Consider the following recommendations to optimize
OneFS NDMP backups.
General performance recommendations
Install the latest patches for
OneFS and your data management application (DMA).
To obtain optimal throughput per session, Dell Technologies recommends not to run the maximum number of NDMP concurrent sessions which is eight per Fibre Attached Storage node.
NDMP backups result in very high Recovery Point Objectives (RPOs) and Recovery Time Objectives (RTOs). You can reduce your RPO and RTO by attaching one or more Fibre Attached Storage nodes to the cluster and then running two-way NDMP backups.
The throughput for a
PowerScale cluster during the backup and recovery operations is dependent on the dataset and is considerably reduced for small files and deep directory structures (>13).
If you are backing up large numbers of small files, set up a separate schedule for each directory.
If you are performing NDMP three-way backups, run multiple NDMP sessions on multiple nodes in your
PowerScale cluster.
Recover files through Directory DAR (DDAR) if you recover large numbers of files frequently.
Use the largest tape record size available for your version of
OneFS to increase throughput.
If possible, do not include or exclude files from backup. Including or excluding files can affect backup performance, due to filtering overhead.
SmartConnect recommendations
A two-way NDMP backup session with SmartConnect requires Fibre Attached Storage node for backup and recovery operations. However, a three-way NDMP session with SmartConnect does not require Fibre Attached Storage nodes for these operations.
For a NDMP two-way backup session with SmartConnect, connect to the NDMP session through a dedicated SmartConnect zone consisting of a pool of Network Interface Cards (NICs) on the Fibre Attached Storage nodes.
For a two-way NDMP backup session without SmartConnect, initiate the backup session through a static IP address or fully qualified domain name of the Fibre Attached Storage node.
For a three-way NDMP backup operation, the front-end Ethernet network or the interfaces of the nodes are used to serve the backup traffic. Therefore, it is recommended that you configure a DMA to initiate an NDMP session only using the nodes that are not already overburdened serving other workloads or connections.
Fibre Attached Storage recommendations
Assign static IP addresses to Fibre Attached Storage nodes.
Attach more Fibre Attached Storage nodes to larger clusters. The recommended number of Fibre Attached Storage nodes is listed in the following table.
Table 1. Nodes per Fibre Attached Storage node
Node type
Recommended number of nodes per Fibre Attached Storage node
X-Series
3
NL-Series
3
S-Series
3
HD-Series
3
Attach more Fibre Attached Storage nodes if you are backing up to more tape devices.
DMA-specific recommendations
Enable parallelism for the DMA if the DMA supports this option. This allows
OneFS to back up data to multiple tape devices at the same time.
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