[Gluster-users] Failed file system

Wed Aug 3 19:55:59 UTC 2016

Hi,
I'm not expert in Gluster but, i think it would be better to replace the downed brick with a new one.Maybe start from here;
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Managing%20Volumes/#replace-brick

-- 

Respectfully

    Mahdi A. Mahdi

Date: Wed, 3 Aug 2016 15:39:35 -0400
From: amoya at moyasolutions.com
To: gluster-users at gluster.org
Subject: Re: [Gluster-users] Failed file system

Does anyone else have input?we are currently only running off 1 node and one node is offline in replicate brick.we are not experiencing any downtime because the 1 node is up.I do not understand which is the best way to bring up a second node.Do we just re create a file system on the node that is down and the mount points and allow gluster to heal( my concern with this is whether the node that is down will some how take precedence and wipe out the data on the healthy node instead of vice versa)Or do we fully wipe out the config on the node that is down, re create the file system and re add the node that is down into gluster using the add brick command replica 3, and then wait for it to heal then run the remove brick command for the failed brickwhich would be the safest and easiest to accomplishthanks for any input

From: "Leno Vo" <lenovolastname at yahoo.com>
To: "Andres E. Moya" <amoya at moyasolutions.com>
Cc: "gluster-users" <gluster-users at gluster.org>
Sent: Tuesday, August 2, 2016 6:45:27 PM
Subject: Re: [Gluster-users] Failed file system

if you don't want any downtime (in the case that your node 2 really die), you have to create a new gluster san (if you have the resources of course, 3 nodes as much as possible this time), and then just migrate your vms (or files), therefore no downtime but you have to cross your finger that the only node will not die too...  also without sharding the vm migration especially an rdp one, will be slow access from users till it migrated.
you have to start testing sharding, it's fast and cool...

    On Tuesday, August 2, 2016 2:51 PM, Andres E. Moya <amoya at moyasolutions.com> wrote:

 couldnt we just add a new server bygluster peer probegluster volume add-brick replica 3 (will this command succeed with 1 current failed brick?)let it heal, then gluster volume remove remove-brickFrom: "Leno Vo" <lenovolastname at yahoo.com>To: "Andres E. Moya" <amoya at moyasolutions.com>, "gluster-users" <gluster-users at gluster.org>Sent: Tuesday, August 2, 2016 1:26:42 PMSubject: Re: [Gluster-users] Failed file systemyou need to have a downtime to recreate the second node, two nodes is actually not good for production and you should have put raid 1 or raid 5 as your gluster storage, when you recreate the second node you might try running some VMs that need to be up and rest of vm need to be down but stop all backup and if you have replication, stop it too.  if you have 1G nic, 2cpu and less 8Gram, then i suggest all turn off the VMs during recreation of second node. someone said if you have sharding with 3.7.x, maybe some vip vm can be up...if it just a filesystem, then just turn off the backup service until you recreate the second node. depending on your resources and how big is your storage, it might be hours to recreate it and even days...here's my process on recreating the second or third node (copied and modifed from the net),#make sure partition is already added!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!This procedure is for replacing a failed server, IF your newly installed server has the same hostname as the failed one:(If your new server will have a different hostname, see this article instead.)For purposes of this example, the server that crashed will be server3 and the other servers will be server1 and server2On both server1 and server2, make sure hostname server3 resolves to the correct IP address of the new replacement server.#On either server1 or server2, dogrep server3 /var/lib/glusterd/peers/*This will return a uuid followed by ":hostname1=server3"#On server3, make sure glusterd is stopped, then doecho UUID={uuid from previous step}>/var/lib/glusterd/glusterd.info#actual testing below,[root at node1 ~]# cat /var/lib/glusterd/glusterd.infoUUID=4b9d153c-5958-4dbe-8f91-7b5002882aacoperating-version=30710#the second line is new.........  maybe not needed...On server3:make sure that all brick directories are created/mountedstart glusterdpeer probe one of the existing servers#restart glusterd, check that full peer list has been populated using gluster peer status(if peers are missing, probe them explicitly, then restart glusterd again)#check that full volume configuration has been populated using gluster volume infoif volume configuration is missing, do #on the other nodegluster volume sync "replace-node" all#on the node to be replacedsetfattr -n trusted.glusterfs.volume-id -v 0x$(grep volume-id /var/lib/glusterd/vols/v1/info | cut -d= -f2 | sed 's/-//g') /gfs/b1/v1setfattr -n trusted.glusterfs.volume-id -v 0x$(grep volume-id /var/lib/glusterd/vols/v2/info | cut -d= -f2 | sed 's/-//g') /gfs/b2/v2setfattr -n trusted.glusterfs.volume-id -v 0x$(grep volume-id /var/lib/glusterd/vols/config/info | cut -d= -f2 | sed 's/-//g') /gfs/b1/config/c1mount -t glusterfs localhost:config /data/data1#install ctdb if not yet installed and put it back online, use the step on creating the ctdb config but #use your common sense not to deleted or modify current one.gluster vol heal v1 fullgluster vol heal v2 fullgluster vol heal config full     On Tuesday, August 2, 2016 11:57 AM, Andres E. Moya <amoya at moyasolutions.com> wrote:   Hi, we have a 2 node replica setupon 1 of the nodes the file system that had the brick on it failed, not the OScan we re create a file system and mount the bricks on the same mount pointwhat will happen, will the data from the other node sync over, or will the failed node wipe out the data on the other mode?what would be the correct process?Thanks in advance for any help_______________________________________________Gluster-users mailing listGluster-users at gluster.orghttp://www.gluster.org/mailman/listinfo/gluster-users     

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