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= Parallel File Systems: File Systems for HPC Clusters =
== 1. 作者將 Cluster FS 分為兩類： ==
   * '''DFS''' (Distributed File Systems)
     * ”parallel” as they utilize '''''multiple data servers'''''
   * '''PFS''' (Parallel File Systems)
     * use a '''''single server''''', are not necessarily parallel, they can give the user '''''”parallel access”''''' to a file system.

== 2. DFS == 
 * '''2.2.1''' DFS are network based (i.e. the actual storage hardware is not necessarily on the nodes) but it not necessarily parallel (i.e.there may not be multiple servers that are delivering the file system).
 * '''[wiki:rock/paper/PFS_HPC/NFS 2.2.2 作者先舉 NFS 來介紹：]'''
 * '''[wiki:rock/paper/PFS_HPC/Clustered_NAS 2.2.3 作者第二個舉的是 Clustered NAS：]'''

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== 3. PFS == 
 * Provide lots of I/O for clusters
 * provide a centralized file system for clusters
   * Centralized file systems can ease a '''''management burden''''' & '''''improve the scalability''''' of cluster storage
 * PFS are distinguished from DFS because the clients contact multiple storage devices instead of a single device or a gateway
 * 作者將 PFS 分為兩類：
   1. '''[wiki:rock/paper/PFS_HPC/PFS-type1 First Type]''' -> uses more '''''traditional methods''''' such as file locking as part of the file system (block based, or even file based, schemes)
   2. '''[wiki:rock/paper/PFS_HPC/PFS-type2 Second type: Object based file systems]'''

 

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== 想法 ==
 * 此篇論點屬 survey 性質，可用於撰寫 DFS Paper 的文獻探討 [http://en.wikipedia.org/wiki/List_of_file_systems#Distributed_file_systems DFS from wiki]