Architectural Principles for Networked Solid State Storage Access
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1 Architectural Principles for Networked Solid State Storage Access
2 SNIA Legal Notice! The material contained in this tutorial is copyrighted by the SNIA unless otherwise noted.! Member companies and individual members may use this material in presentations and literature under the following conditions:! Any slide or slides used must be reproduced in their entirety without modification! The SNIA must be acknowledged as the source of any material used in the body of any document containing material from these presentations.! This presentation is a project of the SNIA Education Committee.! Neither the author nor the presenter is an attorney and nothing in this presentation is intended to be, or should be construed as legal advice or an opinion of counsel. If you need legal advice or a legal opinion please contact your attorney.! The information presented herein represents the author's personal opinion and current understanding of the relevant issues involved. The author, the presenter, and the SNIA do not assume any responsibility or liability for damages arising out of any reliance on or use of this information. NO WARRANTIES, EXPRESS OR IMPLIED. USE AT YOUR OWN RISK.
3 Who We Are Doug Voigt Chair, NVM Programming Model, SNIA Technical Council Distinguished Technologist, HPE J Metz SNIA Board of Directors R&D Engineer Cisco 3
4 Focus on Principles! Technical and market dynamics are creating complexity! Permutations of technologies and positioning! Intricacies of new technology integration! Foundational principles have not changed! Application views of memory and storage! The role of data access time (latency) in system architecture! Principles transcend details! This is not a best practices presentation! This is presentation does not report benchmark results 4
5 Times are changing! Storage access times are shrinking! Emerging persistent memory (PM) technologies! Faster than flash! Interconnects are getting faster! Bandwidth! Latency! Creating challenges for software! Software stacks are starting to dominate latency! Trigger for a fundamental architecture shift 5
6 Principles we will cover today! Application view I/O vs. Load/Store (Ld/St)! Disruption caused by latency! Persistence domains! Latency impact of remote persistence 6
7 Application View
8 Input/Output (IO)! is read or written using RAM buffers! Software has control over how to wait! Poll! Context switch! Status is explicitly checked by software 8
9 What is IO? Software RAM Controller Media Create RAM buffer Buffer IO copies data between RAM and Disk (HDD: Hard Disk Drive, SSD: Solid State Disk) SSD/ HDD 9
10 What is IO? Software RAM Controller Media Create RAM buffer Put command in RAM (NVMe, SATA, SCSI) Send command Storage stack software creates a command and sends it to a disk Buffer Command Receive Command SSD/ HDD 10
11 What is IO? Software RAM Controller Media Create RAM buffer Put command in RAM (NVMe, SCSI) Buffer Send command Command Wait for completion (Context Switch or Poll) Poll: thread stays busy -or- Context Switch: thread releases processor Receive Command Copy SSD/ HDD 11
12 What is IO? Software RAM Controller Media Create RAM buffer Put command in RAM (NVMe, SCSI) Send command Disk drive sends status message upon completion Check status in RAM Buffer Command Status Receive Command Copy Send Status For more on latency and throughput see: SSD/ HDD 12
13 What is IO? Software RAM Controller Media 2uS 100 ms Create RAM buffer Put command in RAM (NVMe, SCSI) Send command Check status in RAM Buffer Command Range of IO latency Lower bound: single threaded SSD Upper bound: multi-threaded HDD Status Receive Command Copy Send Status For more on latency and throughput see: SSD/ HDD 13
14 What is IO? Software RAM Controller Media Create RAM buffer Put command in RAM (NVMe, SCSI) Buffer Send command Command 2uS 100 ms Wait for completion (Context Switch or Poll) Check status in RAM Status Receive Command Copy Send Status SSD/ HDD 14
15 Enter Persistent Memory! Much faster than flash alone! Available today in the form of an NVDIMM! Can be used to store application data structures! Software uses Pmalloc (Persistent Memory Allocation) to allocate a region of persistent memory! Accessed by processor instructions like any other memory 15
16 Load/Store (Ld/St)! Load and Store are processor instructions! Generated by compliers to access memory! Proxy for any processor instruction that accesses memory! is loaded into or stored from processor registers! Software may be forced wait for data during an instruction! The thread is busy! The processor won t let the thread do anything else! No status checking errors generate exceptions 16
17 What is Ld/St? Software Pmalloc memory Processor Registers Processor Cache Media Pmalloc returns persistent memory (PM) where software data structures can be permanently stored. 17
18 What is Ld/St? < 200 ns Software Pmalloc memory Load Processor Registers Address Processor Cache A load (Ld) instruction fetches data from RAM into a processor register and may keep a copy in cache. This normally takes less than 200 ns. & Ack Media 18
19 What is Ld/St? Software Pmalloc memory Load Processor Registers Address Processor Cache Media Manipulate Registers & Ack Store Applications manipulate registers and use store (St) instructions to send data into processor cache. 19
20 What is Ld/St? Software Pmalloc memory Load Processor Registers Address Processor Cache Media Manipulate Registers & Ack Store Eventually the processor will flush data out of its cache. Address & 20
21 What is Ld/St? Software Pmalloc memory Load Processor Registers Address Processor Cache Media Manipulate Registers & Ack Store Sync/Flush Flush If the application cares about persistence it must force a flush Address & Ack 21
22 What is Ld/St? < 200 ns Software Pmalloc memory Load Manipulate Registers Processor Registers Address Processor Cache & Ack Media Store Sync/Flush Flush Address & Ack 22
23 Compare and Contrast Application View! IO! is read or written using RAM buffers! Software has control over how to wait (context switch or poll)! Status is explicitly checked by software! Ld/St! is loaded into or stored from processor registers! Software is forced by processor to wait for data during instruction! No status checking errors generate exceptions 23
24 Ld/St and memory mapping! Memory mapped IO! PCIe card registers are given memory addresses! Ld/St is used to access those registers! Designed for use to control IO (or other) card functions! Memory mapped files! stored in files (in PM) is given memory addresses! Ld/St is used to manipulate user data! Must flush after St to assure persistence 24
25 Latency Is The Disrupter
26 Compare and Contrast Technology View Key Question: Is it OK to force the CPU memory access pipeline to wait for a given storage or memory access to complete before proceeding?! May pause a thread in the middle of executing an instruction! May block reads and writes to all cores 26
27 When does latency fit into a Ld/St Budget? Key Question: Is it OK to force the CPU memory access pipeline to wait for a given storage or memory access to complete before proceeding?! May pause a thread in the middle of executing an instruction! May block reads and writes to all cores Technology DDR Connect Mem Mapped PCIe PCIe I/O Network (IB/Enet/FC) RAM Yes Maybe No No Battery+RAM Yes Maybe No No PM Yes Maybe No No Flash Sometimes Sometimes No No Rotating NA NA No No 27
28 Sometimes??!!! Flash write latency generally does not fit in Ld/St Budget! Write process takes much longer than a St! Long latency tail due to erase cycle, garbage collection! Flash read latency interference from controller! Erase cycle/wear leveling forces block granularity indexing! Index traversal at SSD scale would stress Ld/St latency budget! Flash with cache! Makes latency unpredictable! Is cache non-volatile? Hold that thought 28
29 Latency Thresholds Cause Disruption Latency (Log) 2 us 200 ns Min, Max Latencies For Example Technologies Context Switch NUMA * IO Ld/St HDD SATA SSD NVMe Flash Persistent Memory * Non Uniform Memory Access 29
30 Persistence Domains
31 What is a persistence domain?! A place that retains data during power loss! Because it is inherently non-volatile! Because it is flushed during or after power loss! Examples:! A group of flash or PM devices! An NVDIMM! A group of RAM devices that are powered by a battery! (part of) A controller that flushes caches and RAM to an SSD! With battery power! With capacitance 31
32 Examples of Persistence Domains RAM CPU NVDIMM PCIe SSD/ HDD! Requires Flush-On-Demand! Explicit flush by application or library! Disrupts CPU Caches Disk Array Controller RAM CPU PCIe SSD/ HDD! Enables Flush-On-Fail! Everything is saved after power loss! We re gonna need a bigger battery 32
33 Interconnect Latency
34 What about remote persistence domains? Application flush( ); RAM CPU PCIe Network Adapter Network Network Adapter PCIe RAM CPU! Network Latency Disruption SSD/ HDD NVDIMM! Most of today s networks do not approach Ld/St timescales.! The fastest port to port times for IB and projected Omnipath technologies might fit within a Ld/St budget! RDMA helps by eliminating round trips and software overhead! BUT For more on RDMA see: 34
35 What about remote persistence domains? Application flush( ); RAM CPU PCIe Network Adapter Network Network Adapter PCIe RAM CPU! Network Latency Disruption! There is no hardware flush action over PCI SSD/ HDD NVDIMM! AND there is no RDMA completion that indicates persistence! SO software is involved at the remote node 35
36 So How About This? Application write( ); RAM CPU PCIe Network Adapter Network Network Adapter PCIe RAM CPU! OK, but its not Ld/St! Avoids remote processor! Minimal remote latency for IO SSD/ HDD NVDIMM 36
37 Or This? Application flush( ); RAM CPU PCIe Network Adapter Network Network Adapter PCIe RAM CPU! Remote Flush on Fail SSD/ HDD! This is how inter-controller links on disk arrays work.! But it is still very difficult to get sync anywhere near Ld/St latency! especially across blades or chassis! or with routing! AND remember, the remote write is on flush, not St. 37
38 Current Industry Challenge Bring remote flush latency much closer to Ld/St time! Effects all of the elements in the system! Processor! NIC! Persistence Domain! Lots of activity is happening so stay tuned 38
39 NVM Programming Model TWG work One important use case is described by SNIA s new NVM PM Remote Access for High Availability paper! Taxonomy of local and remote use cases! Application recoverability requirements! Model and requirements for remote implementations of optimized flush as described in the SNIA NVM Programming Model 39
40 After This Webcast! Please rate this Webcast and provide us with feedback! This Webcast and a PDF of the slides will be posted to the SNIA Ethernet Storage Forum (ESF) website and available on-demand! A full Q&A from this webcast, including answers to questions we couldn't get to today, will be posted to the SNIA-ESF blog! Follow us on SNIAESF 40
41 Architectural Principles for Networked Solid State Storage Access
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