What are two-way restores?
A two-way restore consists of restoring the data to a file server from a locally attached (or SAN-connected) library.
The following restore methods are supported:
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Restoring to the same location on the file server from where the data was backed up.
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Restoring to a different volume or folder on the same file server.
What are three-way restores?
A three-way restore consists of restoring the data to a client that is not directly attached to the backup location. A three-way restore enables more than one file server to share a library, allowing data to be restored to a file server that may not have a locally attached library.
For more information, see Restores to Windows or UNIX Clients.
Can I perform a File System Restore on files with long path names?
Files that have a path length greater than 1024 characters are not indexed during the backup and do not appear during browse operations. To restore these files, you must reduce the length of the restore path by browsing to a directory that is at a higher directory level (parent directory) in the file system.
Can I use a MediaAgent-attached drive pool to restore data that was backed up using an NDMP drive pool?
No. To restore NDMP data, you must use the same drive pool type that you selected during backup. For example, if an NDMP drive pool was used to perform the backup, you should also select an NDMP drive pool during restore.
Can I perform an in-place restore of root volumes for SnapMirror to Tape backups?
No. In-place restores of SnapMirror-To-Tape backups (also referred to as Image Backups) of the root volume on a NetApp file server are not supported. While you can perform a SnapMirror to Tape backup of the root volume, you cannot restore to it because the root volume cannot be turned offline.
Can I perform a direct access restore of an Image backup?
No. The Direct Access Restore option is ignored for restores from image backups. If selected, the option does not affect the restore.
When should I perform a Direct Access Restore?
It is hard to define when a Direct Access Restore provides better performance as each environment is different and has many variables that can affect restore efficiency. Use the following guidelines to determine if this restore operation is appropriate for your environment:
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If the data to be restored is less than 30-40% of the backup, it is recommended to perform a direct access restore.
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For three-way restores, as it involves more overhead processing between the library and the file server, it is recommended to perform a non-direct access restore even if the percentage of the backup being restored is under 30%.
If you are not using direct access restores, restore performance is still optimized where possible. For instance, if the most recent copy of the data that you want to restore was backed up by an incremental or differential backup, the restore only reads the archive file from that differential or incremental backup, instead of reading the archive files back to the last full backup.
Are non-Image browse operations of Celerra data supported for Direct Access Restores?
Yes. Browse operations for EMC Celerra are always non-image browse operations. Even if an image browse is performed, the restore will be a non image restore.