IBM DS8884 Series

Table 24. Drive class combinations and tiers for systems with Flash Tier 0 drives as the highest performance drive
class
Drive classes
Drive class combinations
Flash
Tier 0
Flash
Tier 0
+ Flash
Tier 1
Flash
Tier 0
+ Flash
Tier 2
Flash
Tier 0
+ Flash
Tier 1
+ Flash
Tier 2
Flash
Tier 0
+ Flash
Tier 1
+ Ent
Flash
Tier 0
+ Flash
Tier 2
+ Ent
Flash
Tier 0
+ Flash
Tier 1
+ NL
Flash
Tier 0
+ Flash
Tier 2
+ NL
Flash
Tier 0
+ Ent
Flash
Tier 0
+ Ent +
NL
Flash
Tier 0
+ NL
Flash Tier 0 0 0 0 0 0 0 0 0 0 0 0
Flash Tier 1 1 1 1 1
Flash Tier 2 1 2 1 1
Enterprise
(Ent)
2 2 1 1
Nearline (NL) 2 2 2 1
Table 25. Drive class combinations and tiers for systems with Flash Tier 1 drives as the highest performance drive
class
Drive classes
Drive class combinations
Flash Tier 1
Flash Tier 1
+ Flash Tier
2
Flash Tier 1
+ Flash Tier
2 + Ent
Flash Tier 1
+ Flash Tier
2 + NL
Flash Tier 1
+ Ent
Flash Tier 1
+ Ent + NL
Flash Tier 1
+ NL
Flash Tier 1 0 0 0 0 0 0 0
Flash Tier 2 1 1 1
Enterprise (Ent) 2 1 1
Nearline (NL) 2 2 1
Table 26. Drive class combinations and tiers for systems with Flash Tier 2 drives as the highest performance drive
class
Drive classes
Drive class combinations
Flash Tier 2 Flash Tier 2 + Ent
Flash Tier 2 + Ent +
NL Flash Tier 2 + NL
Flash Tier 2 0 0 0 0
Enterprise (Ent) 1 1
Nearline (NL) 2 1
Table 27. Drive class combinations and tiers for systems with Enterprise or Nearline drives
as the highest performance drive class
Drive classes
Drive class combinations
Ent Ent + NL NL
Enterprise (Ent) 1 1
Nearline (NL) 2 2
Cold demotion
Cold data (or extents) stored on a higher-performance tier is demoted to a
more appropriate tier. Easy Tier is available with two-tier disk-drive pools
and three-tier pools. Sequential bandwidth is moved to the lower tier to
increase the efficient use of your tiers.
Chapter 3. Data management features 63