Compaq Infortrend manual RAID Expansion, Caching Optimization

RAID1	128	32
RAID3	16	4
RAID5	128	32

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

B-4 Infortrend