* Posts by Cesar Maciel

3 posts • joined 30 Apr 2009

Storage upstart: Our flashy gear is WAY faster than slow old DRAM

Cesar Maciel

Seems an idea similar to the IBM POWER8 CAPI Flash solution

The IBM Data Engine for NoSQL, based on POWER8, a PCIe FPGA accelerator from Nallatech that is connected through a coherent interface called CAPI, and the Redis NoSQL database, delivers the same combination of fast DRAM and cheap Flash seen as DRAM. The FPGA maps the Flash as a memory block for the redis database to use, using key value store operations. The CAPI interface allows the accelerator to participate in the coherency domain of the processors - in other words, it can directly access main memory, without requiring system-to-device memory copy that is common in accelerators that are seen as I/O devices.

Since Flash is cheaper than DRAM, you can have lots of memory on small servers at an affordable pricing. The S822L supports two IBM FlashSystem 900 connected as "real memory", for a total of 114 TB of "RAM" - on a 2U system. The Redis SW can mange DRAM and Flash for optimizing response time requirements, and the solution offers an attractive balance between performance, cost, and simplicity.

There is a paper describing CAPI and the NoSQL solution with POWER8 at http://www-03.ibm.com/systems/power/solutions/bigdata-analytics/data-engine-nosql/

Cesar

Disclaimer: I work for IBM. This comment is my own opinion and may not represent IBM's position or statements.

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Oracle plops true live migration onto SPARC hypervisor

Cesar Maciel

Max number of partitions on IBM Power Systems

PowerVM was enhanced in April 2011 to support up to 320 partitions on the Power 750, 640 partitions on the Power 770 and 780 and up to 1000 partitions on the Power 795.

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IBM slips Power6+ into racks, blades

Cesar Maciel

Minor Corrections

Very nice article, but there are a few incorrect details, as follows:

1 - The Power 520 and 550 have had 2.5" SFF SAS disks for a while, and SSD disks have just been announced, as shown in http://www-03.ibm.com/systems/power/hardware/520/specs.html

2 - The Power 595 has the same 32MB L3 cache per POWER6 chip as the smaller systems, as shown in http://www-03.ibm.com/systems/power/hardware/595/specs.html . What's different between the smaller systems and the 595 is that the 32MB L3 cache on the lower systems is a single 32MB DRAM chip, while on the 595 it is split into two 16MB DRAM chips. That doubles the number of buses used for L3 cache I/O, therefore doubling bandwidth, as described in http://www.research.ibm.com/journal/rd/516/le.html

Regards

Cesar

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