General performance recommendations
- Install the latest patches for OneFS and your data management application (DMA).
- Run a maximum of eight NDMP concurrent sessions per A100 Backup Accelerator node and four NDMP concurrent sessions per Isilon IQ Backup Accelerator node to obtain optimal throughput per session.
- 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 Backup Accelerator nodes to the cluster and then running two-way NDMP backups.
- The throughput for an Isilon cluster during the backup and recovery operations is dependent on the dataset and is considerably reduced for small files.
- 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 Isilon cluster.
- Recover files through Direct Access Restore (DAR), especially if you recover files frequently. However, it is recommended that you do not use DAR to recover a full backup or a large number of files, as DAR is better suited to restoring smaller numbers of files.
- 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.
- Limit the depth of nested subdirectories in your file system.
- Limit the number of files in a directory. Distribute files across multiple directories instead of including a large number of files in a single directory.
- A two-way NDMP backup session with SmartConnect requires backup accelerators for backup and recovery operations. However, a three-way NDMP session with SmartConnect does not require backup accelerators 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 backup accelerator 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 backup accelerator 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.
- For a three-way NDMP backup operation with or without SmartConnect, initiate the backup session using the IP addresses of the nodes that are identified for running the NDMP sessions.
Backup Accelerator recommendations
- Assign static IP addresses to Backup Accelerator nodes.
- Attach more Backup Accelerator nodes to larger clusters. The recommended number of Backup Accelerator nodes is listed in the following table.
Table 1. Nodes per Backup Accelerator nodeNode typeRecommended number of nodes per Backup Accelerator nodeX-Series3NL-Series3S-Series3HD-Series3
- Attach more Backup Accelerator nodes if you are backing up to more tape devices.
- 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.