option
> 2. remove-brick with the force option
> 
> 
> Regards
> Abhishek
> 
> 
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>

>> I just want to know what is the difference in the following scenario: 
1. remove-brick without the force option 
2. remove-brick with the force option 


remove-brick without force option will perform task based on your option,
for eg. remove-brick start option will start migration of file from given
remove-brick to other available bricks in the cluster. you can check status
of this remove-brick task by issuing remove-brick status command.

But remove-brick with force option will just forcefully remove brick from the
cluster.
It will result in data loss in case of distributed volume, because it will not
migrate file
from given remove-brick to other available bricks in the cluster. In case of
replicate volume
you might not have problem by doing remove-brick force because later on after
adding brick you
can issue heal command and migrate file from first replica set to this newly
added brick.

Thanks,

~Gaurav

----- Original Message -----
From: "ABHISHEK PALIWAL" <abhishpaliwal at gmail.com>
To: gluster-users at gluster.org, gluster-devel at gluster.org
Sent: Tuesday, March 22, 2016 11:35:52 AM
Subject: [Gluster-users] Impact of force option in remove-brick

Hi Team, 

I have the following scenario: 

1. I have one replica 2 volume in which two brick are available. 
2. in such permutation and combination I got the UUID of peers mismatch. 
3. Because of UUID mismatch when I tried to remove brick on the second board I
am getting the Incorrect Brick failure.

Now, I have the question if I am using the remove-brick command with the
'force' option it means it should remove the brick in any situation
either the brick is available or its UUID is mismatch.

I just want to know what is the difference in the following scenario: 

1. remove-brick without the force option 
2. remove-brick with the force option 


Regards 
Abhishek 

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