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) A -‐‑‒ ) 81 ( . . 2 Con$idential
0( GIC E Global VM migration is also available by sharing "storage space" by VM host machines. Real time availability makes it possible. Actual data copy follows. (VM operator need virtually common Ethernet segment and fat pipe for memory copy) TOYAMA site OSAKA site TOKYO site before Migration Copy to DR-sites Copy to DR-sites live migration of VM between distributed areas real time and active-active features seem to be just a simple "shared storage". Live migration is also possible between DR sites (it requires common subnet and fat pipe for memory copy, of course) after Migration Copy to DR-sites

23 -‐‑‒ 23 1 1 10 Con$idential . AG
E . C Front-end servers aggregate client requests (READ / WRITE) so that, lots of back-end servers can handle user data in parallel & distributed manner. Both of performance & storage space are scalable, depends on # of servers. front-end (access server) Access Gateway (via NFS, CIFS or similar) clients back-end (core server) WRITE req. write blocks read blocks READ req. scalable performance & scalable storage size by parallel & distributing processing technology

2 -‐‑‒ 55 2 1 1 10 Con$idential .
AI E GC 1. assign a new unique ID for any updated block (to ensure consistency). 2. make replication in local site (for quick ACK) and update meta data. 3. make replication in global distributed environment (for actual data copies). back-end (multi-sites) a file, consisted from many blocks multiplicity in multi-location, makes each user data, redundant in local, at first, 3 distributed copies, at last. (2) create 2 copies in local for each user data, write META data, ant returns ACK (1) (1') (3-a) (3-a) (3-a) make a copy in different location right after ACK. (3-b) remove one of 2 local blocks, in a future. (3-b) (1) assign a new unique ID for any updated block, so that, ID ensures the consistency Most important ! the key for "distributed replication"

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supposed case 5: big and very large slip between a
coast of Shikoku and Kyushu. enter splacement (m) hypocenter displacement (m)

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the Fukushima-1 plant Seismic isolation building Room for operational safety
inspectors Building for training (no power supply for emergency) (1) not connected (1) (2) (3) (2) shut down (loss of power) Fri, 11 Mar. 2011 14:47 +0900 (3) disorder of network lines Fri, 11 Mar. 2011 16:43 +0900 SPDS integrated servers (aggreagte data from plants) Media converter Network switch (firewall) Media converter Uninterruptible power supply Network switch (L3) ERSS computing resources Integrated Nuclear Emergency Preparedness Network Nuclear Emergency Nuclear Emergency SPEEDI System for Prediction of Environmental Emergency Does Information

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DESTCloud now and the future

DESTCloud now and the future

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