Re: Turn off replication

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Hello Karthik


Im having trouble adding the two bricks back online.  Any help is appreciated  

thanks 


when i try to add-brick command this is what i get 

[root@gluster01 ~]# gluster volume add-brick scratch gluster02ib:/gdata/brick2/scratch/
volume add-brick: failed: Pre Validation failed on gluster02ib. Brick: gluster02ib:/gdata/brick2/scratch not available. Brick may be containing or be contained by an existing brick

I have run the following commands and remove the .glusterfs hidden directories 

[root@gluster02 ~]# setfattr -x trusted.glusterfs.volume-id /gdata/brick2/scratch/
setfattr: /gdata/brick2/scratch/: No such attribute
[root@gluster02 ~]# setfattr -x trusted.gfid /gdata/brick2/scratch/
setfattr: /gdata/brick2/scratch/: No such attribute
[root@gluster02 ~]# 


this is what I get when I run status and info


[root@gluster01 ~]# gluster volume info scratch

 

Volume Name: scratch
Type: Distribute
Volume ID: 23f1e4b1-b8e0-46c3-874a-58b4728ea106
Status: Started
Snapshot Count: 0
Number of Bricks: 4
Transport-type: tcp,rdma
Bricks:
Brick1: gluster01ib:/gdata/brick1/scratch
Brick2: gluster01ib:/gdata/brick2/scratch
Brick3: gluster02ib:/gdata/brick1/scratch
Brick4: gluster02ib:/gdata/brick2/scratch
Options Reconfigured:
nfs.disable: on
performance.readdir-ahead: on
[root@gluster01 ~]# 


[root@gluster02 ~]# gluster volume status scratch
Status of volume: scratch
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick gluster01ib:/gdata/brick1/scratch     49156     49157      Y       1819 
Brick gluster01ib:/gdata/brick2/scratch     49158     49159      Y       1827 
Brick gluster02ib:/gdata/brick1/scratch     N/A       N/A        N       N/A  
Brick gluster02ib:/gdata/brick2/scratch     N/A       N/A        N       N/A  

 

Task Status of Volume scratch
------------------------------------------------------------------------------
There are no active volume tasks

 

[root@gluster02 ~]# 


This are the logs files from Gluster ETC

[2018-04-25 20:56:54.390662] I [MSGID: 106143] [glusterd-pmap.c:250:pmap_registry_bind] 0-pmap: adding brick /gdata/brick1/scratch on port 49152
[2018-04-25 20:56:54.390798] I [MSGID: 106143] [glusterd-pmap.c:250:pmap_registry_bind] 0-pmap: adding brick /gdata/brick1/scratch.rdma on port 49153
[2018-04-25 20:56:54.391401] E [MSGID: 106005] [glusterd-utils.c:4877:glusterd_brick_start] 0-management: Unable to start brick gluster02ib:/gdata/brick1/scratch
[2018-04-25 20:56:54.391457] E [MSGID: 106074] [glusterd-brick-ops.c:2493:glusterd_op_add_brick] 0-glusterd: Unable to add bricks
[2018-04-25 20:56:54.391476] E [MSGID: 106123] [glusterd-mgmt.c:294:gd_mgmt_v3_commit_fn] 0-management: Add-brick commit failed.
[2018-04-25 20:56:54.391490] E [MSGID: 106123] [glusterd-mgmt-handler.c:603:glusterd_handle_commit_fn] 0-management: commit failed on operation Add brick
[2018-04-25 20:58:55.332262] I [MSGID: 106499] [glusterd-handler.c:4349:__glusterd_handle_status_volume] 0-management: Received status volume req for volume scratch
[2018-04-25 21:02:07.464357] E [MSGID: 106452] [glusterd-utils.c:6064:glusterd_new_brick_validate] 0-management: Brick: gluster02ib:/gdata/brick1/scratch not available. Brick may be containing or be contained by an existing brick
[2018-04-25 21:02:07.464395] W [MSGID: 106122] [glusterd-mgmt.c:188:gd_mgmt_v3_pre_validate_fn] 0-management: ADD-brick prevalidation failed.
[2018-04-25 21:02:07.464414] E [MSGID: 106122] [glusterd-mgmt-handler.c:337:glusterd_handle_pre_validate_fn] 0-management: Pre Validation failed on operation Add brick
[2018-04-25 21:04:56.198662] E [MSGID: 106452] [glusterd-utils.c:6064:glusterd_new_brick_validate] 0-management: Brick: gluster02ib:/gdata/brick2/scratch not available. Brick may be containing or be contained by an existing brick
[2018-04-25 21:04:56.198700] W [MSGID: 106122] [glusterd-mgmt.c:188:gd_mgmt_v3_pre_validate_fn] 0-management: ADD-brick prevalidation failed.
[2018-04-25 21:04:56.198716] E [MSGID: 106122] [glusterd-mgmt-handler.c:337:glusterd_handle_pre_validate_fn] 0-management: Pre Validation failed on operation Add brick
[2018-04-25 21:07:11.084205] I [MSGID: 106482] [glusterd-brick-ops.c:447:__glusterd_handle_add_brick] 0-management: Received add brick req
[2018-04-25 21:07:11.087682] E [MSGID: 106452] [glusterd-utils.c:6064:glusterd_new_brick_validate] 0-management: Brick: gluster02ib:/gdata/brick2/scratch not available. Brick may be containing or be contained by an existing brick
[2018-04-25 21:07:11.087716] W [MSGID: 106122] [glusterd-mgmt.c:188:gd_mgmt_v3_pre_validate_fn] 0-management: ADD-brick prevalidation failed.
[2018-04-25 21:07:11.087729] E [MSGID: 106122] [glusterd-mgmt.c:884:glusterd_mgmt_v3_pre_validate] 0-management: Pre Validation failed for operation Add brick on local node
[2018-04-25 21:07:11.087741] E [MSGID: 106122] [glusterd-mgmt.c:2009:glusterd_mgmt_v3_initiate_all_phases] 0-management: Pre Validation Failed
[2018-04-25 21:12:22.340221] E [MSGID: 106452] [glusterd-utils.c:6064:glusterd_new_brick_validate] 0-management: Brick: gluster02ib:/gdata/brick2/scratch not available. Brick may be containing or be contained by an existing brick
[2018-04-25 21:12:22.340259] W [MSGID: 106122] [glusterd-mgmt.c:188:gd_mgmt_v3_pre_validate_fn] 0-management: ADD-brick prevalidation failed.
[2018-04-25 21:12:22.340274] E [MSGID: 106122] [glusterd-mgmt-handler.c:337:glusterd_handle_pre_validate_fn] 0-management: Pre Validation failed on operation Add brick
[2018-04-25 21:18:13.427036] I [MSGID: 106499] [glusterd-handler.c:4349:__glusterd_handle_status_volume] 0-management: Received status volume req for volume scratch
[root@gluster02 glusterfs]# 


---------------------------------
Jose Sanchez
Systems/Network Analyst 1
Center of Advanced Research Computing
1601 Central Ave.
MSC 01 1190
Albuquerque, NM 87131-0001
575.636.4232

On Apr 12, 2018, at 12:11 AM, Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> wrote:



On Wed, Apr 11, 2018 at 7:38 PM, Jose Sanchez <josesanc@xxxxxxxxxxxx> wrote:
Hi Karthik

Looking at the information you have provided me, I would like to make sure that I’m running the right commands. 

1.   gluster volume heal scratch info
If the count is non zero, trigger the heal and wait for heal info count to become zero.
2. gluster volume remove-brick scratch replica 1 gluster02ib:/gdata/brick1/scratch gluster02ib:/gdata/brick2/scratch force
3.  gluster volume add-brick “#" scratch gluster02ib:/gdata/brick1/scratch gluster02ib:/gdata/brick2/scratch


Based on the configuration I have, Brick 1 from Node A and B are tide together and Brick 2 from Node A and B are also tide together. Looking at your remove command (step #2), it seems that you want me to remove Brick 1 and 2 from Node B (gluster02ib). is that correct? I thought the data was distributed in bricks 1 between nodes A and B) and duplicated on Bricks 2 (node A and B). 
Data is duplicated between bricks 1 of nodes A & B and bricks 2 of nodes A & B and data is distributed between these two pairs.
You need not always remove the bricks 1 & 2 from node B itself. The idea here is to keep one copy from both the replica pairs.

Also when I add the bricks back to gluster, do I need to specify if it is distributed or replicated?? and Do i need a configuration #?? for example on your command (Step #2) you have “replica 1” when remove bricks, do I need to do the same when adding the nodes back ?
No. You just need to erase the data on those bricks and add those bricks back to the volume. The previous remove-brick command will make the volume plain distribute. Then simply adding the bricks without specifying any "#" will expand the volume as a plain distribute volue.

Im planning on moving with this changes in few days. At this point each brick has 14tb and adding bricks 1 from node A and B, i have a total of 28tb, After doing all the process, (removing and adding bricks) I should be able to see a total of 56Tb right ?
Yes after all these you will have 56TB in total.
After adding the bricks, do volume rebalance, so that the data which were present previously, will be moved to the correct bricks.

HTH,
Karthik

Thanks

Jose




---------------------------------
Jose Sanchez
Systems/Network Analyst 1
Center of Advanced Research Computing
MSC 01 1190
Albuquerque, NM 87131-0001
575.636.4232

On Apr 7, 2018, at 8:29 AM, Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> wrote:

Hi Jose,

Thanks for providing the volume info. You have 2 subvolumes. Data is replicated within the bricks of that subvolumes.
First one consisting of Node A's brick1 & Node B's brick1 and the second one consisting of Node A's brick2 and Node B's brick2.
You don't have the same data on all the 4 bricks. Data are distributed between these two subvolumes.
To remove the replica you can use the command
gluster volume remove-brick scratch replica 1 gluster02ib:/gdata/brick1/scratch gluster02ib:/gdata/brick2/scratch force
So you will have one copy of data present from both the distributes.
Before doing this make sure "gluster volume heal scratch info" value is zero. So copies you retain will have the correct data.
After the remove-brick erase the data from the backend.
Then you can expand the volume by following the steps at [1].


Regards,
Karthik

On Fri, Apr 6, 2018 at 11:39 PM, Jose Sanchez <josesanc@xxxxxxxxxxxx> wrote:
Hi Karthik

this is our configuration,  is 2x2 =4 , they are all replicated , each brick has 14tb. we have 2 nodes A and B, each one with brick 1 and 2. 

Node A  (replicated A1 (14tb) and B1 (14tb) ) same with node B (Replicated A2 (14tb) and B2 (14tb)).

Do you think we need to degrade the node first before removing it. i believe the same copy of data is on all 4 bricks, we would like to keep one of them, and add the other bricks as extra space

Thanks for your help on this

Jose





[root@gluster01 ~]# gluster volume info scratch
 
Volume Name: scratch
Type: Distributed-Replicate
Volume ID: 23f1e4b1-b8e0-46c3-874a-58b4728ea106
Status: Started
Snapshot Count: 0
Number of Bricks: 2 x 2 = 4
Transport-type: tcp,rdma
Bricks:
Brick1: gluster01ib:/gdata/brick1/scratch
Brick2: gluster02ib:/gdata/brick1/scratch
Brick3: gluster01ib:/gdata/brick2/scratch
Brick4: gluster02ib:/gdata/brick2/scratch
Options Reconfigured:
performance.readdir-ahead: on
nfs.disable: on

[root@gluster01 ~]# gluster volume status all
Status of volume: scratch
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick gluster01ib:/gdata/brick1/scratch     49152     49153      Y       1743 
Brick gluster02ib:/gdata/brick1/scratch     49156     49157      Y       1732 
Brick gluster01ib:/gdata/brick2/scratch     49154     49155      Y       1738 
Brick gluster02ib:/gdata/brick2/scratch     49158     49159      Y       1733 
Self-heal Daemon on localhost               N/A       N/A        Y       1728 
Self-heal Daemon on gluster02ib             N/A       N/A        Y       1726 
 
Task Status of Volume scratch
------------------------------------------------------------------------------
There are no active volume tasks

---------------------------------
Jose Sanchez
Systems/Network Analyst 1
Center of Advanced Research Computing
MSC 01 1190
Albuquerque, NM 87131-0001
575.636.4232

On Apr 6, 2018, at 3:49 AM, Karthik Subrahmanya <ksubrahm@xxxxxxxxxx> wrote:

Hi Jose,

By switching into pure distribute volume you will lose availability if something goes bad.

I am guessing you have a nX2 volume.
If you want to preserve one copy of the data in all the distributes, you can do that by decreasing the replica count in the remove-brick operation.
If you have any inconsistency, heal them first using the "gluster volume heal <volname>" command and wait till the
"gluster volume heal <volname> info" output becomes zero, before removing the bricks, so that you will have the correct data.
If you do not want to preserve the data then you can directly remove the bricks.
Even after removing the bricks the data will be present in the backend of the removed bricks. You have to manually erase them (both data and .glusterfs folder).
See [1] for more details on remove-brick. 


HTH,
Karthik


On Thu, Apr 5, 2018 at 8:17 PM, Jose Sanchez <josesanc@xxxxxxxxxxxx> wrote:

We have a Gluster setup with 2 nodes (distributed replication) and we would like to switch it to the distributed mode. I know the data is duplicated between those nodes, what is the proper way of switching it to a distributed, we would like to double or gain the storage space on our gluster storage node. what happens with the data, do i need to erase one of the nodes? 

Jose


---------------------------------
Jose Sanchez
Systems/Network Analyst 
Center of Advanced Research Computing
MSC 01 1190
Albuquerque, NM 87131-0001
575.636.4232


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