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Worker Node Requirements

Worker Node Requirements. TCO – biggest bang for the buck Efficiency per $ important (ie cost per unit of work) Processor speed (faster is not necessarily better) HT enabled (or not) Memory per job slot Local disk I/O per job slot Networking. Dell R410 is the workhorse

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Worker Node Requirements

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  1. Worker Node Requirements • TCO – biggest bang for the buck • Efficiency per $ important (ie cost per unit of work) • Processor speed (faster is not necessarily better) • HT enabled (or not) • Memory per job slot • Local disk I/O per job slot • Networking

  2. Dell R410 is the workhorse • X5660 cpu with HT (10-15% more work), 24 job slots • 48GB memory (but now should be 72G or more) • Multiple local drives (H200, three 1TB SATA 7200RPM) • 1Gb NICS • CC WN node would use IB for private interface • Good connection to local SE • Must have NAT access to public network (IB or 1Gb ?) • BNL tests show Dell CP6100 is bad for Atlas jobs

  3. SE Pool Nodes • dCache 1.9.12 with locality cache (like AGLT2) • Use GPFS for backing store • IB used to get to DDN • 10Ge to public network • Fast, non-firewalled access to UC and IU sites • WNs connect to SE via IB (dcap, direct access) • Dell R710 type node with 10Ge and IB • AGLT2 use 48GB • Small amount of local disk • How many pool nodes is not known and will grow

  4. Integration and Operation • Personnel on the CC who will help • Condor • Condor with Flocking from UC • Need local Condor master on public and IB networks • Non-firewall to UC • Could be on a VM or separate node (like an R410) • Squid • Local cache for CVMFS and Frontier • Public and IB • Can also serve UC and IU • Not a fast CPU, but needs memory and disk • Some CERN access for monitoring

  5. Networking Requirements • WAN improvements between UC, IU and UIUC in works • 10Ge public connection for SE pools • IB from pool nodes to DDN and WN to pool nodes • Condor master and Squid also need public (1Gb) • WNs can be private but need fast NAT access • Firewalling between UC, IU and UIUC need to be open

  6. Other Items of Interest • UC monitoring of UIUC nodes • Very fluid environment • Who has root • How can we make changes (work in progress) • One bad WN can spoil the whole lot

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