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Title: ZFS on RBODs - Leveraging RAID Controllers for Metrics and Enclosure Management

Traditionally, the Lustre file system has relied on the ldiskfs file system with reliable RAID (Redundant Array of Independent Disks) storage underneath. As of Lustre 2.4, ZFS was added as a backend file system, with built-in software RAID, thereby removing the need of expensive RAID controllers. ZFS was designed to work with JBOD (Just a Bunch Of Disks) storage enclosures under the Solaris Operating System, which provided a rich device management system. Long time users of the Lustre file system have relied on the RAID controllers to provide metrics and enclosure monitoring and management services, with rich APIs and command line interfaces. This paper will study a hybrid approach using an advanced full featured RAID enclosure which is presented to the host as a JBOD, This RBOD (RAIDed Bunch Of Disks) allows ZFS to do the RAID protection and error correction, while the RAID controller handles management of the disks and monitors the enclosure. It was hoped that the value of the RAID controller features would offset the additional cost, and that performance would not suffer in this mode. The test results revealed that the hybrid RBOD approach did suffer reduced performance.
Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
OSTI Identifier:
1184101
Report Number(s):
LLNL-TR--669183
TRN: US1500303
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Resource Relation:
Conference: International Workshop on the Lustre Ecosystem: Challenges and Opportunities, Annapolis, MD (United States), 3-4 Mar 2015
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
97 MATHEMATICS AND COMPUTING; MANAGEMENT; METRICS; MONITORING; PERFORMANCE; COMPUTER CODES; CORRECTIONS; COST; ERRORS; EQUIPMENT INTERFACES; MONITORING; MAGNETIC DISKS