常见问题

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一般性问题

什么是Lustre?

Lustre是一种向外扩展结构的分布式并行文件系统。其元数据的服务和存储隔离在数据的服务和存储之外。

服务器(MDS/OSS)和目标(MDT/OST)有什么区别?

存储目标是存储对象(文件)或元数据的存储设备。而服务器则为客户端提供请求处理服务。客户端不直接访问存储。

为什么lists.lustre.org报错“The list overview page has been disabled temporarily”?

位于lists.lustre.org的邮件列表是DreamHost的提供商解决方案。不幸的是,他们对所有客户禁用了邮件列表概述页面,并且无意在近期修正这一举措。“temporarily”看上去意味着“permanently”。除了这个遗憾,DreamHost的邮件列表服务在速度、可维护性和成本方面都令人很满意。我们只需要忍受这个小小的不便。此外,你可以从这里Mailing Lists and IRC获得所有的邮件列表。

缩写

这些缩写都是什么意思?

  • DNE - Distributed Namespace Environment - feature aggregating multiple MDTs (possibly on multiple MDSes) into a single filesystem namespace
  • IDIF - OST object ID In FID - specific FID range reserved for compatibility with pre-DNE OST objects
  • IGIF - Inode and Generation In FID - specific FID range reserved for compatibility from Lustre 1.x MDT inode objects
  • FID - File IDentifier - unique 128-bit identifier for every object within a single filesystem, made up of a 64-bit sequence, a 32-bit object ID, and a 32-bit version field
  • IOV - I/O Vector
  • LMV - Logical Metadata Volume - client software layer that handles client (llite) access to multiple MDTs
  • LNET - Lustre Network - Type agnostic networking layer (TCP/IP on Ethernet, InfiniBand, Omni-Path, Cray Gemini, etc.)
  • LOD - Logical Object Device - MDS software layer that handles access to multiple MDTs and multiple OSTs
  • LOV - Logical Object Volume - client software layer that handles client (llite) access to multiple OSTs
  • MDC - MetaData Client - client software layer that interfaces to the MDS
  • MDD - Metadata Device Driver - MDS software layer that understands POSIX semantics for file access
  • MDS - MetaData Server - software service that manages access to filesystem namespace (inodes, paths, permission) requests from the client.
  • MDT - MetaData Target - storage device that holds the filesystem metadata (attributes, inodes, directories, xattrs, etc)
  • MGS - ManaGement Server - service that helps clients and servers with configuration
  • MGT - ManaGement Target - storage device that holds the configuration logs
  • NID - Network Identifier - used to uniquely identify a Lustre network endpoint by node ID and network type.
  • OFD - Object Filter Device - OSS software layer that handles file IO
  • OSC - Object Storage Client - client software layer that interfaces to the OST
  • OSD - Object Storage Device - server software layer that abstracts MDD and OFD access to underlying disk filesystems like ldiskfs and ZFS
  • OSP - Object Storage Proxy - server software layer that interfaces from one MDS to the OSD on another MDS or another OSS
  • OSS - Object Storage Server - software service that manages access to filesystem data (read, write, truncate, etc)
  • OST - Object Storage Target - storage device that holds the filesystem data (regular data files, not directories, xattrs, or other metadata)
  • PTLRPC - Portal RPC - A remote procedure call protocol layered over LNET

发行版

下一个主发行版是什么时候?

我们计划每6个月发行一个主发行版。路线图给出了当前的预期时间。

下一个维护发行版是什么时候?

每年会有数个维护发行版发布。每个发行版的发行时间由多种因素决定(Linux发行版,OpenZFS发行版,重要的bug修复补丁)。Lustre工作组是关于最新状态的最佳消息来源。