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--- cluster:151 [2016/10/31 19:24]
hmeij07 [Mirror Data]
+++ cluster:151 [2016/11/03 14:45]
hmeij07 [Mirror Data]
@@ Line 27: / Line 27: @@
 ==== Mirror Data ====
-** Before**
+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 **
 <code>
@@ Line 44: / Line 48: @@
          low     291.2GiB      61.8GiB  21%       18.5M       15.8M  85%
 </code>
+** Before **
 <code>
@@ Line 67: / Line 73: @@
 </code>
+** After **
+<code>
+[root@n7 ~]# beegfs-df
+METADATA SERVERS: (almost no changes...)
+STORAGE TARGETS: (each target less circa 10G)
+TargetID        Pool        Total         Free    %      ITotal       IFree    %
+========        ====        =====         ====    =      ======       =====    =
+         low     291.4GiB      40.7GiB  14%       18.5M       18.4M  99%
+         low     291.2GiB      51.9GiB  18%       18.5M       15.8M  85%
+# lets find an object
+[root@n7 ~]# beegfs-ctl --getentryinfo /mnt/beegfs/hmeij-mirror-data/hmeij/xen/bvm1.img
+Path: /hmeij-mirror-data/hmeij/xen/bvm1.img
+Mount: /mnt/beegfs
+EntryID: 178-581797C8-30
+Metadata node: n38 [ID: 48]
+Stripe pattern details:
++ Type: Buddy Mirror
++ Chunksize: 512K
++ Number of storage targets: desired: 2; actual: 1
++ Storage mirror buddy groups:
+  + 101
+# original
+[root@n7 ~]# ls -lh /mnt/beegfs/hmeij-mirror-data/hmeij/xen/bvm1.img
+-rwxr-xr-x 1 hmeij its 4.9G 2014-04-07 13:39 /mnt/beegfs/hmeij-mirror-data/hmeij/xen/bvm1.img
+# copy on primary
+[root@petaltail chroots]# ls -lh /var/chroots/data/beegfs_storage/buddymir/u2018/5817/9/60-58179513-30/178-581797C8-30
+-rw-rw-rw- 1 root root 4.9G Apr  7  2014 /var/chroots/data/beegfs_storage/buddymir/u2018/5817/9/60-58179513-30/178-581797C8-30
+# copy on secondary
+[root@swallowtail ~]# find /data/beegfs_storage -name 178-581797C8-30
+/data/beegfs_storage/buddymir/u2018/5817/9/60-58179513-30/178-581797C8-30
+[root@swallowtail ~]# ls -lh /data/beegfs_storage/buddymir/u2018/5817/9/60-58179513-30/178-581797C8-30
+-rw-rw-rw- 1 root root 4.9G Apr  7  2014 /data/beegfs_storage/buddymir/u2018/5817/9/60-58179513-30/178-581797C8-30
+# seems to work, notice the ''buddymir'' directory on primary/secondary
+</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)
 ==== Quota ====

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