MERCATOR OCEAN JOURNA: 
SEPTEMBER 2021 
The Delivery Buffer Service (DBS), the most “delicate” PU- 
DU interface, was revisited multiple times, mainly during 
the first 2 years, according to MOi and PU feedback for 
enhancing its functionalities (e.g., allowing PUs to move 
and delete files and folders, iImproving error detection, and 
m2m approach, etc), its robustness and performance. 
Effort was also directed to add and improve a disaster 
recovery (DR; backup) system, deployed in two steps: 
- introduction of the DR System in async mode (nightly 
sync); active from end of 2018 to end 2020, 
DR improvements (sync mode): data is backed up as 
s00N as ingested by the DU; active since early 2021. 
As result, the total number of systems increased from the 
initial 58 to the actual 93 VMs, for a total (MY+NRT) of 636 
Cores and 2.1 Pb RAM (roughly +75% resources) 
2.2 Software 
Apart from the standard/classic FTP interface, Copernicus 
Marine Service provides advanced Interfaces for accessing 
Jata via standard OGC protocols. These interfaces are 
provided by specific software, namely THREDDS (e.g., 
WMS) and MOTU (aka Subsetter; it provides access to the 
DGF interface too). These software are actually Commercia! 
off-the-shelf (COTS) and the DU team has no (THREDDS) or 
very limited (MOTU) control over them. Copernicus Marine 
Service DU has however constantly upgraded these 
software for bug fixing, or for introducing new features/ 
anhancements, particularly on MOTU component (five 
-eleases implemented since the beginning). Currently. 
running versions are: THREDDSv4.6.14 and MOTUv3.12 
New software/Interfaces have been studied and proposed. 
The only one accepted, due to priority constraints, was 
ERDDAP Data Server (for INSITU data only) in substitution 
of Oceanotron due to its end of life/maintenance. 
Moreover, the DU team continuously adapted and improved 
software configuration according to users, PCs and Mercator 
Icean international (MOi) feedback/needs, leading to, e.g., the 
enabling of CORS, and SSL over HTTP, iImprovement of WMS 
experience, introduction of new data type (e.g., shapefiles) 
Under software category fall also the monitoring systems. 
The DU team spent lot of time introducing and improving 
monitoring systems for internal purposes (e.g., Systems 
availability, Interface accessibility, etc), and for Service 
improvements. Concerning the latter, two of these systems 
are particularly important within the Service (Copernicus 
Marine Service internal tools). 
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