Administrator Guide
Storage Proles for Standard Storage Types
The table below summarizes the storage proles available for standard storage types. Each prole is described in more detail following the
table.
Name Initial Write Tier Tier (T) and RAID Levels Progression
Recommended (All Tiers) 1 Writes: T1 RAID 10 Snapshots:
RAID 5/RAID 6
Yes - to all Tiers
High Priority (Tier 1) 1 Writes: T1 RAID 10 Snapshots: T1
RAID 5/RAID 6
No
Medium Priority (Tier 2) 2 Writes: T2 RAID 10 Snapshots:
T2 RAID 5/RAID 6
No
Low Priority (Tier 3) 3 Writes: T3 RAID 10 Snapshots:
T3 RAID 5/RAID 6
No
NOTE: The Recommended, High Priority, and Medium Priority proles are not available for the Flash Optimized storage type.
Recommended (All Tiers)
The Recommended storage prole is available only when data progression is licensed. Cost and performance are optimized when all
volumes use the Recommended storage prole. The Recommended prole allows automatic data progression between and across all
storage tiers based on data type and usage.
When a volume uses the Recommended prole, all new data is written to Tier 1 RAID level 10 storage. Data progression moves less active
data to Tier 1 RAID 5/ RAID 6 or a slower tier based on how frequently the data is accessed. In this way, the most active blocks of data
remain on high-performance drives, while less active blocks automatically move to lower-cost, high-capacity SAS drives.
Because SSDs are automatically assigned to Storage Tier 1, proles that include Storage Tier 1 allow volumes to use SSD storage. If you
have volumes that contain data that is not accessed frequently, and do not require the performance of Tier 1 SSDs, use a Medium or Low
Priority prole or create and apply a new prole that does not include Storage Tier 1.
High Priority (Tier 1)
The High Priority storage prole provides the highest performance by storing data on Tier 1. It is ecient in terms of using RAID 5 or 6, but
it uses more expensive media to store the data. A volume created using the High Priority prole stores written data on Tier 1 RAID 10.
Snapshot data is stored on Tier 1 RAID 5/RAID 6. Storage Center does not migrate data to lower storage tiers unless Tier 1 storage
becomes full.
If data progression is not licensed, the default storage prole is High Priority. Without data progression, you must congure volumes to use
a specic tier of storage, because data will not migrate between tiers.
Medium Priority (Tier 2)
The Medium Priority storage prole provides a balance between performance and cost eciency. A volume created using the Medium
Priority prole stores written data on Tier 2 RAID 10. Snapshot data is stored on Tier 2 RAID 5/RAID 6. Storage Center does not migrate
data to other storage tiers unless Tier 2 storage becomes full.
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Storage Center Overview