Intel SRCU31, User Manual

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116 Intel RAID SRCU31 Users Guide
Add Hot Fix Drive
This submenu option allows you to add a hot fix drive to an existing RAID 1, RAID 4, RAID 5, or
RAID 10 array drive. There are two different types of hot fix drives: Private and Pool hot fix
drives. A pool hot fix drive is a spare drive within the so-called hot fix pool. A drive in a hot fix
pool is available for several array drives as a hot fix drive. Thus, several array drives can share one
hot fix drive. Of course, once this drive has been used by one of the array drives, it is no longer
available for the others. A private hot fix drive is dedicated to one RAID 1, RAID 4, RAID 5, or
RAID 10 array drive.
Only drives that meet the following requirements are suitable as hot fix drives:
•
It must not be an active component of another array drive.
•
It must have a storage capacity greater than or equal to the storage capacity of the smallest
logical drive of the array drive. Example: A type RAID 5 array drive consists of the following
components:

Logical Drive 0 2000MB

Logical Drive 1 1500MB

Logical Drive 2 1100MB

Logical Drive 3 2000MB
This array drive has a usable storage capacity of 3300MB. A hot fix drive for this array must have
at least 1100MB of storage capacity.
✏
NOTE
To avoid wasting valuable storage capacity, it is recommended that all logical drives forming an
array drive have the same storage capacity.
In the Event of a Drive Failure
The controller will substitute a failed logical drive with a hot fix drive only if the array drive was in
the ready state before the failure. In other words, a hot fix drive can only be activated if the
corresponding array drive had a state of data redundancy at the moment of failure.
1. The controller’s alarm activates.
✏
NOTE
The alarm is activated only when the array drive is being accessed.
2. The controller activates the fail operation mode. In this mode, the array drive remains fully
operational. The data located on the failed drive is generated by means of the redundancy
information stored on the other drives, without causing any decrease in performance.
3. The controller integrates the hot fix drive into the array drive and begins reconstructing the data
and redundancy information. The array drive is now in the rebuild mode.
Obviously, no other hard disk drive may fail until all data has entirely been reconstructed on the hot
fix drive (because the system is operating without redundancy) without the array drive going into
error mode.