Chapter 3 - Understanding Spectra Advanced Bucket Management Concepts
Data Policies
Data Persistence Rules
Each data policy must have one or more permanent persistence rules. Each persistence rule
targets a specified storage domain. There are three types of persistence rules:
•
Permanent
— A copy of the data is placed in the specified storage domain initially
and maintained there permanently.
•
Temporary
— A copy of the data is placed in the specified storage domain initially
and maintained there at least until the specified retention period expires.
•
Retired
— The rule is not applied for any new incoming data, but continues to retain
data previously written.
Data is written to every storage domain for which there is a persistence rule with the type
configured as permanent or temporary.
The same storage domain cannot be specified multiple times using different persistence
rules in the same data policy. The same storage domain can be referred to across different
data policies.
Data persistence rules must specify the level of physical isolation required for the data
retention. There are two types of data retention:
•
Standard
— Data is isolated according to the standard storage domain isolation
requirements. When more storage is needed, a tape or pool is assigned to the storage
domain. Any buckets using that storage domain can have data on the pool or tape,
which can make it difficult to eject all of the tapes for a single bucket.
•
Bucket Isolated
— Data from different buckets cannot be mixed on the same physical
storage media.
Notes:
• The
Standard
isolation level provides the best capacity utilization and overall
performance.
•
Bucket Isolated
allocates an entire tape or pool to a bucket when needed.
Allocating an entire pool to a bucket may use up resources quickly and is not
recommended.
November 2020
User Guide-BlackPearl Converged Storage System
- 70 -
