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cluster:151 [2016/11/04 15:23]
hmeij07 		cluster:151 [2016/11/10 19:58]
hmeij07 [Mirror Meta]
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   * ''cottontail:/usr/local/bin/beegfs-admin-gui''   * ''cottontail:/usr/local/bin/beegfs-admin-gui''
 +
 +==== Resync Data ====
 +
 +[[http://www.beegfs.com/wiki/StorageSynchronization|StorageSynchronization Link]]
 +
 +//If the primary storage target of a buddy group is unreachable, it will get marked as offline and a failover to the secondary target will be issued. In this case, the former secondary target will become the new primary target.//
 +
 +Testing out fail over and deletion of data on secondary then a full resync process:
 +
 + 
 +  * started a full --resyncstorage --mirrorgroupid=101 --timestamp=0
 +  * got --getentryinfo EntryID for a file in my /mnt/beegfs/home/path/to/file and did the same for the directory the file was located in
 +  * did a cat /mnt.beegfs/home/path/to/file on a client (just fine)
 +  * brought primary storage down
 +  * redid the cat above (it hangs for a couple of minutes, then displays the file content)
 +  * while primary down, I ran rm -rf   /mnt/beegfs/home/path/to/ removing directory holding file
 +  * a cat now generates the expected file not found error
 +  * brought up primary and started a full --resyncstorage --mirrorgroupid=101 --timestamp=0
 +  * the nr of files and dirs discovered is as expected lower by the correct values
 +  * when I now search for the EntryIDs obtained before they are gone from /data/beegfs-storage (as expected).
 +
 +Nice that it works.
 +
 +So you can full storage content mirror. You'll still need rsnapshots to recover lost data or point in time restores.
  
 ==== Mirror Data ==== ==== Mirror Data ====
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    Ports: UDP: 8005; TCP: 8005    Ports: UDP: 8005; TCP: 8005
    Interfaces: ib1(RDMA) ib1(TCP) eth1(TCP) eth0(TCP)    Interfaces: ib1(RDMA) ib1(TCP) eth1(TCP) eth0(TCP)
 +               ^^^
  
 </code> </code>
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 ==== Mirror Meta ==== ==== Mirror Meta ====
 +
 +//Metadata mirroring can currently not be disabled after it has been enabled for a certain directory//
  
 Definitely want Meta content mirrored, that way I can use the n38-n45 nodes with local 15K disk, plus maybe cottontail2 (raid 1 with hot and cold spare). Definitely want Meta content mirrored, that way I can use the n38-n45 nodes with local 15K disk, plus maybe cottontail2 (raid 1 with hot and cold spare).
cluster/151.txt ยท Last modified: 2016/12/06 20:14 by hmeij07

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