Last modified 3 years ago Last modified on 08/16/16 15:05:23

dCache Tier I meeting August 16, 2016

[part of a series of meetings]

Present, IN2P3(), Sara(), Triumf(), BNL(), NDGF(Ulf), PIC(), KIT(Xavier), Fermi(), CERN()


(see box on the other side)

Site reports


Currently everything is going fine.

Upgrades to 2.16

Ulf described how they are (slowly) moving pools to 2.16. Most are currently on 2.15, but some non-production (old, unsupported hardware) are running 2.16.1. The heavily loaded in-production pools are still running 2.15.

Second billing service

NDGF installed a second instance of the billing service. They use this to spit out JSON directly into elastic search. This is NDGF-specific JSON format (e.g., splitting out pool hostname as a separate entity). The main goal is to avoid any preprocessing and avoid parsing the billing files.

Seems to be working OK so far, but it is filling up their elastic search instance quite quickly.

The billing plugin was written by Netta? and Dima? with Gerd's help.

Network Traffic

NDGF is seeing some 3--4 GiB/s sustained traffic. There are some peaks of ~10 GiB/s when contacting CMS Tier-2 (also running dCache) as these transfers use separate (and higher capacity) network links. With the network as the limiting factor, it will likely not be easy or fast to improve transfers.

Ulf also noted that they are currently seeing no tape writes.


There have been no issues to report over the past week.

HSM plugin

Xavier has continued his development on HSM plugin.

He noted that the pool lacks a help hsm-provider command, providing HSM-plugin specific configuration. He'd like it if this were documented (with default values), along with the possibility to retrospect the HSM settings to discover currently (possibly default) values.

Packages and is functional, but not stress-tested

Stage requests

Request the getUri method in Stage requests, to provide the URI corresponding to this request.

Support tickets for discussion

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Same time, next week.