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12. Parallel Filesystems > 12.2. Using PVFS

Using PVFS

To make effective use of PVFS, you need to understand how PVFS distributes files across the cluster. PVFS uses a simple striping scheme with three striping parameters.

base

The cluster node where the file starts, given as an index where the first I/O server is 0. Typically, this defaults to 0.

pcount

The number of I/O servers among which the file is partitioned. Typically, this defaults to the total number of I/O servers.

ssize

The size of each strip, i.e., contiguous blocks of data. Typically, this defaults to 64 KB.

Figure 12-2 should help clarify how files are distributed. In the figure, the file is broken into eight pieces and distributed among four I/O servers. base is the index of the first I/O server.


  

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