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EVN Disk-Shipping Logistics (JIVE  Stations)

EVN Disk-Shipping Logistics (JIVE  Stations). Quick review of Disk-pack flows Disk receipt evolution Shipment of Packs per station/session Shipment costs (reported by stations) Tactics Options.

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EVN Disk-Shipping Logistics (JIVE  Stations)

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  1. EVN Disk-Shipping Logistics(JIVE  Stations) • Quick review of Disk-pack flows • Disk receipt evolution • Shipment of Packs per station/session • Shipment costs (reported by stations) • Tactics Options EVN TOG Dec.2009, Effelsberg. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (12/iv/09)

  2. EVN / VLBA disk-pack flux EVN stations session+2 session for correlation JIVE pre-position Bonn NRAO

  3. Pre-session Timeliness • Needs: • Block schedule (& an end to revisions….) • Station on-hand & planned • Load calculation algorithms • Per target corrleator • Recording duty-cycle = 1 • Pack size -:= 0.09 TB • Schemes to accelerate (session+2) rule • Avoidance of distributing bad packs

  4. Growth in Disk-pack Receipts

  5. Growth in mean pack size (Receipts)

  6. Disk-pack Shipments from JIVE (Sta/Sess)

  7. Shipment Costs per Sta/Sess (in euro) Avg: On,Ys,Mh ~ 25-35 per pack Tr ~35-50 per pack (Tr costs include VAT) Sh,Ur,Hh ~ 40-100 per pack (Sh,Hh not including customs)

  8. Tactics Options • Stations pay both ways (CURRENT) • adv: no cost to JIVE (built into base budget) • disadv: more expensive (netto); stations must find cooperative shipper; different rules from geodesy; no centralized ledger of costs • JIVE pays outgoing, bills stations • adv: cheaper; fewer possibilities for delay; more immediate feedback about costs • disadv: ASTRON FZ does not want to support this; JIVE sees negative cash-flow • Sender pays each way (akin to geodesy) • adv: same as above; no billing stations required • disadv: how does JIVE come out even; not all EVN stations are JIVE partners

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