Resume of Radek Aster 

Data Domain Inc.,  Palo Alto, CA

• Responsible for all storage related software of the Data Domain product.
• Linux kernel (2.4.18) block and raw drivers, SCSI layer drivers, 3Ware (7506-8) PCI-PATA host adapter driver, QLogic 2312 FC host adapter driver.
  
• Developed application level "Disk Spares Handler" to work in conjuction with Linux md (Multi-disk Driver) driver to provide for automatic failed disk replacement and global spares management.
  
• Developed application level "Resource Manager", a hardware resource abstraction layer. Provided a standard interface to all system/platform hardware resources.
  
• Developed a Data Domain specific Linux kernel driver module for a Micro-Memory NVRAM card (MM-5435); provided for arbitrary length DMA and PIO access.
  

OnStor Inc. (aka Agile Storage Inc., aka ClariStor),  Los Gatos, CA

• Responsible for design and specification for large parts of core I/O software for a message passing multi-processor platform. Objectives were
• encapsulating large block SCSI I/Os with required guaranteed delivery, to a unreliable, small packet, physical layer switching back plane.
• I/O multi-path for fail over, static load balancing, and FC-level trunking.
• dynamic discovery of device addition and removal; event driven state change notification to clients.
• full support for FC-SAN fabric attached disk and tape devices.
• Support for end-to-end checksumming ("checksum-with-data") for silent data corruption detection.
• Developed logical architecture for mapping NDMP v.3  (network filesystem backup) spec. to multi-processor, message passing platform.
• Fully developed QLogic ISP2310 PCI-FC host adapter driver, supporting loop, point-to-point and fabric.
• Developed parts of Storage Device Manager; device initialization, multi-path management, path fail over.
• Fully developed tape device "class" driver.
• Developed portions of disk "class" driver, supporting I/O optimization, coalescing, prioritization, "checksum-with-data".
• Developed fragmenting/reassembling, guaranteed delivery, protocol for mapping transport of large block data I/Os to a small packet physical, switching back plane.
• Fully developed Xyratex/Mylex RAID controller configuration and management application and user interface.
• Developed ISP2310 and SCSI layer target mode driver for disk-less "back-to-back" testing.
  

Network Appliance Inc.,  Sunnyvale, CA

• Developed QLogic ISP2100 PCI-FCAL host adapter driver.
• "Clusterized" Fibrechannel driver stack.
• Developed a "FC loop debugging guide" for debugging common problems associated with FC loop topologies.
• Investigated feasibility of switched fibrechannel (SAN); some ANSI committee work to fill several holes in specs needed for deploying SAN in appliance applications.
• Developed QLogic ISP2200 and ISP2300 PCI-FC N-port adapter driver, fabric Name and Management services manager and topological discovery.
• Unofficial project lead on team doing complete rewrite of I/O storage software layers. Design goals were
• I/O multi-path for fail over, static load balancing, and FC-level trunking.
• interrupt driven state change notification throughout stack and outwards to clients of storage driver stack; no more polling for devices.
• modularization and layering methodology.
• data hiding and abstraction from clients of storage stack.
• true OPEN/CLOSE protocols with state driven implementation for code safety.
• full support for FC-SAN fabric attached disk and tape devices, allowing the deployment of loosely coupled clusters of machines sharing disk and tape devices.
• During Netapp's "summer of hell", analyzed and solved about half-a-dozen sources of data corruption. Included software bugs, adapter firmware bugs, disk driver firmware bugs and even the odd hardware timing problem. Worked closely with Netapp peers in other groups, disk drive and adapter vendors to develop problem-reproduction strategies and bug resolution.
• Developed code for HBA-layer modules for Netapp's ONTAP simulator, allowing simulation of complete storage stack.

Silicon Graphics Computer Systems, Mountain View, CA

• Developed QLogic 1040 PCI-SCSI host adapter driver and assisted in hardware bringup of controller card using the same.
• Developed "fail over" kernel module, a part of the dual-pathed disk, high-availability infrastructure.
• Developed/debugged/supported several pieces of SGI's high-end SCSI I/O driver infrastructure; high-level disk, tape and RAID drivers, low-level SCSI and Fibrechannel host adapter drivers.
• Using kernel profiling techniques, performance tuned (kernel and driver software) and did benchmarking of largest I/O system in SGI's history.

Silicon Graphics Computer Systems, Mountain View, CA

• Developed an I/O exerciser, integration and performance visualization toolkit for SCSI disk and tape devices.
• Developed a DES for FibreChannel disks and RAIDed FibreChannel disks, to characterize performance limitations.
• Developed IRIX device driver for PCI-to-FibreChannel controller (Genroco) and did hardware bringup of PCI-to-IBUS (SGI proprietary bus) bridge.
• Developed enterprise-wide FC-AL disk management and enclosure environmental-monitoring tools relying on FC-AL drive implemented SES protocol.
• De facto system/network administrator and web-master for peripherals engineering group.

Integrated Systems Inc., Santa Clara, CA

• Developed SCSI driver for WD33C93 on 68030 based MVME147 SBC.
• Ported pSOSystem to 68030 based GMS V17 SBC; included support for WD53C300 SCSI, LANCE ethernet, 68562 DUART.
• Developed SCSI bootloader and boot configuration utilities.
• Developed/ported BOOTP client and server for pSOSystem.
• Developed IP over FDDI driver for Crescendo C321-MPC EISA based FDDI controller.
• Developed serial console redirection driver for pSOSystem. (similar to pseudo-tty port)
• Support and bug fixes for RTOS kernel (pSOS+), IP network system (pNA+), RPC and Xlib components, Unix-like file system (pHILE+), embedded source level debugger (pROBE+)
• Supported 680x0, 80386 and i906 platforms.

University of Oregon, Eugene, OR

• Designed and taught a three-quarter "Intro to Pascal Programming" course.
• Assisted in teaching a three-quarter "Intro to Computer Science with Scheme" course.

Pyramid Technology Corp., Mnt. View, CA

• Developed in assembly language, major portions of the control firmware for an IPI-2 disk controller. The controller hardware architecture consisted of a time slice, triple-sequencer, bit-sliced design (based on AMD29116), with 64-bit control word which was the engine for a proprietary multi-processor, multi-tasking kernel under which the controller processes executed.
• Developed a debug platform and debugger utility software for IPI controller.
• Developed debug and diagnostic firmware for hardware bringup of prototype IPI controller hardware.
• Performed hardware bringup of prototype IPI controller hardware.

Data Technology Corp., Santa Clara, CA

• Developed firmware for SCSI-to-ST506 bridge controller; Zilog Super-8 CPU and SMS chipset (SCSI sequencer, disk R/W channel sequencer, DMA engines)
• Developed software for ICE and assembler for DTC proprietary RISC processor and R/W channel. (DTC296)
• Developed software for SCSI debugger and driver for Adaptec PC/AT based host adapter.

Spectra Logic Corp., Mnt. View., CA

• Sustained and provided customer support to the hardware and firmware for a series of high performance, emulating SMD disk and PERTEC tape controller.

• Device Driver development (Disk, Tape, SCSI, FC-AL, FC-SAN, Serial, Network)
• UNIX kernel level development and performance tuning.
• Embedded and low-level system software development.
• Expert in debugging data corruption problems
• UNIX systems programming; IRIX, SunOS; BSD IP Network programming; Xlib, Xt, OSF/Motif.
• Firmware and hardware design of microprocessor and micro-controller based control units.
• Languages : C, Scheme, C++, C-shell, Bourne-shell, HTML.
• Processors : 80x86, 680x0, i960, R4000
• Documentation Tools : FrameMaker, MS-Word

• M.Sc. in Computer Science - Univ. of Oregon, June 1992
• B.A. in Physics - Univ. of California, Santa Cruz, 1986 - Highest Honors
• B.A. in Computer Science - Univ. of California, Santa Cruz, 1986 - Highest Honors

• Pat. 7,210,068 : April 24, 2007, System and Method for Multipath I/O Support for Fibre Channel Devices, Tony Aiello, Radek Aster
• Pat. (pending) P01-1037/112056-0007 : December 21, 2001, System and Method implementing disk ownership in Networked Storage, Susan M. Coatney, Alan L. Rowe, Radek Aster, Joydeep Sen Sarma
• Pat. 7,159,080 : January 2, 2007, System and Method for storing Storage Operating System data in switch ports, Susan M. Coatney, Radek Aster
• Pat. 6,715,034 : March 30, 2004, Switching File System Requests in a Mass Storage System, Stephen Kleiman, Radek Aster, Anthony Aiello
• Pat. 5,812,754 : September 22, 1998, Raid system with fibre channel arbitrated loop, Albert S. Lui, Ronald John Naminski, James Wesley Oliver, Radek Aster, Neill Preston Wood

• Completed a cross-country (east to west coast) bicycle tour in 10 weeks, covering 4000 miles. (summer `91)
• Completed a cross-country Alaska to Oregon bicycle tour in 11 weeks, covering 3900 miles (summer `92)
• Completed a solo cyle tour of the east coast of South Africa (winter '98)