Address /opt/mesosphere mountpoint requirement. (#1250)

Stephanie Bodoff · web-flow · commit 133a639c204e · 2017-11-20T14:29:12.000-08:00
* Address /opt/mesosphere mountpoint requirement. * Remove remark about /opt/mesophere and LVM per @vishnu2kmohan. * Incorporate feedback from @vishnu2kmohan.
diff --git a/1.10/installing/custom/system-requirements/index.md b/1.10/installing/custom/system-requirements/index.md
@@ -71,7 +71,9 @@ The agent nodes must also have:
     ```bash
     sudo systemctl stop firewalld && sudo systemctl disable firewalld
     ```
-*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` cannot be on a partition that is on an LVM logical volume or shared storage.
+
+*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` must be on the same mountpoint as `/`.  This is required because DC/OS installs systemd unit files under `/opt/mesosphere`. All systemd units must be available for enumeration during the initializing of the initial ramdisk at boot. If `/opt` is on a different partition or volume, systemd will fail to discover these units during the initialization of the ramdisk and DC/OS will not automatically restart upon reboot.
+
 *   The Mesos master and agent persistent information of the cluster is stored in the `/var/lib/mesos` directory.
     
     **Important:** Do not remotely mount `/var/lib/mesos` or the Docker storage directory (by default `/var/lib/docker`).
diff --git a/1.7/administration/installing/custom/system-requirements/index.md b/1.7/administration/installing/custom/system-requirements/index.md
@@ -92,7 +92,8 @@ Here are the agent node hardware requirements.
     ```bash
     sudo systemctl stop firewalld && sudo systemctl disable firewalld
     ```
-*   DC/OS is installed to `/opt/mesosphere`. Make sure that `/opt/mesosphere` exists on a partition that is not on an LVM Logical Volume or shared storage.
+
+*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` must be on the same mountpoint as `/`.  This is required because DC/OS installs systemd unit files under `/opt/mesosphere`. All systemd units must be available for enumeration during the initializing of the initial ramdisk at boot. If `/opt` is on a different partition or volume, systemd will fail to discover these units during the initialization of the ramdisk and DC/OS will not automatically restart upon reboot.
 
 ### Port and Protocol Configuration
 
diff --git a/1.8/administration/installing/custom/system-requirements/index.md b/1.8/administration/installing/custom/system-requirements/index.md
@@ -90,7 +90,9 @@ Here are the agent node hardware requirements.
     ```bash
     sudo systemctl stop firewalld && sudo systemctl disable firewalld
     ```
-*   DC/OS is installed to `/opt/mesosphere`. Make sure that `/opt/mesosphere` exists on a partition that is not on an LVM Logical Volume or shared storage.
+
+*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` must be on the same mountpoint as `/`.  This is required because DC/OS installs systemd unit files under `/opt/mesosphere`. All systemd units must be available for enumeration during the initializing of the initial ramdisk at boot. If `/opt` is on a different partition or volume, systemd will fail to discover these units during the initialization of the ramdisk and DC/OS will not automatically restart upon reboot.
+
 *   The Mesos master and agent persistent information of the cluster is stored in the `/var/lib/mesos` directory.
     
     **Important:** Do not remotely mount `/var/lib/mesos` or the Docker storage directory (by default `/var/lib/docker`).
diff --git a/1.9/installing/custom/system-requirements/index.md b/1.9/installing/custom/system-requirements/index.md
@@ -71,7 +71,10 @@ The agent nodes must also have:
     ```bash
     sudo systemctl stop firewalld && sudo systemctl disable firewalld
     ```
-*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` cannot be on a partition that is on an LVM logical volume or shared storage.
+
+*   DC/OS is installed to `/opt/mesosphere`. `/opt/mesosphere` must be on the same mountpoint as `/`.  This is required because DC/OS installs systemd unit files under `/opt/mesosphere`. All systemd units must be available for enumeration during the initializing of the initial ramdisk at boot. If `/opt` is on a different partition or volume, systemd will fail to discover these units during the initialization of the ramdisk and DC/OS will not automatically restart upon reboot.
+
+
 *   The Mesos master and agent persistent information of the cluster is stored in the `/var/lib/mesos` directory.
 
     **Important:** Do not remotely mount `/var/lib/mesos` or the Docker storage directory (by default `/var/lib/docker`).
