For detailed information on system limits, refer to the online help or to the Oracle MaxRep for SAN User’s Guide PDF file (search for Range of Field Definitions).
The limits of the Oracle MaxRep for SAN R3.0 are listed in the following table.
| Specification | Limit |
|---|---|
| Replication Engine per configuration | 8 |
| Replication Engine per storage array | 8 |
| Storage arrays per Replication Engine | 8 |
| Replicated LUNs per Replication Engine | 500 |
| LUNs per protection plan | 64 |
| Protection plans per Replication Engine | Unlimited |
| Number of retention LUNs per Replication Engine | 255 |
| Max capacity of each retention LUN | 16.0 TB or 15.6 TiB |
| Daily change rate limit per LUN per Replication Engine - FC | 3.0 TB or 2.9 TiB |
| Daily change rate limit per protection plan per Replication Engine - FC | 3.0 TiB per day |
| Daily change rate limit per Replication Engine - FC | 3.0 TiB per day |
| Application consistency agents per Replication Engine | 96 |
| Virtual snapshots per Replication Engine | 2048 |
| Physical replication copies per Replication Engine | 255 |
The limit on the number of Replication Engines depends upon the configuration. Up to four process service Engines have been tested in non-high availability (NHA) solutions, and up to eight for high availability (HA) solutions.
The maximum number of Replication Engines for each Oracle FS System is eight.
The maximum number of Oracle FS Systems and Pillar Axiom storage arrays for each Replication Engine is eight.
The maximum number of replicated LUNs for FC-attached Engines is 1024.
If only volume replication is being performed, the practical limit is the same as the number of replicated LUNs for each Replication Engine because each protection plan will have at least one LUN. There is no logical limit within the Oracle MaxRep software.
The tested limit of retention LUNs for each Replication Engine is four. Note that each retention LUN used reduces, by one, the available replicated LUNs for that Replication Engine.
Larger file systems are possible by using a larger blocksize; however, serviceability may be an issue. The recommended limit is 16.0 TB or 15.6 TiB.
Daily change rate limits will vary depending upon block sizes and the write access patterns to the source LUN data, the performance capabilities of the target storage, and the available bandwidth between the source and target storage. Listed performance targets might not be met under conditions of highly random small block I/O, or in cases where target storage or bandwidth availability cannot meet the demand of the solution. Highly sequential I/O or I/O with larger block sizes could exceed the listed performance targets.
The maximum number of application consistency agents registered to a Replication Engine is 96.
The tested limit for virtual snapshots is 2048.
Note that the number of physical copies mapped from an Oracle FS System or a Pillar Axiom storage array will limit the number of replication LUNs available for that Replication Engine.