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)

EVN / VLBA disk-pack flux

NRAO

JIVE

EVN stationssession+2

sessionBonn

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

Growth in Disk-pack Receipts

Growth in mean pack size (Receipts)

3/09 2/09 1/09 3/08 2/08 1/08 3/07 2/07 1/07

Sh 3 8 0 5 8 4 - 0 2Ur 3 12 3 6 8 11 - 3 12Mh 0 0 2 1 5 2 - - 0Hh - - - 10 4 3 0 2 3Ys 11 0 0 5 3 - - - -Tr 15 29 11 17 13 21 5 6 5On 23 28 8 14 21 16 7 23 5Mc 23 11 14 20 20 23 10 22 11Nt 11 27 17 20 22 25 7 7 13

Jb/Cm 34 24 28 7 35 40 3 18 18Wb 12 20 10 20 14 20 9 15 12Ef 12 20 11 13 21 0 6 21 21tot 147 179 104 138 173 165 47 117 102

Disk-pack Shipments from JIVE (Sta/Sess)

3/09 2/09 1/09 3/08 2/08 1/08

Sh 196 (3)

Ur 238 (3) 490 (12)

Mh 69 (2) 59 (1) 147 (5)

Hh 355 (4) 300 (3)

Ys 330 (11)

Tr 712 (15) 977 (29) 450 (11) 693 (17) 592 (13) 1089 (21)

On 584 (23) 458 (28) 172 (8)

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)

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