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Disk Inventory

Modified 11:16, 24 Apr 2017 by alef | Page History

    Version as of 18:12, 15 May 2024

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    CBD decisions

    • In the beginning of disk operation the EVN directors agreed that each of the “busy” EVN station should provide at least 150 TB to the EVN disk pool. The other stations should contribute about 2 times the amount of disk space which is recorded at their telescope per session.
    • In 2011 the EVN directors agreed that each station should buy 7000€ worth of disk modules per year.
    • Additional disks should be bought at the end of 2014 to enable more observing. (See CBD meeeting minutes)

    Inventory

    Please update the table below


    Station Total TB 1 TB 1.3 TB 1.4 TB 1.6 TB 2 TB 2.4 TB 3.2 TB 4 TB 6 TB 8 TB 12 TB 16 TB 24 TB 32 TB 48 TB PACKS Last Updated
    Effelsberg 2038 25 0 21 9 11 0 26 37 12 8 5 47   23 4 226 2015-05-08
    Westerbork 390 0 2 20 0 36 0 0 12 0 43 0 3   5   82 2017-02-14
    Onsala 412 0 21 0 0 30 0 0 21 0   0 5   5   82 2014-10-31
    Medicina 504 2 0 0 0 22 5 13 11 0 3 0 11   5   72 2016-09-14
    Noto 446 10 0 0 0 14 0 20 0 0 6 0 8 3 3   63 2015-11-12
    Jodrell 990 0 0 0 4 14 0 17 0 13 29 0 17   10   104 2014-03-24
    Seshan 110 0 2 0 2 10 0 0 13 0 4 0 0       31 2012-12-10
    Urumqi 0 0 0 0 0 0 0 0 0 0 0 0 0       0 2015-01-23
    Hartrao 408 0 19 0 0 0 0 10 2 0 15 0 4   5   50 2017-04-24
    Torun 257 0 0 0 2 27 0 0 8 0 132 0 0   2   52 2016-09-14
    Yebes 325 0 0 0 3 2 0 0 15 0 12 0 4   3   38 2015-08-20
    Arecibo 20 0 0 0 0 10 0 0 0 0 0 0 0       10 ?
    Metsähovi 78 0 0 0 0 2 4 2 3 1 3 0 2       16 2014-10-13
    Sardinia 128 16       56                     9 2015-10-29
    KVAZAR 160 0 0 0 0 0 0 0 0 0 20 0 0       20 2015-11-09
    JIVE 206 5 0 10 0 53 0 0 0 0 10 0 0       78 2012-08-21
    Total ~6080
    EVN use ~1986

    2) 5 modules are 4-packs with 2-TB disks.

    3) 4 modules are 4-packs with 2-TB disks.  The  4TB disks bought in Dec 2014 & Dec 2015 are used to convert to a mixture of 16 TB packs and 32 TB packs (8=3x16 and 5x32TB in Jan 2017). JIVE correlator staff do the conversion when diskpacks are released. Total TBs reported are currently available (some 4TBTB disks have yet to be places and 3  remain as spare).  

    Note:

    • Effelsberg: Will remove all our small modules with less than 2 TB. (April 2010)
    • Effelsberg: Will try to avoid sending modules smaller than 3.2 TB. (January 2011)
    • 2 TB disks can only be handled with SDK8.2 and SDK8.3 with patch applied.
    • Modules bigger than 8 TB require SDK 9 which is now officially supported by the field operation.
    • Effelsberg upgraded 4x 8TB modules to 48 TB. (March 2017)

    Disk purchases

    The directors agreed in 2011 that each station should buy disk-modules for 7000 € per year.

    Year Effelsberg Medicina Westerbork Jodrell Yebes Torun Onsala Noto KVAZAR Shanghai Urumqi Hart Metsähovi Sardinia  
    2011 32 TB     48 TB 24 TB       48 TB     80 TB 12 TB    
    2012 64 TB 32 TB  32 TB 80 TB     80 TB 64 TB 112 TB     40TB      
    2013 80 TB 48TB 32 TB 120 TB   40 TB 80 TB 64 TB     96 TB 64TB 32 TB 16TB  
    2014 96 TB 32TB 152 TB 16TB 72 TB   150TB 72 TB         16 TB 112TB  
    2015   64TB 96 TB   96 TB   192TB 32 TB       160TB    

     
    2016   96TB       64TB                  
    2017                              

     

     

    Flexbuf purchases

     
    Year Effelsberg Hartebeesthoek Jodrell KVAZAR Medicina Metsahovi Noto Onsala Torun Sardinia Shanghai Urumqi Westerbork Yebes
    2015 128 TB             324 TB            
    2016 144 TB 144 + 144 TB           144 TB           216+144 TB
    2017         160+240TB   160TB           288TB  

     

    Disks which seem to work well

    2 TB

    • Hitachi Ultrastar A7K3000 HUA723020ALA640 2 TB Internal Hard Drive - Walter A.
    • We bought 60 Western Digital 2TB WD20EFRX-68EUZN0 for 83Euros+VAT each one. Disks are cheap and perform well. Only one nasty issue: the internal idle3 timer must be disabled on each one, to avoid delay at record start. Giuseppe (Medicina, Italy)
    • We bought 32 disks: Weestern Digital 2TB ED20EFRX for 80 euros + VAT each. Following Giuseppe's advice we ran idle3ctl on all of them to disable the timer (Yebes).

    3 TB

    I heard rumors from Haystack that disks from Hitachi and Seagate seem to work well. Durability is still untested. Hopefully we can have more details by end of January 2014 (TOG meeting). - Walter A.

    Today 14.1.2014 we ordered HGST HUA723030ALA640 3 TB (Hitachi SATA 600, Ultrastar A7K3000) for 2 modules for test purposes. We have them working in RAIDS here without problems. Cost 165€ + VAT - Walter A.

    4 TB

    We bought HGST 4 TB Hitachi Ultrastar 7K4000 SATA III (HUS724040ALA640 0F14688) disks. The 3 modules we made conditioned well. Cost 211 € + VAT. - Walter A. 28.4.14

    In Nov 2014, ASTRON also bought  (30 pieces) Hitachi Ultrastar 7K4000 SATA III disks  for €200 (+21% VAT). Antonis Polatidis 9.12.14

    In Mar 2105, Hart bought (40 pieces) Seagate 4TB NAS series ST4000VN000 disks for ~167 euro (+14% VAT)  Jonathan Quick 1.4.15 - performance TBD

    In April 2015, Ys bought 8 disks WD40EFRX NAS Series for 177 €. P de Vicente (28-4-2015). 16 additional 32 Tb disk were bought in August 2015.

    Medicina bought 16  WD40EFRX red NAS disks in March 2015 at 123E. After the idle3 timer removal they perform well, so far.
     Other 41 disks of same type were bought last december (2015) at 138.95E.

    6 TB

    We bought HGST 6 TB Hitachi He filled disks (need them for high altitude). They will be used in modules for the Mark 6. Price about 360 € + VAT (bought 128). The disks performed well at 5000 m altitude in Mark 6.    - Walter A. 1.10.2014 & 19.2.2015

    8 TB

    We bought HGST 8 TB HGST He filled disks.They work well in Mark 6 modules. W.A. (April 2017)

     

    ASTRO / GEO VSN assignments at EVN stations

    The information below may be out of date. Please update!!

    • HART-001 thru HART-020 are geo modules
    • HART-021 thru HART-052 are astro modules
    • HART+100 up to +499 will be geo modules
    • HART+500 and above will be astro modules
    • Medicina, label number above 1000 are geo modules, below are astro module (ie med-1001 stands for geo modules).
    • Noto: "NOT" are geo modules (i.e. NOT-0001) - "NTO" are astro modules (i.e. NTO-0001)
    • Onsala: Astro disks have a VSN number below 100, so it will look something like this: OSOD-001
    • Onsala Geo disks have a VSN number above 100, so it will look something like this: OSOD-101
       
    • Yebes astrodisks have a VSN number below 100: OAN-00xx (PATA) and OAN+00xx (SATA, up to OAN+0025)
    • Yebes geodesy disks have a VSN number above 100: OAN-01xx
    • SHAO: Geo/Astro split unknown
    • XAO (Ur): XAO#1xxx for Astro, XAO#0xxx for Geo and XAO#Txxx for local Testing (IDE: #=- , SATA: #=+)
    • KVAZAR: Geo/Astro disks used for EVN have a VSN format: IAAE-xxx.