JEDEC JESD219A-2012 Solid-State Drive (SSD) Endurance Workloads.pdf
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1、JEDEC STANDARD Solid-State Drive (SSD) Endurance Workloads JESD219A (Revision of JESD219, September 2010) JULY 2012 JEDEC SOLID STATE TECHNOLOGY ASSOCIATION NOTICE JEDEC standards and publications contain material that has been prepared, reviewed, and approved through the JEDEC Board of Directors le
2、vel and subsequently reviewed and approved by the JEDEC legal counsel. JEDEC standards and publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the
3、 purchaser in selecting and obtaining with minimum delay the proper product for use by those other than JEDEC members, whether the standard is to be used either domestically or internationally. JEDEC standards and publications are adopted without regard to whether or not their adoption may involve p
4、atents or articles, materials, or processes. By such action JEDEC does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the JEDEC standards or publications. The information included in JEDEC standards and publications represents a sound app
5、roach to product specification and application, principally from the solid state device manufacturer viewpoint. Within the JEDEC organization there are procedures whereby a JEDEC standard or publication may be further processed and ultimately become an ANSI standard. No claims to be in conformance w
6、ith this standard may be made unless all requirements stated in the standard are met. Inquiries, comments, and suggestions relative to the content of this JEDEC standard or publication should be addressed to JEDEC at the address below, or refer to www.jedec.org under Standards and Documents for alte
7、rnative contact information. Published by JEDEC Solid State Technology Association 2012 3103 North 10th Street Suite 240 South Arlington, VA 22201-2107 This document may be downloaded free of charge; however JEDEC retains the copyright on this material. By downloading this file the individual agrees
8、 not to charge for or resell the resulting material. PRICE: Contact JEDEC Printed in the U.S.A. All rights reserved PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by JEDEC and may not be reproduced without permission. For information, contact: JEDEC Solid State Technology Association 310
9、3 North 10th Street Suite 240 South Arlington, VA 22201-2107 or refer to www.jedec.org under Standards-Documents/Copyright Information. JEDEC Standard No. 219A Page 1 SOLID STATE DRIVE (SSD) ENDURANCE WORKLOADS (From JEDEC Board Ballot, JCB-12-16, formulated under the cognizance of the JC-64.8 Subco
10、mmittee on Solid-State Drives.) 1 Scope This standard defines workloads for the endurance rating and endurance verification of SSD application classes. These workloads shall be used in conjunction with the Solid State Drive (SSD) Requirements and Endurance Test Method standard, JESD218. 2 Reference
11、documents JESD218, Solid State Drive (SSD) Requirements and Endurance Test Method 3 Terms and definitions cluster: The minimum # of contiguous LBAs allocated by the host operating system. Cold LBA Range: An LBA Range not referenced by a write or trim in a trace. command trace: A trace of I/O command
12、s. compression: The process of scaling LBAs associated with commands in the Master Trace to produce a Test Trace with a smaller LBA Range. entropy: The non-compressibility of a data pattern when in file format such that 100% entropy has no reduction in file size and 50% entropy has approximately a 5
13、0% reduction in file size when converting to a zip file. expansion: The process of scaling LBAs associated with commands in the Master Trace to produce a Test Trace with a larger LBA Range. footprint: A set of LBAs. Free LBA Space: A set of LBAs within LBA Address Space, which are not currently allo
14、cated for data storage by the host OS. LBA Address Space: The full set of user addressable LBAs on the device. LBA Range: The set of contiguous LBA addresses bounded by the lowest and highest LBA of an addressed structure. Maximum LBA: A value specifying the LBA number corresponding to the last LBA
15、in the LBA Address Space. Master Trace: A command trace typical of a period of continuous drive operation in a typical client environment, from which Test Traces are derived. JEDEC Standard No. 219 Page 2 3 Terms and definitions (contd) PreCond%full: The % of clusters in LBA Address Space that are a
16、ssigned to valid data on the device under test by the preconditioning process. SSD_Capacity: See JESD218. Test Trace: A command trace comprising I/O operations to a drive under test that is run during the test phase of a client workload. Trim: A command from the host that identifies data that is no
17、longer used by the operating system, allowing the memory space to be considered Free LBA Space by the drive. 4 Enterprise endurance workload The enterprise endurance workload consists of random data distributed across an SSD in a manner similar to some enterprise workload traces that are publicly av
18、ailable for review. Prior to running the workload, the SSD under test shall have the user-addressable LBA space filled with valid data (e.g., the drive does not return a data read error because of the content of the LBA prior to being written during the test routine). Initialization may not be neces
19、sary if the formatted SSD satisfies this requirement. a) The enterprise endurance workload shall be comprised of random data with the following payload size distribution: 512 bytes (0.5K) 4% 1024 bytes (1K) 1% 1536 bytes (1.5K) 1% 2048 bytes (2K) 1% 2560 bytes (2.5K) 1% 3072 bytes (3K) 1% 3584 bytes
20、 (3.5K) 1% 4096 bytes (4K) 67% 8192 bytes (8K) 10% 16,384 bytes (16K) 7% 32,768 bytes (32K) 3% 65,536 bytes (64K) 3% b) The data payloads greater than or equal to 4096 bytes data payload sizes shall be arranged such that the data payloads less than 4096 bytes are pseudo randomized among the data pay
21、loads greater than or equal to 4096 bytes. Data payloads greater than or equal to 4096 bytes are aligned on 4K boundaries. JEDEC Standard No. 219A Page 3 4 Enterprise endurance workload (contd) c) The workload shall be distributed across the SSD such that the following is achieved: 1) 50% of accesse
22、s to first 5% of user LBA space (LBA group a) 2) 30% of accesses to next 15% of user LBA space (LBA group b) 3) 20% of accesses to remainder of user LBA space (LBA group c) d) To avoid testing only a particular area of the SSD, the distribution described in c) is offset through the user LBA space on
23、 different units under test such that all of the SSD LBAs are subjected to the highest number of accesses (e.g., SSD 1 has LBA group a applied to the first 5% of LBAs, SSD 2 has LBA group a applied to the next 5% of LBAs, etc). e) The write data payload size distribution shall be applied to each of
24、the three LBA groups concurrently. The write sequence across the LBA groups may be applied in either a deterministic fashion or randomly, depending on the capabilities of the test tools, so long as the percentage of accesses to each LBA group conforms to those specified in 4c and the LBA access shal
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