Administrator Guide

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 ash-optimized storage types. Each prole is described in more detail following
the table.
NOTE
: Flash-optimized storage is available for page pools created using Storage Center 7.1 or later.
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.
If Tier 1 lls to within 95% of capacity, Storage Center creates a space-management snapshot and moves it immediately to Tier 2 to free up
space on Tier 1. The space-management snapshot is moved immediately and does not wait for a scheduled data progression. Space-
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Storage Center Overview