This document describes limitations on CFS snapshots to help you use snapshotting more efficiently.
Item | Usage Limits |
The number of snapshots | Each file system can have up to 100 snapshots |
Number of scheduled snapshot policies | 30 |
Number of file systems that can be bound to a scheduled snapshot policy | 200 |
Supported file system type | StandardHigh-Performance |
File system snapshots can be created by using either of the following methods: Copy-On-Write (COW) and Redirect-On-Write (ROW).
If the snapshot status of a file system is Migrating, the snapshot of the file system has been taken (metadata captured and original file system data marked), and the migration is taking place.
During snapshot migration, the file system can be used properly. You can overwrite, modify, and delete files in the file system without affecting snapshot data migration nor causing snapshot file loss.
Creating the first snapshot for a file system may take a while as all data in the file system needs to be migrated, and follow-up snapshots are faster to create, because they are incremental or differential backups.
During snapshot migration, the I/O performance of the file system may decrease by about 15%. You are advised to configure scheduled snapshot policies and take snapshots during off-peak hours of businesses.