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cluster:151 [2016/11/03 13:45]
hmeij07 [Mirror Data] 		cluster:151 [2016/11/04 15:23]
hmeij07
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 ==== Mirror Data ==== ==== Mirror Data ====
 +
 +When not all storage servers are up, client mounts will fail. This is just an optional "sanity check" which the client performs when it is  mounted. Disable this check by setting "sysMountSanityCheckMS=0" in beegfs-client.conf. When the sanity check is disabled, the client mount will succeed even if no servers are running.
 +
 +In order to able able to take a storage server off line without any impact, all content needs to mirrored.
  
 ** Before ** ** Before **
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 # enable mirroring for data by directory -numTargets needs to be set to max nr of storage servers? # enable mirroring for data by directory -numTargets needs to be set to max nr of storage servers?
 +# changed to 11/02/2016:
 +[root@n7 ~]# beegfs-ctl --setpattern --buddymirror /mnt/beegfs/home --chunksize=512k 
 [root@n7 ~]# beegfs-ctl --setpattern --buddymirror /mnt/beegfs/hmeij-mirror-data --chunksize=512k --numtargets=2 [root@n7 ~]# beegfs-ctl --setpattern --buddymirror /mnt/beegfs/hmeij-mirror-data --chunksize=512k --numtargets=2
 New chunksize: 524288 New chunksize: 524288
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 </code> </code>
 +
 +Here is an important note, from community list:
 +
 +  * "actual: 1" means "1 buddy mirror group"
 +    * so the important line that tells you that this file is mirrored is "Type: Buddy Mirror".
 +  * "desired: 2" means you would like to stripe across 2 buddy groups. (targets are buddygroups here)
 +
 +Another note: I changed paths for mirrormd and buddymirror to ''/mnt/beegfs/home'' and now I see connectivity data for meta node cottontail2 which was previously missing because I working on sub directory level.
 +
 +<code>
 +
 +[root@cottontail2 ~]# beegfs-net
 +meta_nodes
 +=============
 +cottontail2 [ID: 250]
 +   Connections: RDMA: 1 (10.11.103.250:8005);
 +
 +[root@cottontail2 ~]# beegfs-ctl --listnodes --nodetype=meta --details
 +cottontail2 [ID: 250]
 +   Ports: UDP: 8005; TCP: 8005
 +   Interfaces: ib1(RDMA) ib1(TCP) eth1(TCP) eth0(TCP)
 +
 +
 +</code>
 +
 ==== Quota ==== ==== Quota ====
  
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 # enable meta mirroring, directory based # enable meta mirroring, directory based
 +# change to 11/04/2016: used --createdir to make this home. 
 +[root@n7 ~]# beegfs-ctl --mirrormd /mnt/beegfs/home
 [root@n7 ~]# beegfs-ctl --mirrormd /mnt/beegfs/hmeij-mirror [root@n7 ~]# beegfs-ctl --mirrormd /mnt/beegfs/hmeij-mirror
 Mount: '/mnt/beegfs'; Path: '/hmeij-mirror' Mount: '/mnt/beegfs'; Path: '/hmeij-mirror'
cluster/151.txt · Last modified: 2016/12/06 20:14 by hmeij07

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