Join Jia Shi and Gavin Parish for an informal chat about all matters related to Exadata X8M. Learn about Persistent Memory (PMEM) and RDMA over Ethernet (RoCE) and how they integrate into Exadata’s architecture. 0:11 Welcome 1:17 Gavin Parish introduction 1:29 Jia Shi introduction 1:55 Why X8M is a leap in technology 2:15 RDMA over Ethernet (RoCE) in X8M 2:42 InfiniBand and RoCE compared 3:10 Why RoCE replaces InfiniBand in Exadata 3:25 -- Why Exadata adopted InfiniBand 4:30 -- Now Ethernet / RoCE caught up 5:06 -- Cloud factors favoring Ethernet 5:44 -- RoCE advantages summarized 6:32 Benefits of RoCE for Exadata 6:58 -- Context: Exadata vision 7:26 -- RoCE is key to scaling Exadata's shared storage architecture 8:23 -- How RoCE supports shared storage architecture 8:41 -- 3 things that make a good network: 8:46 -- -- (1) low latency (for OLTP) 9:23 -- -- (2) high bandwidth (for Analytics workloads) 10:09 -- -- (3) low latency, high bandwidth but at low/no cost 10:22 -- -- originally only InfiniBand RDMA avoided a lot memory copies, kernel calls, etc. 12:29 Why use RDMA and internal network to communicate with storage 12:44 -- Smart Scan's required RDMA, ruling out storage protocols and plain Ethernet 15:08 RoCE Internal Network Fabric - simple OSI stack, application level uses same RDMA verbs 15:35 Moving to RoCE preserves code and benefits from InfiniBand - and stability! 17:56 Exadata delivers leading edge of technology - not the bleeding edge 21:45 Persistent Memory (PMEM) in Exadata X8M 22:08 -- What PMEM is and 22:45 -- How PMEM fits in the storage hierarchy 24:12 -- PMEM is a new storage tier in Exadata 24:36 -- PMEM is new silicon, not RAM, not Flash 24:54 -- PMEM between RAM and Flash in capacity, performance, and price 25:41 How RoCE and PMEM together lower latency dramatically 27:20 -- in the context of Exadata's architecture 35:17 Putting PMEM as a tier in (shared) storage instead of in disk form factor 36:02 Software is key to Oracle's PMEM technical leadership 36:40 How PMEM and DRAM are used in Exadata Storage Servers 39:34 How would others enable PMEM use / benefits? 41:30 Exadata's architecture adopts and evolves with new technology 41:57 -- adding PMEM is a significant change in the architecture 42:11 -- this is possible because Exadata is database-aware at all levels 42:45 -- for example, storage knows that a write is database log write 43:26 How are Exadata releases done? Why name this X8M and not X9? 45:03 InfiniBand and future versions of Exadata -- we maintain continuity 48:36 -- Same network at the application level 49:06 -- Oracle's own cloud runs multiple generations of Exadata 49:50 End and thanks AskTOM Office Hours offers free, monthly training and tips on how to make the most of Oracle Database, from Oracle product managers, developers and evangelists. https://asktom.oracle.com/ Oracle Developers portal: https://developer.oracle.com/ Sign up for an Oracle Cloud trial: https://cloud.oracle.com/en_US/tryit