When considering a scale-out data protection solution, you must consider more than just the backup and scaling capabilities, but also the resiliency. That is why Veritas designed NetBackup Flex Scale to provide enterprise-level resiliency while also maximizing performance and usable capacity.
NetBackup Flex Scale includes self-healing capabilities that ensure seamless operation in the event of multiple concurrent failures without interrupting operations or losing data. These resiliency features are automatically configured and protect against failures of nodes, disks, containers, networks, and a full site failure.
As a cluster grows in size, so does the number of components that could potentially experience a failure. With this complexity in mind, Veritas designed NetBackup Flex Scale’s integrated resiliency features to scale along with cluster size automatically, increasing the resiliency of larger clusters. NetBackup will continue running and maintain data integrity in any of the failure scenarios shown here.
Check out my video showing NetBackup jobs continuing on a four-node cluster that experiences both a disk and a node failure.
You can also configure NetBackup Flex Scale to protect against site-wide failures in either a:
It starts with the clustered filesystem that stores your backup data, and protects it with erasure coding using an 8:4 data-to-parity ratio.
The way that works is:
Note: In the event of failure, such as disk failure, access to any eight of these twelve blocks maintains the data integrity and allows for the recreation of missing fragments automatically.
If any node gets more than one fragment of data from a stripe, NetBackup Flex Scale ensures that the fragments land on different drives to deliver the highest resiliency. That way, if a disk fails, you are only losing a single fragment from a stripe, and you can lose a total of 4 fragments.
In short: you can lose any 4 disks in a cluster and your data remains intact.
In addition to high data durability levels, erasure coding 8:4 also optimizes NetBackup Flex Scale performance for both backup and restores by using the I/O resources of the entire disk pool to ingest backup data. This eliminates bottlenecks otherwise caused by limiting the data protection jobs to a single node’s disks. Also, during data restore or when a failed disk is rebuilt, many disks contribute to the workload simultaneously by reading erasure-coded data fragments.
Check out my video showing four concurrent disk failures and NetBackup jobs continuing uninterrupted.
NetBackup Flex Scale uses erasure coding 8:4 to provide the best balance of performance, usable capacity, and data durability:
Next, we need to ensure we are protecting the metadata, in NetBackup Flex Scale’s case this is stored in the catalog on the SSD disks. Here the initial cluster setup automatically configured this such that it is protected not one or two but four different ways:
The NetBackup services are containerized allowing them to be monitored and managed by the built-in cluster management software, InfoScale, which makes them highly resilient by automating their recovery. It works by monitoring the containers, when it detects a container failure, it will first automatically restart it in place, and if that isn’t possible, let’s say because of a node failure, it will be restarted on another node in the cluster. The built-in intelligent load balancer is aware of any cluster changes and automatically updates its algorithms for optimal job distribution.
The nodes themselves have redundant power supplies and two dual-port network adapters. The network cabling connects one port from each NIC to different switches or VLANs for protection against switch failure.
All in all, the NetBackup Flex Scale architecture delivers the enterprise resiliency you need in scale-out data protection solutions.
For more information on NetBackup Flex Scale, check out this white paper or visit the Appliance Solutions page on Veritas.com and watch the recorded NetBackup Flex Scale announcement and technical breakout sessions from the Conquer Every Cloud Virtual Conference.
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