The document provides an overview of AccelStor and its FlexiRemap technology. It discusses AccelStor's profile as an innovative storage startup and describes its partnership with Boston to produce the Igloo Plus all-flash appliance. It then details FlexiRemap's software-defined approach and its advantages over RAID in maximizing SSD performance, endurance, and lifespan. FlexiRemap's data protection through redundancy is also summarized. Finally, typical applications of the Igloo Plus appliance like virtual machines and databases are briefly outlined.

1. Overview on AccelStor and
FlexiRemap Technology
AccelStor, Inc.
January 20, 2017
Victor Chiang
Senior Sales Manager

2. To accelerate world's information access with innovations in
software technology and solid-state storage

3. Company Profile
• About AccelStor, Inc.
• Established in November 2014
• Management team
• President: Charles Tsai, Ph.D.
• Vice president: Weafon Tsao, Ph.D.
• Office locations
• Headquarters: Taipei City, Taiwan
• Technology center: Hsinchu City, Taiwan
• Website: www.accelstor.com
• One of the 10 Coolest
Storage Startups of Year 2015
• One of the 20 Most Promising HPC
Solution Providers of Year 2016
• One of the 50 Smartest Companies of
the Year 2016
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 3
Source: http://www.crn.com/slide-shows/storage/300077438/the-10-coolest-storage-startups-of-2015-so-far.htm and
http://high-performance-computing.cioreview.com/vendors/most-promising-hpc-solution-providers-2016.html and
http://thesiliconreview.com/magazines/50-smartest-companies-of-the-year-2016/

4. Elements of Datacenter Infrastructures
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 4
Networking Compute StorageStorage
Before Storage = Capacity

5. Elements of Datacenter Infrastructures
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 5
Networking Compute StorageStorage
Now Storage +
Capacity
Tier
=
Performance
Tier

6. Software-Defined All-Flash Arrays
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 6
Flash Storage in
Datacenters
Network-Based
(Shared, Scalable,
Ease of Management)
All-Flash
Array
(AFA)
Advanced
Software Technology
with
Optimized Hardware
Proprietary
Flash
Component
Hybrid Flash
Array
(HFA)
Replacing All
Hard Disks with
Solid-State Drives
Replacing Some
Hard Disks with
Solid-State Drives
Caching
Tiering
Server-Based
Expensive Flash Arrays
Slow Flash Arrays
The Right Way to Go:
Powered by AccelStor
FlexiRemap Technology

7. Partnership between Boston and AccelStor
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 7
Reference : http://www.boston.co.uk/press/2016/06/boston-introduces-the-igloo-plus-1u-all-flash-appliance-with-500k-sustained-iops.aspx

8. Enabling Technology: FlexiRemap
(System-Level Remapping Layer in OS Kernel)
Performance
• Maximizes parallelism by spreading I/O workload across multiple SSDs and results
in linearly scalable I/O performance
• Turns random writes into sequential ones for further increasing I/O performance
Reliability
• Implements flash-optimized journaling for power-loss protection
• Preserves data integrity through redundancy and variable-length stripes, without
penalty of reduced I/O performance and SSD lifespan
• Performs global wear leveling with inter-drive knowledge for higher endurance
• Realizes data-free clone and snapshot via fine-grained, many-to-one data mapping
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 8

9. Advantages of FlexiRemap over RAID
• Compared to conventional RAID configurations:
• Data protection through redundancy, without penalty of reduced performance and
lifespan – particularly important for solid-state drives
• Automatic workload redirection upon drive failure
• Improvement of system lifespan with global wear-leveling
1.5x Difference
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 9
13+ Times
Faster

10. FlexiRemap vs. RAID 5
• Comparisons between FlexiRemap and RAID 5, running on exactly the
same 1U rack-mount platform with 8 standard 2.5" SSDs of 200GB each
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 10
Comparative Metrics FlexiRemap RAID 5
Performance: IOPS for 100% 4KB random writes with iSCSI
over cost-effective, mainstream 10GbE (higher is better)
> 300K IOPS < 32K IOPS
Endurance: Total bytes written before solid-state drives get
worn out (higher is better)
> 4.8PB < 2.8PB
System Lifespan: Sustainability under workload of 3 DWPD
(higher is better)
> 4.5 Years < 1.7 Years
Write Amplification: Ratio of amount of data actually
written to drives over write I/O processed (lower is better)
1.34 2.00

11. Data Protection through Redundancy
• Normal State: Workload Distributed across Both Groups (Not Mirroring)
Hot
Spare
Write I/ORead I/O Read I/O
Protection Group I
(Read/Write)
Parity-Protected
Variable-Length
Data Stripes
Patent Pending
Parity-Protected
Variable-Length
Data Stripes
Protection Group II
(Read/Write)
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 11

12. Data Protection through Redundancy (Cont.)
• Degraded State: Write Requests Redirected to One Group
Hot
Spare
Read I/O Read I/O
Protection Group I
(Read/Write)
Parity-Protected
Variable-Length
Data Stripes
Patent Pending
Write I/O
Parity-Protected
Variable-Length
Data Stripes
Protection Group II
(Read Only)
Rebuilding
Failed Drive
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 12

13. Data Protection through Redundancy (Cont.)
• Recovered State: Seamless Recovery with Automatic Data Rebuilding
Write I/ORead I/O Read I/O
Protection Group I
(Read/Write)
Parity-Protected
Variable-Length
Data Stripes
Patent Pending
Parity-Protected
Variable-Length
Data Stripes
Protection Group II
(Read/Write)
Hot
Spare
Failed Drive
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 13

14. Best-of-Show Award at Flash Memory Summit
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 14
Reference: http://www.flashmemorysummit.com/English/News_Info/BOS_Winners.html

15. Typical Applications
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 15

16. NeoSapphire
All-Flash Array
NeoSapphire
All-Flash Array
NeoSapphire
All-Flash ArrayBoston Igloo Plus
High I/O Performance inside Virtual Machines
Resource Pool
Physical
Node
Physical
Node
Physical
Node
Physical
Node
Physical
Node
Physical
Node
Physical
Node
Physical
Node
iSCSI Volume iSCSI Volume … iSCSI Volume
vCenter Server
Other Resources (Processor, Memory, etc.)
ESXiESXiESXiESXiESXi ESXi ESXi ESXi
vSphere
Client
Superior Storage
Performance inside
Virtual Machines:
50K+ IOPS for 4KB
Random Writes
VM
VM
…
…
VM
VM
VM
VM
VM
VM
VM
VM
VM
VM
VM
VM
VM
VM
iSCSI Target
iSCSI Target
iSCSI Target
iSCSI Target
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 16

17. Database: TPC-C Benchmark
• Oracle Database 12c with
20 Local Hard Disks
• Oracle Database 12c with
Boston Igloo Plus
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 17

18. Improvement over Lustre-Based Applications
AccelStor Confidential – Overview on Boston Igloo Plus All-Flash Appliances 18
15K SAS HDD
16 Nodes
3 Units of
All-Flash Arrays

19. Thank You
Visit us at www.accelstor.com or send your inquiries to inquiry@accelstor.com.