DataDirect Networks EF2800, Руководство пользователя

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DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
M a n a g i n g S p a r e s
F.2 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 SM will rescan the bus, find the new disk drive, and automatically
start reconstruction of the array. The SM automatically finds the new
drive and reconstructs the array.
With Dynamic Spares enabled, if you have spares or available drives,
the SM first looks for a dedicated or spare pool drive for the
reconstruction. If none is found, it uses an available drive, which the SM
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 (see section
G.1.2
,
"Clearing Metadata from a Drive"
on page 288 ).
A change to this setting on either SM is automatically updated on the
other SM.
NOTE: 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, increase the EF2800 rescan rate as
described in the steps below.
To enable dynamic spares:
1.
From the System Menu, select
Configuration Menu
and press
<Enter>. The Configuration Menu displays.
2.
Select
Option Configuration
and press <Enter>.
The Option Configuration screen displays.
3.
Select
Dynamic Spare Configuration
and press <Enter>.
The Dynamic Spare Config screen displays. The current setting is
marked with an * next to it.