DataDirect EF2800 Guía de usuario Pagina 105

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DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
Creating and Managing Arrays & Partitions
5.4 Managing Spares
RAID controllers automatically reconstruct redundant (fault-tolerant)
arrays (RAID 1, RAID 3, RAID 4, RAID 5, RAID 10, and RAID 50) if an
array becomes critical and a properly sized spare drive is available. An
array becomes critical when one or more member drives fails.
If you enable the Dynamic Spares option and a drive fails, you can
replace the drive and the SM will rescan the bus, find the new disk
drive, and automatically start reconstruction of the array (see page 83).
You can set up two types of spare drives:
Dedicated: Available drive that is assigned to a specific array (see
page 84).
Global: Available drive that is assigned as a global spare, which can
provide a spare for any failed drive in any redundant array. Global
spares are available to any redundant array on the EF2800. If a
drive in an array fails, the SM can use a global spare to reconstruct
the critical array (see page 85).
When a drive fails, the EF2800 looks for a dedicated spare first. If it
does not find a properly sized dedicated spare, it looks for a global
spare.
If a reconstruct does not start automatically, it means that no valid
spares are available. To start a reconstruct, you must:
1. Replace the failed drive, if no other drive is available.
2. Enable Dynamic Spares or add the new drive or another available
drive as a dedicated spare to the array or as a global spare.
For more information, see Section 5.4.1, "Enabling Dynamic Spares" on
page 83 or Section 5.4.2.1, "Adding a Dedicated Spare" on page 84.
Remember that any global spares added might be used by any critical
array, not necessarily the array you want.
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