--------------------------------------------------
以前 (2010/12/01) 下記に紹介した DRAM構成ストレージの性能が向上しています。
> Xpress Disk (xpd), KOVE
> *)Capacity: 64GB - 1TB per unit, mesh connectable for larger capacities
=>*)Capacity: 64GB - 2TB per unit, mesh connectable for larger capacities
> *)Bandwidth: 20 GB
=>*)Bandwidth: 28.5 GB/sec, consistent and sustainable for any time duration (world record)
> *)IOPS: 600,000 (reads), 500,000 (writes), consistent and sustainable
=>*)IOPS: 11.7 million, consistent and sustainable for any time duration (world record)
> *)Response Time: <25 μS, under load, sustainable and consistent for any
> time duration
=>*)Response Time 6 μS read, 8 μS write consistent and sustainable for any
time duration (world record)
> *)Storage Connectivity
> Fibre Channel: 2,4,8 Gbps
> Infiniband: SDR, DDR, QDR
> *)Storage Ports
> Fibre Channel: Up to 24 ports, 2,4,8 Gbps per port
> Infiniband: Up to 12 ports, SDR, DDR, QDR
等は変わってないようです。
こちらは変わってませんね：
> Texas Memory Systemのメモリー型の最上位機種
> RamSan-440
On Wed, 01 Dec 2010 22:57:49 +0900
--------------------------------------------------
>
> 世の中色々なメーカーがありますね：
>
> "Kove Sets World Record for Sustained Storage Speed with Xpress Disk Gen2
> The industry’s first terabyte memory drive achieves 21 GBytes/sec in
> small 4U chassis."
> November 19, 2010
>
> "has announced the world's first Terabyte Memory Disk in conjunction
> with Mellanox Technologies and R Systems. The Kove Xpress Disk (XPD),
> in combination with Mellanox's ConnectX-240Gb/s InfiniBand, has
> achieved more than 20 GigaBytes per second of sustained data
> bandwidth for random reads and writes."
>
> "These results were achieved using a single Kove XPD Gen2 storage
> appliance equipped with six Mellanox ConnectX-2 40Gb/s InfiniBand
> ports, serving SRP (SCSI RDMA Protocol) storage via an InfiniBand
> fabric to an 11-node cluster. The equipment used during the testing
> process was provided by R Systems."
>
>
> Xpress Disk (xpd), KOVE
> http://www.kove.com/xpress.html
> http://www.kove.com/Kove-XPD2-datasheet.pdf
>
> *)Capacity: 64GB - 1TB per unit, mesh connectable for larger capacities
> *)Bandwidth: 20 GB
> *)IOPS: 600,000 (reads), 500,000 (writes), consistent and sustainable
> *)Response Time: <25 μS, under load, sustainable and consistent for any
> time duration
>
> *)Storage Connectivity
> Fibre Channel: 2,4,8 Gbps
> Infiniband: SDR, DDR, QDR
> *)Storage Ports
> Fibre Channel: Up to 24 ports, 2,4,8 Gbps per port
> Infiniband: Up to 12 ports, SDR, DDR, QDR
>
> *)Data Protection
> Data de-staging from RAM onto persistent media, with multiple,
> user-selected modes
> Integrated instant copying
> Integrated monitoring logic for system health management and UPS
>
> *)Uninterruptible Power Supply (UPS)
> Standard. XPD tightly integrates with UPS, bringing unit down
> gracefully if ever necessary. Integration with centralized UPS
> infrastructure available in some contexts.
>
> *)Health Monitoring
> Device tracks health components for more than 120 monitorables, and
> self-heals for most problems that can occur.
>
> why does KOVE use dram?
> about KOVE
> ※経営陣等の詳細はありません。
>
>
> Texas Memory Systemのメモリー型の最上位機種
> Texas Memory Systemのメモリー型の最上位機種
> RamSan-440
>
> Storage
> *)Capacity: 512 GB
>
> Performance
> *)Maximum Bandwidth: 4,500 MB/s
> *)Read IOPS: 600 K IOPS
> *)Read Latency: 15 microseconds
> *)Write IOPS: 600 K IOPS
> *)Write Latency: 15 microseconds
>
> Interfaces
> *)Expansion Slots: 4 slots
> *)Fibre Channel Ports per Card: 2 ports/card
> *)Fibre Channel Speed per Port: 4 Gb/s
>
> "An In-depth Look at the RamSan-440 Solid State Disk"
> January 2009
> http://www.ramsan.com/files/download/209
> ※↑PDFファイル (17ページ)、内部構成写真等あり
>
> Texas Memory Systems: Current Products
> http://www.ramsan.com/products
>
> どちらも 4Uですが、TMSは 8G FCと InfiniBandに対応してませんね。
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