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This section describes how to configure and install an SAP HANA scale-out cluster on a Dell Isilon F800 NAS system. The instructions include steps for:
Configuring the Isilon F800
The OneFS operating system centralizes cluster management through a web administration interface and a command-line interface (CLI). Both interfaces provide methods to:
OneFS minimum requirements for SAP HANA deployments
For SAP HANA deployments, OneFS 8.1.2 is the minimum required version. The following Roll Up DA patch is also required:
[RUP-DA](Protocols/Userspace) Roll-Up v1.0 (8.1.2.0)
Note: A field support engineer can download and install the DA patches from this location.
To achieve optimal performance for SAP HANA environments with Isilon all-flash scale-out NAS storage systems, you must apply some global settings to the Isilon system. These settings only become adjustable with the Roll-Up v1.0 (8.1.2.0) patch.
After the patch is installed, use the OneFS 8.1.2 CLI to adjust the settings. Log in to the OneFS CLI as root and run the following commands:
isi_sysctl_cluster efs.rbm.dwt_threads=4
/usr/likewise/bin/lwregshell set_value "[HKEY_THIS_MACHINE\\Services\\lwio\\Parameters\\Drivers\\nfs]" SchedulerFhaMaxConcurrentIO 22
/usr/likewise/bin/lwsm shutdown
The /usr/likewise/bin/lwsm shutdown command triggers a restart of the service, and the new settings become active.
The isi_sysctl_cluster command ensures that the settings are applied after a node or cluster reboot.
For more information, see the Isilon OneFS CLI Administration Guide.
The OneFS web administration interface is used to create and configure all storage directories and NFS exports for the SAP HANA scale-out cluster. For more information, see the OneFS Isilon Web Administration Guide.
Follow these steps to create a directory:
In File System Explorer, you can manage the content that is stored on your Isilon F800 cluster. You can navigate the Isilon file system (/ifs), add directories, and manage file and directory properties including data protection, I/O optimization, and UNIX permissions.
You can also use File System Explorer to create a directory in the /ifs directory tree. We created the directories /ifs/home/hana and /ifs/home/hana/SID.
We used “HIB” for our directory name
For our 2+1 SAP HANA cluster, we must create two data directories and two log directories within the HIB directory for the SAP HANA persistence, as shown in the following figure.
For optimal performance, Dell Technologies recommends disabling Endurant Cache (EC) for the SAP HANA data directories only.
EC is the OneFS caching mechanism for synchronous writes to improve latency. With the SAP HANA persistence, writes to data are asynchronous and writes to log are synchronous. EC therefore remains enabled for the log directories.
EC operates in combination with the OneFS write cache (coalescer). By default, EC and the coalescer are turned on. To turn them on or off using the Isilon OneFS CLI, open an SSH connection to any Isilon node in the cluster by using the node’s IP address.
isi set -c [on|off|endurant_all|coal_only] <directory_name>
isi set –R -c coal_only data1
isi set –R -c coal_only data2
The following figure shows the command for disabling EC along with the optimum settings for the SAP HANA data and log directories:
For more information about EC and the coalescer, see the Isilon OneFS CLI Administration Guide.
Use the OneFS web administration interface to create NFS export rules that define the mount points (paths) that are available to NFS clients and how the server performs with these clients. Each rule must have at least one path and can include additional paths. You can also specify that all subdirectories of the given path or paths are mountable. Otherwise, only the specified paths are exported and child directories are not mountable. An export rule can specify a particular set of clients, enabling you to restrict access to certain mount points or apply a unique set of options to these clients. If the rule does not specify any clients, the rule applies to all clients that connect to the server.
Enable or disable the NFS service and set the lock protection level and security type. These settings are applied across all node in the cluster. You can also change the settings for individual NFS exports that you define. Because Isilon storage is certified only for use with NFSv3 for SAP HANA deployments, you must enable the NFS export service and NFSv3:
Create NTS exports to share the SAP HANA directories with the SAP HANA clients. In our example, we created two NFS exports:
To create NFS exports:
Provide root access to allow the SAP HANA clients to mount the exports. The client can be identified by hostname, IPv4 or IPv6 address, subnet, or netgroup.
Dell Technologies recommends keeping the defaults.