IBM DS8880 Series Introduction And Planning Manual page 75

Table 24. Drive class combinations and tiers for systems with Flash Tier 0 drives as the highest performance drive
class
Flash
Drive classes Tier 0
Flash Tier 0 0
Flash Tier 1
Flash Tier 2
Enterprise
(Ent)
Nearline (NL)
Table 25. Drive class combinations and tiers for systems with Flash Tier 1 drives as the highest performance drive
class
Drive classes Flash Tier 1
Flash Tier 1 0
Flash Tier 2
Enterprise (Ent)
Nearline (NL)
Table 26. Drive class combinations and tiers for systems with Flash Tier 2 drives as the highest performance drive
class
Drive classes Flash Tier 2
Flash Tier 2 0
Enterprise (Ent)
Nearline (NL)
Table 27. Drive class combinations and tiers for systems with Enterprise or Nearline drives
as the highest performance drive class
Drive classes
Enterprise (Ent)
Nearline (NL)
Cold demotion
Flash
Tier 0
Flash Flash + Flash
Tier 0 Tier 0 Tier 1
+ Flash + Flash + Flash
Tier 1 Tier 2 Tier 2
0 0 0
1 1
1 2
Flash Tier 1 Flash Tier 1
+ Flash Tier + Flash Tier
2 2 + Ent
0 0
1 1
2
Flash Tier 2 + Ent
0
1
Ent
1
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.
Drive class combinations
Flash Flash Flash
Tier 0 Tier 0 Tier 0
+ Flash + Flash + Flash
Tier 1 Tier 2 Tier 1
+ Ent + Ent + NL
0 0 0
1 1
1
2 2
2
Drive class combinations
Flash Tier 1
+ Flash Tier Flash Tier 1
2 + NL + Ent
0 0
1
1
2
Drive class combinations
Flash Tier 2 + Ent +
NL
0
1
2
Drive class combinations
Ent + NL
1
2
Chapter 3. Data management features
Flash
Tier 0 Flash
+ Flash Flash Tier 0
Tier 2 Tier 0 + Ent +
+ NL + Ent NL
0 0 0
1
1 1
2 2
Flash Tier 1 Flash Tier 1
+ Ent + NL + NL
0 0
1
2 1
Flash Tier 2 + NL
0
1
NL
2
Flash
Tier 0
+ NL
0
1
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