The Software Defined Online Storage System at the GridKa WLCG Tier-1 Center
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1 The Software Defined Online Storage System at the GridKa WLCG Tier-1 Center CHEP 2018, Sofia Jan Erik Sundermann, Jolanta Bubeliene, Ludmilla Obholz, Andreas Petzold STEINBUCH CENTRE FOR COMPUTING (SCC) KIT The Research University in the Helmholtz Association
2 GridKa Online Storage System New storage system in production since 2017 Storage system design allows for scalability both in size and performance Spectrum Scale (v4.2) software defined storage Few large file systems for better scalability and manageability Allows to adapt to various use cases (4 experiments, tape buffer, ) Total capacity: 34PB 2 July 2018
3 Technical Design NEC GxFS Storage Appliance with 22 redundant storage servers 90 disk enclosures 5400 HDDs for data (8+10TB) 58 SSDs (1.6 TB) in separate enclosures for file system metadata Two redundant IB fabrics (Mellanox 56G FDR) 64 protocol servers with 40GE 8x 100GE uplink to GridKa backbone 3 July 2018
4 Storage Building Blocks (SBB) Each SBB with 2 servers (NEC Express 5800 R120g-2M) Redundantly connected to 2x5 disk enclosures (NetApp E5600 / DE6600) 60 disks per enclosure (8TB / 10TB NL SAS) Setup in Dynamic Disk Pools (DDP) with 50 disks per DDP Data stored as raid6-stripes (8+2P) Disk space corresponding to 3 disks as reserved capacity for fast rebuild NEC Express 5800 R120g E5600 DE July 2018
5 File Servers: xrootd File servers separated form storage in remote protocol clusters Native xrootd setup for ALICE Each xrootd file server is able to serve all files Directly profits from parallel file system Easy to scale throughput by adding additional file servers Spectrum Scale Storage Cluster with file sytem Protocol Server Cluster xrootd 1 /export/alice/... xrootd 2 xrootd x 5 July 2018
6 File Servers: dcache File servers separated form storage in remote protocol clusters Separate dcache instances for ATLAS, CMS, LHCb, Belle II Each dcache pool lives in sub-directory of large file system No automatic fail over but easy to deploy pool on new hardware Work in progress to improve pool startup times Spectrum Scale Storage Cluster with file sytem /export/atlas/pool1 /export/atlas/pool2 Protocol Server Cluster dcache 1 dcache 2 /export/atlas/poolx dcache x 6 July 2018
7 Deployment and Configuration Centralized host management for different infrastructures All configuration in GitLab Rolled out via continuous integration system Puppet / Foreman host configuration & deployment Spectrum Scale integration New nodes join existing Spectrum Scale clusters automatically Reinstalled nodes recover Spectrum Scale config automatically Nodes join existing CES clusters automatically 7 July 2018
8 Monitoring and Performance Data Started to use ELK stack to collect log files from storage servers Helps to correlate errors events of cluster nodes Example: RDMA connection errors due to broken IB cable Collect performance and health data with Telegraf / InfluxDB / Grafana 8 July 2018
9 Performance User requested maximum read/write performance so far: 50GB/s Usage statistics (2017 average rates per month) 7.5 / 4.2 PB read from compute farm / remote 1.1 / 3.0 PB written from compute farm / remote GPFS r/w throughput read write GPFS read volume GPFS write volume 9 July 2018
10 Experience with Storage Expansion GridKa storage expansion for 2018/2019 has already been setup Capacity: 23 à 34 PB # protocol servers: 44 à 64, # NSD servers: 16 à 22 Expected combined r/w performance: 70GB/s à ~ 100GB/s Transparently included in existing IB fabrics and GPFS file systems During upgrade changed setup of IB fabrics from 1:1 à 1:2 blocking factor Spine 1:1 1:2 Leaf 10 July 2018
11 Summary and Outlook New online storage system successful in WLCG Tier-1 center Transparently expanded system with 2018/19 pledges Started investigating technological options for time beyond 2019 ~20% per year resource increase envisaged ~49PB disk storage till 2021 Ready for scaling system for requirements towards HL-LHC Disk capacity [TB] 11 July 2018
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