Mount Point Planning › Directory Structure Definition

Directory Structure Definition

The cacloud rpm defined the directory structure down to the mount point directories (mp_01, mp_02, and so on).

The mount point customization in the Linux system cannot occur until the NFS appliance is installed and mounted in the FSTAB table configured in the chapter "Configuration".

How to Use CA Cloud Storage for System z with Data Domain NFS Exports

CA Cloud Storage for System z uses NFS export directories as repositories for Virtual Volume files. The Linux operating system mounts NFS exports as subdirectories of its file system by reading the /etc/fstab configuration file at startup.

You can use the EMC DataDomain (DD) Enterprise Manager to create NFS export directories for use with CA Cloud Storage for System z.

Follow these steps:

1. Use a web browser to log on to the EMC DataDomain Enterprise Manager. (See the EMC DataDomain Administration Guide for instructions.)
2. Select the MTree tab to create a new or edit an existing NFS export directory for use with CA Cloud Storage for System z.

   Important: We recommend that you consider replication of NFS exports in a Private Cloud or on-premise implementation. To prevent data loss in a disaster recovery situation, we recommend replication of Virtual Volumes to a remote site.

   When you create an NFS export to use with CA Cloud Storage for System z:

   1. Use the TCPIP address of the Linux system where CA Cloud Storage for System z runs as the client.
   2. Specify the following options:
      • Allow Connections from ports below 1024 (secure)
      • Anonymous User ID (UID) = 326
      • Anonymous Group ID (GID) = 326

      Note: 326 is the UID/GID defined for use by CA Cloud Storage for System z.

      Using these options the NFS export should indicate:

      rw,no_root_squash,no_all_squash,secure,anonuid=326,anongid=326

3. Exit the EMC DataDomain Enterprise Manager and log on to the Linux system running CA Cloud Storage for System z.

   Follow these steps:

   1. Run the cacloud set up command:

   sudo cacloud setup

   1. Select the FSTAB option to map the DD NFS export to the appropriate mount point sub-directory of Vault_01 used by CA Cloud Storage for System z.

      The following is an illustration of an /etc/fstab table entry that is used to mount an NFS export as mp_01:

      Paddress:/data/col1/VtapeDD /var/lib/cacloud/vault_01/mp_01 nfs rsize=131072,tcp,nolock,wsize=131072,nfsvers=3,intr,bg 0 0

   2. Save your changes to update the FSTAB table.
4. Reboot the Linux system to execute the FSTAB changes or use the following Linux command to apply the FSTAB changes:

   sudo /sbin/mount –a

5. Issue the following Linux command to confirm that the proper file system table changes were made:

   df –h

6. Return to the Cloud Storage Linux Installation and Configuration guide after the mount points are properly mapped to the DataDomain NFS export.