Contract SFS-DEV-001 early draft

SFS-DEV-001 includes three areas for development. These areas are listed below with highlighted results.

Project Documents
This contract defines development in three broad areas described in the [[Media:SFS-DEV-001_scope-of-work.pdf|Statement of Work]].
 * Project 1: Single Server Metadata Performance Improvements
 * Subproject 1.1: SMP Node Affinity
 * Subproject 1.2: Parallel Directory Operations
 * Project 2. Distributed Namespace: Remote Directories and Striped Directories
 * Subproject 2.1: Remote Directories
 * Subproject 2.2: Striped Directories
 * Project 3. Lustre File System Checker
 * Subproject 3.1: Inode Iterator & OI Scrub
 * Subproject 3.2: MDT-OST Consistency
 * Subproject 3.3: MDT-MDT Consistency
 * Subproject 3.4: Performance

Each subproject is developed using a 6 point milestone plan. Completed documents are available from the project status page.

Key Message

 * Enable file-level backup and restoration of an MDT.
 * Core infrastructure for online consistency checking.

Details of the internal of this work is available at on the Whamcloud community wiki.

Recent results
OI Scrub project provides ground work for a complete Lustre FSCK tool. Crucial to success of this tool is performance. OI Scrub has been demonstrated checking over 100K files/second on a typical MDS hardware node. In addition, OI Scrub provides a on-line mode that has been shown to add negligible system load with limited scan rates:



Key Message

 * Only a single lock is available for a directory on Lustre.
 * Clients wanting access to a file in the same directory must do so in serial.
 * This is fixed in

=== Recent Results

Whamcloud site for more information.