Disk Inventory

    Content of this page

      This page contains 3 different tables.

    1.  The first table contains a list of disk-packs that have been bought by stations and are still active. Stations should keep that table updated and if they withdraw disk-packs from circulation they should be removed from the table
    2. The second table contains the disk space bought per year and per station to populate disk-packs.
    3. The third table contains the space disk bought per year and per station to populate Flexbuff units.

    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 2200 25 0 21 9 11 0 26 37 12 8 5 47   23 4 226 2017-05-08
    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 1086 0 0 0 4 14 0 17 0 13 29 0 17   16   110 2017-04-24
    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 384 0 0 0 0 0 0 10 2 0 15 0 4   5   36 2018-08-31
    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 ~6600
    EVN use ~2400

    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 uses ca. 600 TB for GMVA. RA contribution is for EVN: ?? TB.
    • 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 for disk-packs

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

    Year Ef Hh Jb KVAZAR Mc Mh Nt On Sh+T6 Sr Tr Ur Wb Ys Total (TB)
    2011 32  80 48 48   12               24 196
    2012 64  40 80 112 32   64 80         32   504
    2013 80  64 80   48 32  64 80   16 40 96 32   632
    2014 96    150   32 16 72 150   112     152 72 848
    2015   160 192   64   32 192         96

    96

    832
    2016     288   96           64   288*   736
    2017 160   96               40   120*   416
    2018     0                   240* 128* 368
    Total (TB) 272 344 550 160 272 60 232 502   128 144 96 960 310 4208

    Flexbuf purchases (disk space)

    In 2016 the TOG agreed that the 7000 € per year investment per station could be used either for Flexbuff space or disk packs. The CBD supported this policy
    Year Ef (S+J) Hh (S+J) KVAZAR Ir (S+J) Jb (S+J) Mc (S+J) Mh (S+J Nt (S+J) On (S+J) Sr (S+J) Wb (S+J) Ys (S+J) Total (1)
    2015 128                             324               452
    2016   144 144 288                         (144)         216 144 865
    2017 192             144 288 160  120     160 120           288     834
    2018         80 288 288 200       103         360 360 360     300 360  
    2019               240                                
    Total (TB) 464 346 80 576 768 244 196 244 684 720 202 768 5156

    Notes:

    • Units in TB. Original space at the units
    • Codes: S -> Flexbuff at the station. - > Flexbuff at JIVE correlator
    • (1) Flexbuff size at JIVE is reduced due to using a RAID. In the total and partial sums this is taken into account, but it is not taken into account in the individual numbers per station and year.
      • 144 TB -> 101 TB
      • 240 TB -> 168 TB
      • 288 TB -> 202 TB
      • 360 TB -> 252 TB 
    • Ef uses a Mark6 and modules which can be replaced. Thus more modules can be used if needed. Latest purchase in 2017 is 16 x 10 TB disks.
    • A standard 36 unit may use 4, 6 or 8 TB disks.
      • 4 TB x 36 = 144 TB;
      • 6 TB x 36 = 216 TB
      • 8 TB x 36 = 288 TB
    • Approximate costs:
      • 2015: 44 € /TB (from 4 TB NAS disks)
      • 2016:
      • 2017: 50 €/TB  (from 8 TB NAS disks)
      • 2018: (March) ~28€/TB (from 10TB Seagate Ironwolf, €281 inclusive VAT in the Netherlands)
    • Replacing disks at Flexbuffs:
      • Ys replaces 36 x 4 TB disks by 36 x 10 TB disks. 32 x 4 TB disks are used to populate 4 Mark5B packs. 4 x 4TB are recovered by Ys.
      • Wb bought 36 (12 in Nov. 2017 and 24 in Mar. 2018) 10TB disks so that JIVE could upgrade FlexBuffs with larger disks.

    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)

    In the latest batch we found that they write faster than read. This should be no problem for playback at a software correlator, but for firmware/hardware correlators with a fixed clock this might be different.

    10 TB

    10TB Seagate Ironwolf (ST10000VN0004 7200), work well in FlexBuffs (advice form JIVE,  - A. Polatidis, Nov 2017) (agreed, works well also at Jodrell - E. Varenius, may 2018)

    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.
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