LaCie 131018 - StorView Snapshot - Mac, User Manual

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StorView RAID Module
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10.2.7 Trust an Array
When you create an array, you have the option to trust the array. This option should only be used in
environments where the user fully understands the consequences of the function. The trust array option
is provided to allow immediate access to an array for testing application purposes only.
A trusted array does not calculate parity across all drives and therefore there is no known state on the
drives. As data is received from the host parity is calculated as normal, but it occurs on a block basis.
There is no way to guarantee that parity has been calculated across the entire drive. The parity data will
be inconsistent and so a drive failure within a trusted array will cause data loss.
1 On the Main screen in the Tool Bar, click the Create Array icon.
2 The Create Array window will appear, select your drives in the Available Drives section.
3 Enter a name for your array. You may use up to 32 characters (ASCII).
4 Select the RAID level for the array.
5 Enter the desired chunk size. Click the pull-down menu and choose from the available values.
6 At Item 6, use the pull-down menu and select “Trust.”
7 Choose the “Back-off Percent” (reserved capacity) for the drives. The default is 1%.
8 Set the Read-Ahead Cache threshold.
9 Set the Writeback Cache options.
10 Click the CREATE button to create and trust the array.
Figure 10–12 Create Array Screen (RS-4835-F4-5404E Shown)