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Dell HPC NFS Storage Solution High Availability Configurations with Large Capacities
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2) Step 2 – Logical volume configuration
In this step, a logical volume is created to access the capacity configured on the storage arrays.
NSS-HA requires a simple way to manage and scale a storage stack and so Linux logical volume
manager is used for its simplicity. In order to create a logical volume, physical volumes (PVs)
are created first. The PVs have a one-to-one correspondence with the virtual disks created in
the previous step. Once the physical volumes are created, they are combined into a volume
group (VG), and then a logical volume is allocated from the disk space of the VG. The LV
related command sets are part of the base Red Hat Enterprise Linux Operating System.
Steps to configure storage Figure 5.
3) Step 3 – File system configuration
In this step, a file system is created on the logical volume created in step 2. In NSS-HA, the Red
Hat Scalable file system (XFS file system) is adopted, as its features such as quick recovery,
massive scalability, and high performance
(1)
satisfy the high reliability, availability, and
performance goals of NSS-HA. The Scalable file system package is distributed with Red Hat
Enterprise Linux Operating System as an add-on component.
4) Step 4 – HA service configuration
In this step, the logical volume and XFS file system created in the previous two steps are
defined as resources in HA cluster configuration file. The XFS file system is exported via NFS,
and the NFS export is also defined as a resource in HA cluster. An HA service is built using these
resources and this HA service is what provides access to the storage. The HA cluster suite is an
add-on component of the Red Hat Enterprise Linux Operating System.