Sun Java System Application Server Enterprise Edition 8.1 2005Q2 High Availability Administration Guide

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### Specifying Device Size

Specify the device size using the `--devicesize` option. The recommended device size is:

    (4x / nd + 4l/d) / 0.99

Where

- x is the total size of user data

- n is the number of nodes (given by the `--hosts` option)

- d is the number of devices per node (given by the `--datadevices` option)

- l is the log buffer size (given by the attribute `LogBufferSize`)

  If refragmentation might occur (for example, using `hadbm addnodes`), then the recommended device size is:

      (8x / nd + 4l/d) / 0.99

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