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, proles 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 Prole or create and apply a new prole that does not include Storage Tier 1.
High Priority (Tier 1)
The High Priority Storage Prole provides the highest performance by storing data on Tier 1. It is ecient 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 prole 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 Prole is High Priority. Without Data Progression, you must congure
volumes to use a specic tier of storage, because data will not migrate between tiers.
Medium Priority (Tier 2)
The Medium Priority Storage Prole provides a balance between performance and cost eciency. A volume created using the
Medium Priority prole 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 prole provides the most cost ecient storage. Creating a volume using the Low Priority prole 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 Proles for Flash Optimized Storage
The table below summarizes Storage Proles available for Flash Optimized storage types. Each prole 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 prole provides the most cost ecient storage. Creating a volume using the Low Priority prole 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 Prole provides the most ecient storage for an enclosure containing both read-
intensive and write-intensive SSDs. When a storage type uses this prole, 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.
66
Storage Center Overview