Will SSD replace HDD? -...
Transcript of Will SSD replace HDD? -...
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Will SSD replace HDD?
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SSD vs HDD
HDD the workhorse of data storage
• The battle for storage has been going on for decades with hard disk drives (HDD) dominating because of cost and capacity
‒ Tier 0 is Flash or SSD
‒ Tier 1 is Latency HDD
‒ Tier 2 is Capacity HDD
‒ Tier 3 is tape of virtual tape
• Solid State Disk (SSD) has made incredible gains over the last decade to challenge HDD
‒ Some analysts predict a quick demise of disk drives
• Let’s investigate
SOURCE: HGST
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Two Drive Types
HDD have only moving parts in compute chain besides cooling
• Hard Disk Drives (HDD) are the workhorse of data storage
• Solid State Drives are touted as the revolutionary technology to replaced HDD
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Ways to Compare SSD and HDD
• Capacity
• Cost
• Throughput
• IOPs
• Latency
• Market Share
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HDD Capacity
Capacity Drives often 3.5” while Latency Drives are 2.5”
• HDD Capacity is determined by the Capacity/disk and the number of disks
• HDD can hold up to 10 disks, but usually a few disks
• Each 2.5” disk can support up to 1TB1
• Record currently is 10TB
• 20TB HDD by 20202
SOURCE: 1. HTTP://WWW.STORAGENEWSLETTER.COM/RUBRIQUES/HARD-DISK-DRIVES/GOOD-JOB-FOR-SEAGATE-2-5-INCH-HARD-DISK-PLATTER-AT-1TB/
2. HTTP://WWW.COMPUTERWORLD.COM/ARTICLE/2604311/COMPUTER-HARDWARE/WD-LEAPFROGS-SEAGATE-WITH-WORLD-S-HIGHEST-CAPACITY-10TB-HELIUM-DRIVE-NEW-FLASH-DRIVES.HTML
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3 disks visible
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Flash Chip Capacity Doubling Capacity Every Couple Years
9/17/2015 6
• 3D NAND technology doubling capacity to surpass HDD1
• 48 layer SSD Chip now in development2
1000
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128MB
2000 2010 2020
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>100GB?
1. http://www.pcper.com/reviews/Editorial/Intels-new-3D-NAND-will-cost-less-may-offer-effectively-similar-write-speeds 2. http://www.storagenewsletter.com/rubriques/solid-state-ssd-flash-key/special-report-on-flash-memory-summit-2015/
48 Layer 3D NAND
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SSD Capacity Record
• SSD Capacity is determined by the Capacity/die and the number of die
• SSD can hold up to 500 die1
• Each die can support up to 32GB1
• Record currently is 8TB
• 16TB HDD in 20161
• Surpassing HDD Capacity next year!
SOURCE: 1. HTTP://ARSTECHNICA.COM/GADGETS/2015/08/SAMSUNG-UNVEILS-2-5-INCH-16TB-SSD-THE-WORLDS-LARGEST-HARD-DRIVE//
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14 chips visible Multiple die/chip Up to 500 die/SSD
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Capacity and Cost Comparison
• While SSD is setting records for capacity, most HDD have significantly higher capacity than SSD
• Multi-Terabyte HDD readily available
• Most SSD under 1TB because of cost, but that could change with 32GB dies becoming common next year
‒ 20 32GB chips would give you a 6.4TB SSD
• Where is cost going?
• Amazon search:
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SSD HDD
120GB $48 $20
250GB $98 $22
500GB $165 $49
1TB $345 $53
2TB $79
4TB $135
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IDC Analysis
• The $40/limit has been broken – see previous slide
• SSD is on trajectory to dominate low capacity applications
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Wikibon Analysis
• TCO could be lower with NAND Flash All Flash Arrays (AFA) if you consider the power savings and performance gains due to Flash
• Flash doesn’t need to be limited to SSD
HTTP://WWW.STORAGENEWSLETTER.COM/RUBRIQUES/MARKET-REPORTSRESEARCH/EVOLUTION-OF-ALL-FLASH-ARRAY-ARCHITECTURES/
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Throughput Comparison
Large File Test – Read Write Average Test
• HDD up to 262 MB/s (2 Gb/s) • SSD up to 625MB/s (5 Gb/s)
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Source:http://www.expertreviews.co.uk/storage/internal-hard-drives/1402655/best-hard-drive-2015-the-top-hdds-for-speed-and-price
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625
http://www.expertreviews.co.uk/storage/ssds/1402654/best-ssd-2015-buying-guide-and-all-the-top-picks
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Performance SSD and AFA
• Intel is delivering up to 2.8 GB/s or 22.4 Gb/s on a PCIe SSD
1. HTTP://WWW.INTEL.COM/CONTENT/WWW/US/EN/SOLID-STATE-DRIVES/SOLID-STATE-DRIVES-DC-P3700-SERIES.HTML 12
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IOPS and Latency Comparison
• Disk Drive performance is often measured in Input/Output Operations Per Second (IOPS)
• SSD and All Flash Arrays (AFAs) really shine in the IOPS category
HTTPS://EN.WIKIPEDIA.ORG/WIKI/IOPS
HTTPS://EN.WIKIPEDIA.ORG/WIKI/HARD_DISK_DRIVE_PERFORMANCE_CHARACTERISTICS
• Latency is a key factor that affects IOPS
‒ Seek Latency
‒ Rotational Latency
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HDD SSD AFA
IOPS 100s 1,000s >1,000,000
Seek Latency
0.2-0.8mS 0.1mS 0.1mS
Rotational Latency
2-7 mS 0mS 0mS
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Wikibon Analysis
• Wikibon expects Flash to take over most latency market storage applications over the next few years
• Capacity storage (target of this study group) is expected to be dominated by HDD through 2020
SOURCE: HTTP://WWW.STORAGENEWSLETTER.COM/RUBRIQUES/MARKET-REPORTSRESEARCH/KEY-STORAGE-DIMENSION-LATENCY-VS-CAPACITY-STORAGE/
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Capacity Storage Close-up
HTTP://WIKIBON.COM/THE-STATUS-OF-FLASH-FOR-PRACTITIONERS/
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50% Crossover point in 2020
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• SSD is making great strides in capacity improvements
• Cost/GB still significantly higher for SSD and this study group is targeting capacity markets (low cost/GB)
• HDD should have significant cold storage market share for next several years but it is in a declining market
SSD for Performance, not Capacity
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Thank you