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Category:DPM-End-of-legacy-mode-suport
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What's happening?
DPM (Disk Pool Manager) is the most widely deployed solution for storage of large data repositories on Grid sites for a wide range of applications. Last year it annouced that it w ould be deprecating its so-called "legacy" mode which includes its support for SRM (Storage Resource Broker) and the old rfio protocol. It also includes the lcg-utils clients.
Why?
The new DPM core, known as DOME (Disk Operations Management Engine) brings significant enhancements and is based on the secure, industry-standard channel HTTPS with web services. Discontinuing the legacy mode allows the developers to concentrate on the new future-proof DOME without the overhead of maintaining the legacy functionality.
What do I need to do?
End users
Traditionally, users interacted with DPM using a separate client, for example, SRM. With DOME, users interact with DPM via a frontend, e.g. gridFTP or xrootd, that make use of DOME in the background. For a comprehensive guide to DOME and its command set, please refer to: [1]
DPM administrators and site admins
To see whether end users are making use of legacy tools, Please check the contents of your srmv2.2 logfile. If this file is only showing routine reports (e.g. daemon stop/start, ping etc.) then that indicates that SRM is not being actively used by users.
Information about installing DPM and enabling DOME may be found here: [2]
To determine whether lcg-utils clients are being used, please look for occurrences of “PASV” in the gridftp logfile. (Newer clients such as gfal2 use “STOR” instead, meaning a delayed passive ftp.)
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