How Next Generation NV Technology Affects Storage Stacks and Architectures
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1 How Next Generation NV Technology Affects Storage Stacks and Architectures Marty Czekalski, Interface and Emerging Architecture Program Manager, Seagate Technology Flash Memory Summit 2013 Santa Clara, CA 1
2 Outline Overview of existing SW stacks and interfaces New NVM devices NVM Programming Models Block, File, Persistent Memory (PM) Technical and Ecosystem Challenges
3 Conventional Storage Architecture Typically File or Virtual IO, Load/Store Very Limited options Logical Block IO Applications New Access Methods IHV Driver OS Stack CPU DRAM Memory Logical Block IO SCSI commands IHV Specific On Motherboard or add in PCIe CEM Card RAID or HBA FW SAS or SATA interface SSD FW Conventional Drive FF and Bays Command, Queuing and DMA engines RAID or JBOD function Flash Translation Layer and Management Physical Block IO Page Read, Page Write, Block Erase RAID Controller Flash SSDs Flash parts PCIe Bus
4 PCIe RAID Aggregation Architecture Typically File or Virtual IO, Load/Store Very Limited options Logical Block IO Applications New Access Methods IHV Driver OS Stack CPU DRAM Memory Logical Block IO SCSI commands IHV Specific RAID FW SAS or SATA interface SSD FW Assembled on a PCIe CEM Card Command, Queuing and DMA engines RAID 0 or 5 function Flash Translation Layer and Management Physical Block IO Page Read, Page Write, Block Erase RAID Controller Flash SSDs Flash parts PCIe Bus
5 On-load SSD Architectures Typically File or Virtual IO, Load/Store More options Logical Block IO Flash Translation Layer and Management Physical Block IO Page Read, Page Write, Block Erase IHV Specific Applications New Access Methods Driver OS Stack Command, Queuing and DMA engines CPU DRAM Memory PCIe Bus Controller PCIe CEM Card or drive FF (Express Bay or SATA Express) Little or no firmware in controller, primarily HW state machines Flash parts
6 NVMe and SCSIe Architectures Typically File or Virtual IO, Load/Store Limited options Logical Block IO Applications New Access Methods Driver OS Stack CPU DRAM Memory Logical Block IO NVMe or SCSI commands NVMe or PQI SSD FW PCIe CEM Card or drive FF (Express Bay or SATA Express) Command, Queuing and DMA engines Flash Translation Layer and Management Physical Block IO Page Read, Page Write, Block Erase Controller Flash parts PCIe Bus
7 Linux IO Stack Applications mmap/malloc VFS (e.g. block, Network,etc) Page cache Block IO Layer (e.g.)optimized Page swap I/O Scheduler SCSI Upper Layer SCSI Mid Layer SCSI Low Layer (IHV provided) IHV Block Driver SCSI Express, NVMe, Proprietary PCIe Device PCIe SSD, RAID Controller, HBA
8 Windows Storage Stack Applications IO Subsystem File System (e.g.ntfs) Volume Snapshot Volume Manager Partition Manager Storage Spaces SW RAID SCSI Class Driver Used for Virtually all Storage Interfaces MPIO Driver Multi-path Storport Storage Driver API IHV Storport Driver SCSI Express, NVMe, Proprietary PCIe Device PCIe SSD, RAID Controller, HBA
9 Promises of new NVM Technologies vs Flash High performance and low cost e.g. Phase Change, Memristor, RRAM Near DRAM performance Dramatically improved endurance Better scalability than current NVM solutions Replacement for flash (when cost/bit is close to parity)
10 NVM Programming Models SNIA TWG (NVMP) preliminary specification, V1.0.0 Revision 5, available on SNIA.org NVM Block Modes Consistent with current block based storage stack architectures, interfaces and protocols Can use flash or new NVM technologies NVM PM Modes Utilizes memory which can be addressed using a load/store model New NVM technologies
11 NVM Block Interfaces Source: SNIA NVM Programming Model V1.0.0 Revision 5
12 NVM Extensions Leverage existing OS system constructs NVM Block Mode and File Mode Extensions Discovery and use of atomic write/read and discard features The discovery of granularities (length or alignment characteristics) Discovery and use of per-block metadata used for verifying integrity Discovery and use of ability for applications or kernel components to mark blocks as unreadable Potential use of memory mapped files
13 Relative Cost vs Time Chart Cost Time
14 NVM Persistent Memory (PM) Memory capable of Load/Store operations Does not cause context switching NV DIMMS today New NVM devices in the future How to utilize PM in systems
15 NVM Persistent Memory (PM)Interfaces Source: SNIA NVM Programming Model V1.0.0 Revision 5
16 Shifting the Persistence Boundary CPU Caches DRAM IO Subsystem Persistence Boundary Storage Persistent Durable Snap Shots Multi Access Access Control Error handling Management Security
17 Shifting the Persistence Boundary CPU Caches DRAM IO Subsystem Storage Persistence Boundary Persistent Durable Snap Shots Multi Access Access Control Error handling Management Security CPU Caches PM IO Subsystem Storage
18 NVM PM Extensions Again, build upon existing OS interfaces NVM PM Volume and PM File extensions Discovery and getting attributes; address ranges, connection channel, etc Memory map (w/options), sync, and discard functions Error handling
19 What s the Right Physical Interface? PCIe Memory mapped IO latency is long compared to the device access time DDR4 Excellent speed but limited configurations and channels Existing virtual memory management assumptions may not map well into PM requirement New Bus Needs to be more expandable Possibility of adding a management layer to better deal with errors and media issue
20 Device Management Endurance Promised to be much better than Flash, but is it good enough? Perhaps for some applications, but not all Will need a high performance virtualization layer Integrate into processor virtual memory architecture Even though devices capable of fine granularity writes, management likely to be memory page granularity or larger Should handle grown defects without rebooting Less frequent and simpler wear leveling approaches needed SW flexibility vs hardware performance ECC Needs to be very low latency, similar to hamming codes May need periodic scrubbing
21 Application adoption Use of these new methods is not transparent to an application E.g. Memory mapped files are not commonly used today Applications need to worry about consistency Cost and multi platform portability will continue to be the key factors in architectural choices Initial adoption by lead users where return is worth the extra effort/competitive edge What features of storage are applications willing to compromise Security concerns
22 Summary Conventional architectures can benefit greatly in performance with new NVM technologies, but will only see adoption when cost is close to Flash New NVM technologies will likely see early adoption as PM, requiring changes to applications and OSs to fully take advantage of performance capabilities 8/14/
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