JEDEC JC-64.8 SSD Standards [Compatibility Mode].pdfSSD Definition ‣A solid state drive (SSD) is a...

JEDEC JC-64.8 SSD Standards

Sean In, IndilinxSeptember, 2010

Flash Storage Summits 2010

JEDEC: SSD Standards

‣ JEDEC is leading the industry effort to create a standards framework to facilitate the maximum growth of the SSD market

‣ Areas of focus for JEDEC SSD standards include reliability, endurance and performance requirements


JEDEC SSD Standards: Status‣ Two JEDEC SSD standards are scheduled

for publication this month:– JESDXXX Solid State Drive

Requirements and Endurance Test Method

– JESDXXX Solid State Drive Endurance Workload


JEDEC SSD Standards: Future‣ Work on additional SSD standards and

form factors will continue in JEDEC’s JC-64.8 Subcommittee for Solid State Drives, and in collaboration with other committees and standards organizations


JEDEC SSD Standards: Future‣ JC-64.8 will:− Continue workload development− Investigate read disturb testing− Define power measurement process− Coordinate work with other standards groups− Continue development of SSD form factors− Address additional memory technologies


New JEDEC SSD Standards: Key Topics‣ SSD Requirements

– Definition– Capacity– Application Classes– Endurance Rating– Endurance Verification

‣ SSD Endurance Workloads– Client– Enterprise


SSD Definition‣ A solid state drive (SSD) is a non-volatile

storage device. A controller is included in the device with one or more solid state memory components. The device should use traditional hard disk drive (HDD) interfaces (protocol and physical) and form factors.

‣ Note that interfaces and form factors are not limited to HDD only (“should”)


SSD Capacity‣ SSD Capacity in Gbytes = (User-

addressable LBA count - 21168) / 1953504− Same value as IDEMA for HDDs except

no 50GB limit− Requested by OEMs for ease of

implementation (HDD or SSD)− This version for 512 byte sectors− 4k sector version in development


SSD Application Classes‣ Current application classes:− Client− Enterprise

‣ Application classes attributes:− Workload− Data retention− BER


Endurance Rating‣ Establish a rating system for comparing SSDs‣ Provides unique rating for application class‣ Rating based on a user-measurable interface

activity: TBW‣ TBW = TeraBytes Written

− “Decimal” value to be consistent with user interfaces− Indicates a reference point of nearing 100% P/E cycles

while still meeting BER, data retention, and FFR requirements


SSD endurance classes and rqmts

Application Class

Workload Active Use (power on)

Retention Use

(power off)

Functional Failure

Rqmt (FFR)

UBER

Client Client 40oC8 hrs/day

30oC1 year

≤3% ≤10-15

Enterprise Enterprise 55oC24hrs/day

40oC3 months

≤3% ≤10-16


Endurance Verification‣ Two methods described in the

specification:− Direct− Extrapolation

‣ Direct method runs the SSD to 100% of P/E cycles

‣ Extrapolation method requires:− Knowledge of component characteristics− Information normally available only to the

SSD manufacturerFlash Storage Summits 2010

Endurance Verification‣ Both methods:− Count only failures based on

endurance− Include high and low temperature test

lots− Require sample sizes supporting

established reliability confidence levels


Endurance Workloads‣ Client workload is still under

development− Based on actual captured traces− Capacity scaling method being defined

‣ Enterprise workload specified− Uses 100% of SSD user capacity− No “typical application” allows use of

synthetic trace− Full random data to emulate encryption


Join JEDEC 64.8!‣ Deliver Industry Standards to resolve the

confusion on SSD measurements and concerns about SSD Endurance & Reliability

‣ Join the industry leaders and participate in the JEDEC JC64.8 subcommittee which was established to develop standards for SSDs in cooperation with other subcommittees as well as with external standards organizations


Questions


Thank You


JEDEC JC-64.8 SSD Standards [Compatibility Mode].pdfSSD Definition ‣A solid state drive (SSD) is a...

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