Administrator Guide
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.
Low Priority (Tier 3)
The Low Priority prole provides the most cost ecient storage. Creating a volume using the Low Priority prole stores written
data on Tier 3 RAID 10. Snapshot data is stored on Tier 3 RAID 5/6. Storage Center does not migrate data to higher tiers of storage
unless Tier 3 storage becomes full.
Storage Proles for Flash Optimized Storage
The table below summarizes Storage Proles available for Flash Optimized storage types. Each prole is described in more detail
following the table.
Name
Initial Write Tier Tier (T) and RAID Levels Progression
Low Priority (Tier 3) 3 Writes: T3 RAID 10 snapshots:
T3 RAID 5/6
No
Flash Optimized with
Progression (Tier 1 to All Tiers)
1 Writes: T1 RAID 10 snapshots:
T2/T3 RAID 5/6
Yes to all tiers
Write Intensive (Tier 1) 1 Writes: T1 RAID 10 snapshots:
T1 RAID 10
No
Flash Only with Progression
(Tier 1 to Tier 2)
1 Writes: T1 RAID 10 snapshots:
T2 RAID 5
Yes to Tier 2 only
Low Priority with Progression
(Tier 3 to Tier 2)
3 Writes: T3 RAID 10 snapshots:
T3 RAID 5/6 or T2 RAID 5
Yes to Tier 2 only
Low Priority (Tier 3)
The Low Priority prole provides the most cost ecient storage. Creating a volume using the Low Priority prole stores written
data on Tier 3 RAID 10. Snapshot data is stored on Tier 3 RAID 5/6. Storage Center does not migrate data to higher tiers of storage
unless Tier 3 storage becomes full.
Flash Optimized with Progression (Tier 1 to All Tiers)
The Flash Optimized with Progression Storage Prole provides the most ecient storage for an enclosure containing both read-
intensive and write-intensive SSDs. When a storage type uses this prole, all new data is written to write-intensive Tier 1 drives.
Snapshot data is moved to Tier 2, and less-active data progresses to Tier 3.
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Storage Center Overview