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Online Systems Status

Online Systems Status. Review of requirements System configuration Current acquisitions Next steps. Upgrade Meeting 4-Sep-1997 Stu Fuess. Review of Requirements. Data flow 53 Hz @ 250 Kbytes / event = 13 Mbytes/sec

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Online Systems Status

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  1. Online Systems Status Review of requirements System configuration Current acquisitions Next steps... Upgrade Meeting 4-Sep-1997 Stu Fuess

  2. Review of Requirements • Data flow • 53 Hz @ 250 Kbytes / event = 13 Mbytes/sec • Data spooled to local disk, then transferred to FCC for storage implies > 25 Mbytes/sec local storage access • Local buffering of at least 1 hour, plus reasonable unloading of buffer implies • ~ 100 Gbytes local storage • ~ 35 Mbytes/sec local storage access

  3. Requirements cont’d. • Additional data production • Calibration data • Run monitoring databases additional ~ 2 Mbytes/sec • Data monitoring • Desire ~10Hz to monitor(s) ~ 5 Mbytes/sec distribution • Processing power for monitors Look for cheap PC solution • Detector control & monitoring • Bandwidths not yet well understood, expected~ Mbyte/sec • Supplied by workstations or PCs

  4. M P M Level 3 Interface Schematic Configuration Data Cable Host Buffer Disk 100 GB Monitor Nodes 13 Mbyte/s 5 Mbyte/s Network Interconnect 15 Mbyte/s Control Room Nodes Front End Nodes FCC

  5. System Configuration • Design goal of >99% uptime • Redundant systems, each capable of (nearly?) full bandwidth • Multiple paths to critical disks • DØ and Fermi product disks • NOT data buffer disks • Existing technologies: • UNIX ‘cluster’ for redundant disk access (though probably do not need failover capabilities) • Networks: • FDDI <10 MByte/s • 100 Mbit Ethernet ~5 MByte/s • I/O: • Fast Wide SCSI ~20 MByte/s • Ultra Wide SCSI ~40 MByte/s

  6. System Configuration cont’d. • Problems: • Not easy to get required bandwidths now • network in from L3, out to FCC • I/O to data buffer disks • Relying on future technologies: • Gigabit Ethernet • Fibre Channel - Arbitrated Loop (FC-AL) • FCC tape archive / HSM / robotics • Fallback position: • Require multiple servers / network / I/O paths • Multiple I/O controllers per server • Conventional tape mounting

  7. M P M Level 3 Interface M P M Level 3 Interface M P M Level 3 Interface Online Configuration RAID Disk Data Cable StorageWorks RAID Array FC FC FC Shared SCSI Memory Channel Host A AlphaServer Host B AlphaServer Monitor AlphaServer FC-AL FC-AL FC-AL Buffer Disk Buffer Disk Buffer Disk FC FC FC Monitor Node AlphaStation 100 Mb 100 Mb 100 Mb Monitor Node AlphaStation FC Monitor Node NT PC 100 Mb Switch Monitor Node Linux PC Router Router 10 Mb Switch FCC Control Room Nodes: NT PC Front End Nodes

  8. Purchases • FY97 purchases: • Server hardware: • DEC AlphaServer 4000, 5/466, 512MB • 16 PCI slots • 3-port UWSE SCSI RAID controller (local buffer disk) • FWSE SCSI controller (local system disk) • FWD SCSI controller (shared SCSI) • FDDI, 100 Mb Ethernet • StorageWorks hardware: • Rack • Controller crate, 3 disk crates • 6-channel RAID controller • Server software: • Digital UNIX (unlimited license) • DEC C,C++, FORTRAN compilers • Other: • 144 GB local disk • 3 WinNT PCs (1 to also have Linux) • Network switches / hubs

  9. M P M Level 3 Interface 1/1/98 Configuration RAID Disk Data Cable StorageWorks RAID Array SCSI AlphaServer 4000 SCSI Buffer Disk Monitor Node Alpha 3000/300 100 Mb 100 Mb 100 Mb Switch FDDI Monitor Node NT/ Linux PC FDDI Concentrator 100/10 Mb Hub Control Room Nodes: NT PC Front End Nodes

  10. Purchases... • Early FY98 purchases: • KAI C++ compiler • convert old Alphas from VMS to UNIX • ORACLE? • Fibre Channel controller, disk chassis, and disks • Future upgrade paths • Additional servers • Memory Channel interconnect, TruCluster software • AlphaServer 4000 can have 2 CPU, 4 GB memory • Add 2nd RAID controller to shared disk • Replace SCSI with FC-AL for buffer storage • FC RAID controllers • StorageWorks crate backplanes can be modified • Disks (dual port FC) • FC network

  11. Over the horizon... • DEC future products: • AlphaServer CPU up to 600 MHz by May ‘98 • Fibre Channel SCSI hardware late ‘97, UNIX drivers Spring ‘98(but 3rd party GENROCO controller available now) • No FC networking plans, relying on FDDI with GigaSwitch (but available with GENROCO board/driver) • 10,000 RPM drives support soon; unclear when 23 GB drives supported • In general… • FC-AL will be the SCSI solution • Storage will appear as network object

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