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Creating and Managing Arrays & Partitions
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
83
5.4.1 Enabling Dynamic Spares
The Dynamic Spares option lets you use all of your disk drives in
redundant arrays, without assigning one as a spare. For example, if you
enable Dynamic Spares and a drive fails, you can replace the drive and
the EF2800 will rescan the bus, find the new disk drive, and
automatically start reconstruction of the array. You do not have to
assign the new drive as a spare for the reconstruct to start.
With Dynamic Spares enabled, if you have spares or available drives,
the EF2800 first looks for a dedicated or global spare for the
reconstruction. If none is found, it uses an available drive, which the
EF2800 automatically assigns as a spare and starts reconstruction.
You must make sure that the new or available drive has enough
capacity to replace the smallest member in the array and does not
contain metadata (for information about clearing metadata, refer to
Section G.1.2, "Clearing Metadata from a Drive" on page 288).
N
OTE
:
Performance in systems without an enclosure management
processor (EMP) will decrease if an array becomes critical with this option
enabled and there are no available drives to start reconstruction. To
minimize the performance impact, consider adding a dedicated spare or
global spare instead of enabling Dynamic Spares.
To enable dynamic spares:
1. From SAM, select Manage EF2800 > General Config > Option
Configuration. The Option Configuration page displays.
2. For Dynamic Spare Config, select Enabled.
3. Click Change Options to save your changes.
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