Raid Expansion; On-Line Raid Expansion - Compaq External RAID Controller & Subsystem Infortrend Operation Manual

Caching Optimization
Cache buffer sorting prior to cache flush operation
Gathering of writes during flush operation to minimize the number of IOs
required for parity update
Elevator sorting and gathering of drive IOs
Multiple concurrent drive IOs (tagged commands)
Intelligent, predictive multi-threaded read-ahead
Multiple, concurrent host IO threads (host command queuing)

RAID Expansion:

On-line RAID Expansion

Mode-1 RAID Expansion-
add Drive
Mode-2 RAID Expansion –
Copy and Replace drives
Expand Capacity with no
extra drive bays required
Operating system support
for RAID Expansion
B-4
RAID1
RAID3
RAID5
Supported.
Supported. Multiple drives can be added concurrently.
Supported. Replace members with drives of larger
capacity.
Supported in Mode 2 RAID expansion. Provide "Copy
and Replace Drive" function to replace drives with
drives of greater capacity. No need to add another
enclosure for the extra drives.
No. No operating system driver required. No software
has to be installed for this purpose.
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Infortrend