SAP HANA Requirements
Before registering each SAP HANA server in ECX, ensure it meets the following requirements.
Supported Platforms/Configurations
| Database Versions/Types | Server Types | Operating Systems | Storage Configuration | Storage Systems |
Note that only one tenant is supported in Multiple Database Container (MDC) setups, in addition to the system tenant. |
Physical [4] |
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Virtual (VMware) [1, 3, 4] |
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[1] See System Requirements for supported VMware vSphere versions.
[2] Select the Physical provider type when registering the provider in ECX. Note that NetApp ONTAP and DellEMC storage systems are not supported.
[3] SAP HANA servers registered as virtual must have VMware Tools installed and running.
[4] Supported platforms: Intel based x86, IBM Power Systems (Little Endian)
Prerequisites
- The SAP HANA Client must be installed on your SAP HANA machine
- Create a symbolic link to the SAP HANA Client installation directory through the following command:
ln -s <installation directory of SAP HANA Client> /opt/hana- For example, if SAP HANA Client is installed in /hana/shared/<SID>/hdbclient, you would enter the following:
ln -s /hana/shared/<SID>/hdbclient/ /opt/hana.
Software
- The bash and sudo packages must be installed. Sudo must be version 1.7.6p2 or above. Run
sudo -Vto check the version. - Python version 2.6.x or 2.7.x must be installed.
- RHEL/OEL/CentOS 6.x only: Ensure the util-linux-ng package is up-to-date by running
yum update util-linux-ng. Depending on your version or distribution, the package may be named util-linux. - RHEL/OEL/CentOS 7.3 and above: A required Perl module, Digest::MD5, is not installed by default. Install the module by running
yum install perl-Digest-MD5. - Linux only: If data resides on LVM volumes, ensure the LVM version is 2.0.2.118 or later. Run
lvm versionto check the version and runyum update lvm2to update the package if necessary. - Linux only: If data resides on LVM volumes, the lvm2-lvmetad service must be disabled as it can interfere with ECX's ability to mount and resignature volume group snapshots/clones.
- Run the following commands to stop and disable the service:
systemctl stop lvm2-lvmetadsystemctl disable lvm2-lvmetad- Additionally, disable lvmetad in the LVM config file. Edit the file /etc/lvm/lvm.conf and set:
use_lvmetad = 0
Connectivity
- The SSH service must be running on port 22 on the server and any firewalls must be configured to allow ECX to connect to the server using SSH. The SFTP subsystem for SSH must also be enabled.
- The server can be registered using a DNS name or IP address. DNS names must be resolvable by ECX.
- In order to mount clones/copies of data, ECX automatically maps and unmaps LUNs to the servers. Each server must be preconfigured to connect to the relevant storage systems at that site.
- For Fibre Channel, the appropriate zoning must be configured beforehand.
- For iSCSI, the servers must be configured beforehand to discover and log in to the targets on the storage servers.
Authentication
- The application server must be registered in ECX using an operating system user that exists on the server (referred to as "ECX agent user" for the rest of this topic).
- During registration you must provide either a password or a private SSH key that ECX will use to log in to the server.
- For password-based authentication ensure the password is correctly configured and that the user can log in without facing any other prompts, such as prompts to reset the password.
- For key-based authentication ensure the public SSH key is placed in the appropriate authorized_keys file for the ECX agent user.
- Typically, the file is located at /home/<username>/.ssh/authorized_keys
- Typically, the .ssh directory and all files under it must have their permissions set to 600.
Registration
When registering a SAP HANA provider in ECX, note the following:
- The format for the port number is 3<instance number>15. So, for example, if the instance number is 07, then enter the following port number: 30715.
- The System Credentials are the credentials required to access the system. These credentials are used to log in to the system and perform restore operations.
- The Database Credentials are used for querying the database and performing copy operations. The user must have sufficient privileges to access the database.
Privileges
The ECX agent user must have the following privileges:
- Privileges to run commands as root and other users using sudo. ECX requires this for various tasks such as discovering storage layouts and mounting and unmounting disks.
- The sudoers configuration must allow the ECX agent user to run commands without a password.
- The !requiretty setting must be set.
For examples on creating a new user with the necessary privileges, see SAP HANA Requirements.
Sample Configuration of an ECX Agent User
The commands below are examples for creating and configuring an operating system user that ECX will use to log in to the application server. The command syntax may vary depending on your operating system type and version.
- Create the user that will be designated as the ECX agent user:
useradd -m ecxagent - Set a password if using password-based authentication:
passwd ecxagent - If using key-based authentication, place the public key in /home/ecxagent/.ssh/authorized_keys, or the appropriate file depending on your sshd configuration, and ensure the correct ownership and permissions are set, such as:
chown -R ecxagent:ecxagent /home/ecxagent/.sshchmod 700 /home/ecxagent/.sshchmod 600 /home/ecxagent/.ssh/authorized_keys- Place the following lines at the end of your sudoers configuration file, typically /etc/sudoers. If your existing sudoers file is configured to import configuration from another directory (for example, /etc/sudoers.d), you can also place the lines in a new file in that directory:
Defaults:ecxagent !requirettyecxagent ALL=(ALL) NOPASSWD:ALL
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