Merge pull request #542 from redis/DOC-738

Update persistent-ephemeral-storage.md

Author: mich-elle-luna

content/operate/rs/installing-upgrading/install/plan-deployment/persistent-ephemeral-storage.md

@@ -12,7 +12,7 @@ toc: 'true'
 weight: 50
 ---
 For each node in the cluster, you can configure paths for both persistent
-storage and ephemeral storage.
+storage and ephemeral storage. To do so, the volume must have full permissions for user and group `redislabs` or users:group `redislabs:redislabs`. See the [Customize system user and group]({{< relref "/operate/rs/installing-upgrading/install/customize-user-and-group" >}}) page for instructions.
 
 {{< note >}}
 The persistent storage and ephemeral storage discussed in this document are not related
@@ -22,12 +22,11 @@ to Redis persistence or AWS ephemeral drives.
 ## Persistent storage
 
 Persistent storage is mandatory. The cluster uses persistent storage to store
-information that needs to persist even if a shard or a node fails,
+information that needs to persist if a shard or a node fails,
 such as server logs, configurations, and files.
 
-For example, if you configure [persistence]({{< relref "/operate/rs/databases/configure/database-persistence.md" >}})
-for a database,
-then the persistence information is stored in this location.
+To set the frequency of syncs, you can configure [persistence]({{< relref "/operate/rs/databases/configure/database-persistence" >}})
+options for a database.
 
 The persistent volume must be a storage area network (SAN)
 using an EXT4 or XFS file system and be connected as an external storage volume.
@@ -47,10 +46,10 @@ Ephemeral storage must be a locally attached volume on each node.
 For disk size requirements, see:
 
 - [Hardware
-    requirements]({{< relref "/operate/rs/installing-upgrading/install/plan-deployment/hardware-requirements.md" >}})
+    requirements]({{< relref "/operate/rs/installing-upgrading/install/plan-deployment/hardware-requirements" >}})
     for general guidelines regarding the ideal disk size for each type of
-    storage
+    storage.
 - [Disk size requirements for extreme write
-    scenarios]({{< relref "/operate/rs/clusters/optimize/disk-sizing-heavy-write-scenarios.md" >}})
+    scenarios]({{< relref "/operate/rs/clusters/optimize/disk-sizing-heavy-write-scenarios" >}})
     for special considerations when dealing with a high rate of write
-    commands
+    commands.