Rorke Data The Galaxy 65 Specifikace stáhnout pdf (Strana 39)

Galaxy Web GUI User Reference Manual

3-4 Creating Logical Drives

4. Write Policy: Select a policy if you want a

specific caching mode to stick around with the

logical drive. Selecting default will allow firmware

to dynamically determine the caching mode of all

logical drives.

IMPORTANT!

 The “Write-back” and “Write-

through” parameters are

permanent for

specific logical drives. The “Default”

selection, however, is more complicated and more likely

equal to “not specified.”

 If set to “Default,” a logical drive’s write policy is controlled

not only by the system-level caching mode setting, but also

by the “Event trigger” mechanisms. The “Event Trigger”

mechanisms automatically disable the write-back caching

and adopt a conservative “Write-

through” mode in the

event of battery or component failures.

5. Assignment: If your subsystem is managed by

more than one RAID controller (dual-redundant

RAID controllers), you can manually divide the

work load between these two controllers by

assigning logical drives to different controllers.

6. Initialization: Two initialization modes are

available: Online and Offline. The online mode

allows you to immediately distribute I/Os to the

logical drive and avail the logical drive for the

following configuration processes, e.g., RAID

partitioning.

7. Power Saving: This feature supplements the

disk spin-down function, and supports power-

saving on specific logical drives or non-member

disk disks with an idle state and the 2-stage

power-down settings.

Advantages: see the power saving features

below.

Applicable Disk Drives:

Logical drives and non-member disks [including

spare drives and un-used drives (new or

formatted drives)]. The power-saving policy set

to an individual logical drive (from the View and

Edit Logical Drive menu) has priority over the

general Drive-side Parameter setting.

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