Constantine P Sapuntzakis

US Patent:

7089320, Aug 8, 2006

Filed:

Jun 1, 2001

Appl. No.:

09/872989

Inventors:

Daniel C. Biederman - San Jose CA, US
Vivian W. Chiang - Mountain View CA, US
Jeffrey P. Chou - Foster City CA, US
Malathy Sethuraman - San Jose CA, US
Constantine P. Sapuntzakis - Stanford CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 15/16

US Classification:

709234, 709231, 709232, 709236, 709238

Abstract:

Disclosed are methods and apparatus for combining data segments. At a combiner node, data segments are received from a first node that are destined for a second node. At the combiner node, the received data segments are combined and buffered with previously buffered data segments from the first node if present until a first condition is met. At the combiner node, at least a portion of the combined data segments are sent to the second node when the first condition is met. The received data segments are combined in the combiner node prior to being sent to the second node so as to reduce processing and/or storage resources consumed by the second node.

US Patent:

7373451, May 13, 2008

Filed:

Dec 8, 2004

Appl. No.:

11/007911

Inventors:

Monica Sin-Ling Lam - Menlo Park CA, US
Constantine Paul Sapuntzakis - Mountain View CA, US
Ramesh U. V. Chandra - Palo Alto CA, US
Nickolai Borisovich Zeldovich - Stanford CA, US
Mendel Rosenblum - Stanford CA, US
James Eugene Chow - San Jose CA, US
David James Brumley - Pittsburgh PA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

G06F 12/00

US Classification:

711 6, 709220

Abstract:

A cache-based system management architecture named “the Collective” automates system management and supports mobile computing. The Collective manages systems by manipulating virtual appliances, each encapsulating a system state. A virtual appliance (VA) may comprise a virtual network of VAs. Distributed repositories separately storing the VAs and user data. Publishers create and maintain VAs. A user plugs a bootable portable storage device implementing a VA transceiver (VAT) into a host computer. The VAT, comprising a Manager, a Cache Client, and a virtual machine monitor (VMM), authenticates the user, retrieves a copy of the latest version of a subscribed VA from the appropriate network repository, obtains user data, and automatically backs up the user data over the network in the background while running the subscribed VA. Multiple VAs can be run at the same time. With the novel caching protocol and cache charging process, the Collective performs well and has numerous advantages.

US Patent:

7617290, Nov 10, 2009

Filed:

Jan 6, 2004

Appl. No.:

10/752141

Inventors:

David R. Cheriton - Palo Alto CA, US
Constantine P. Sapuntzakis - Mountain View CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G06F 15/167
G06F 15/16

US Classification:

709212, 709232, 370464, 370471, 370472, 370476, 710 22

Abstract:

A remote DMA (RDMA) shim protocol laid atop an existing network data transfer protocol but logically underneath higher level disk and file access protocols specifies the portion of a data packet to be transferred directly into a separate area of memory such as an application layer memory buffer. This RDMA protocol identifies the area of memory into which the data should be delivered, a data ID, data start, data length or end, and flag bits. Option fields added to (or already present in) the transport protocol describe the RDMA transfer. On reception of a packet specifying RDMA, the receiving device delivers the data directly into the correct memory location using the RDMA description data. In some embodiments of the present invention, the RDMA shim protocol is implemented with TCP options specifically introduced to enable RDMA and thus reduce the overhead of transferring and receiving data with a TCP-based protocol such as NFS or HTTP. Use of a TCP option technique enables the construction of simple hardware accelerators to copy data directly from the incoming packet into application memory buffers, thus avoiding expensive copies within the protocol stack. Alternatively, software techniques may be used to perform direct copying to the application memory buffer.

US Patent:

7849267, Dec 7, 2010

Filed:

Jun 30, 2006

Appl. No.:

11/428008

Inventors:

Monica Sin-Ling Lam - Menlo Park CA, US
Kelvin Yue - Sunnyvale CA, US
Ramesh Chandra - San Mateo CA, US
Constantine P. Sapuntzakis - Mountain View CA, US
John Whaley - San Mateo CA, US
Guy Messalem - Stanford CA, US

Assignee:

moka5, Inc. - Redwood City CA

International Classification:

G06F 12/00

US Classification:

711115, 711165, 709223

Abstract:

Methods and apparatus, including computer program products, for network-extended storage. A portable storage device is coupled to a host computer, and network extension code stored on the portable storage device is invoked. The network extension code is operable to detect a file system write function call generated by an application executing on the host computer, the file system write function call operable to cause data to be written to the portable storage device, and cause the data to be written to the portable storage device based upon the file system write function call. The network extension code is further operable to generate a transmit determination indicative of whether to transmit the data to a network repository, and transmit the data to the network repository based upon the transmit determination.

US Patent:

7890689, Feb 15, 2011

Filed:

Mar 6, 2008

Appl. No.:

12/043672

Inventors:

Monica Sin-Ling Lam - Menlo Park CA, US
Constantine Paul Sapuntzakis - Mountain View CA, US
Ramesh U. V. Chandra - Belmont CA, US
Nickolai Borisovich Zeldovich - Redwood City CA, US
Mendel Rosenblum - Stanford CA, US
James Eugene Chow - San Mateo CA, US
David James Brumley - Pittsburgh CA, US

Assignee:

The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA

International Classification:

G06F 12/00

US Classification:

711 6, 711118, 718 1

Abstract:

Various approaches for virtual appliance management are described. In one approach a virtual appliance repository stores one or more virtual appliances and is coupled to the host computer via a network. A storage device stores a transceiver program capable when executed on said host computer of requesting and receiving the virtual appliances, and generating for each received virtual appliance a respective local copy on the host computer of each received virtual appliance. The local copy is private to the host computer. The transceiver program further binds the virtual appliances to the host computer and obtains user data relevant to the virtual appliances. The transceiver program runs each of the virtual appliances from the respective private local copies on the host computer.

US Patent:

8087017, Dec 27, 2011

Filed:

Apr 9, 2008

Appl. No.:

12/100238

Inventors:

John C. Whaley - San Mateo CA, US
Won-Suk Chun - Manhasset NY, US
Monica Sin-Ling Lam - Menlo Park CA, US
Constantine P. Sapuntzakis - Mountain View CA, US

Assignee:

moka5, Inc. - Redwood City CA

International Classification:

G06F 9/445

US Classification:

718 1, 713187

Abstract:

The disclosed implementations related to prefetching of virtual machines. Some embodiments can receive a virtual disk including a first page table block corresponding to one or more other page table blocks or one or more data blocks. Next, the embodiments can generate a representation of the first page table block, the representation of the first page table block including presence information with respect to the one or more other page table blocks or the one or more data blocks in the virtual disk that are pointed to by the first page table block. The embodiments can then sign the representation of the first page table block. Next, the embodiments can use the signature and the generated position independent representation to verify the integrity of the first page table block, and/or change the offset of the one or more other page table blocks or the one or more data blocks.

US Patent:

8266576, Sep 11, 2012

Filed:

Aug 2, 2007

Appl. No.:

11/833208

Inventors:

Monica Sin-Ling Lam - Menlo Park CA, US
Andrew D. Berkheimer - Boston MA, US
Constantine P. Sapuntzakis - Mountain View CA, US
John C. Whaley - San Mateo CA, US
Ramesh U. V. Chandra - Belmont CA, US
Michael K. Chen - Palo Alto CA, US
Won-Suk Chun - Belmont CA, US
Kelvin Kam-Suen Yue - Sunnyvale CA, US

Assignee:

moka5, Inc. - Redwood City CA

International Classification:

G06F 9/44

US Classification:

717100, 717128, 717131, 717132, 717170, 717177, 709201, 709210

Abstract:

Methods, systems, and apparatus, including computer program apparatus, implementing techniques for publishing, subscribing to, or playing live appliances. A live appliance includes a current virtual machine image. In publishing, a proxy file of a live appliance file type is provided to the publisher. The type is mapped to a live appliance player; so that when a proxy file is opened, the current virtual machine image is run. The player automatically binds a writeable file system external to the virtual machine image to the image to provide file storage that is accessible from within the virtual machine image and from a host operating system. The player also creates a subscription to the live appliance on the host computer if one does not exist when the proxy file is run. With the subscription, the player runs the then-current virtual machine image whenever the live appliance is run.

US Patent:

8484721, Jul 9, 2013

Filed:

Aug 3, 2009

Appl. No.:

12/534699

Inventors:

Monica Sin-Ling Lam - Menlo Park CA, US
Constantine P. Sapuntzakis - Mountain View CA, US

Assignee:

Moka5, Inc. - Redwood City CA

International Classification:

H04L 9/32
G06F 12/00

US Classification:

726 19, 726 16, 711115, 713 2

Abstract:

Some embodiments of the present invention provide a system that presents an alternate computing environment on a host computing device. During operation, this system detects the presence of a removable storage device which is in communication with an interface of the host computing device. The system also locates code which implements the alternate computing environment on the removable storage device. Finally, the system runs the code which presents the alternate computing environment through an environment player on the host device, wherein the environment player prevents a user of the alternate computing environment from interacting directly with a native computing environment of the host computing device.