Supermicro AOC-USAS2-L8e, Руководство пользователя

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Chapter 4: Integrated Mirroring and Integrated Mirroring Enhanced
Resynchronization with Concurrent Host I/O Operation
The Integrated RAID firmware allows host I/Os to continue on a mirrored volume while
the volume is being resynchronized in the background. The firmware automatically
starts resynchronizing data after a disk failure activates a hot spare, or after a physical
disk in a mirrored volume has been hot swapped.
Hot Swapping
The Integrated RAID firmware supports hot swapping, and it automatically
resynchronizes the hot-swapped disk in the background without any host or user
intervention. The firmware detects hot-swap removal and disk insertion.
Following a hot-swap event, the firmware verifies that the new physical disk has enough
capacity for the mirrored volume. The firmware resynchronizes all replaced
hot-swapped disks, even if the same disk is re-inserted. In a mirrored volume with an
even numbers of disks, the firmware marks the hot-swapped disk as a secondary disk
and the other disk with data as the primary disk. The firmware resynchronizes all data
from the primary disk onto the new secondary disk. In a mirrored volume with an odd
number of disks, primary and secondary sets include three disks instead of two.
Hot Spare Disk
You can configure two disks as global hot spare disks to protect data on the mirrored
volumes configured on the SAS2 controller. If the Integrated RAID firmware fails one of
the mirrored disks, it automatically replaces the failed disk with a hot spare disk and then
resynchronizes the mirrored data. The firmware automatically receives a notification
when a hot spare replaces the failed disk, and it then designates that disk as the new
hot spare.
Online Capacity Expansion
The OCE feature enables you to expand the capacity of an existing two-disk Integrated
Mirroring (RAID1) volume by replacing the original disk drives with larger drives that
have the same protocol (SAS or SATA).
After you replace the disk drives and run the Online Capacity Expansion command, you
must use a commercial tool specific to the operating system to move or increase the
size of the partition on the volume.
NOTE: The new drives must be at least 50 GB larger than the original drives of
the volume.