Adaptec ASR-6405T Manuel d'utilisateur télécharger pdf (Page 23)

USE CASE: USING A SMARTHBA AS A DRAM CACHE

USING DRAM+ZMCP TO DE-MANGLE THE I/O PATTERNS, REDUCE

LATENCY

Runs in user space

Highly optimized

Highly

optimized

Contains all significant IP

May need to “flush” frequently

timized for “

eneric” a

lications

pgpp,

not the one that’s running

Enforces semantics that probably do

more than the application needs

File

System

Optimized for “generic” applications

Often bypassed by apps (“direct I/O”)

“Absorbs” I/O from the host with a mix of

patterns caused by the application and the

Buffer

Cache

Code here to pulls data from the DRAM

cache in a manner optimized for the disks,

patterns

caused

the

application

and

the

O/S layers

HBA mode I/O path

Cl“ ”f

regardless of the I/O pattern produced by the

upper layers

omp

“

mess

”

interleaved patterns

Proprietary and ConfidentialProprietary and Confidential

Non-RAID application, so nothing but

disks exposed by the storage layer

SmartHBA mode I/O path

Optimized for throughput or latency

Disks

HBA

differentiator

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Adaptec ASR-6405T Manuel d'utilisateur Page 23

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