Raid expansion, Redundant controllers, Raid e – Dot Hill Systems SANnet II 200 User Manual

Page 26: Xpansion, Edundant, Ontrollers

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Head: 64,127,255 or variable
Cylinder: <1024, <32784,<65536 or variable

Drive motor spin-up

Supported
The controller will send spin-up (start unit) command to each
drive at 4 sec. intervals.

Drive-side tag command queue

Supported
User adjustable up to 128 for each drive

Host-side maximum queued I/O count

Supported
User adjustable up to 1024

Maximum concurrent host LUN connection

Supported
User adjustable up to 64

Number of tags reserved for each host LUN
connection

Supported
User adjustable up to 256

Drive I/O timeout

Supported
User adjustable

RAID Expansion

On-line RAID expansion

Supported

Mode-1 RAID expansion-add drive

Supported
Multiple drives can be added concurrently.

Mode-2 RAID expansion – copy and
replace drives

Supported
Replace members with drives of larger capacity.

Expand capacity with no extra drive bays
required

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.

Operating environment support for RAID
expansion

No operating environment driver required. No software has to be
installed for this purpose.

Redundant Controllers

Active-active redundant controller

Supported

Synchronized cache for both controllers

Supported
Through a dedicated synchronizing channel, synchronized cache
over Fibre loops is supported.

Write-back cache enabled in redundant
controller mode

Supported
Using synchronized cache connection between controllers.

Automatic failover

Supported

Automatic failback

Supported

Controller hot-swap

Supported
Support on-line hot-swap of the failed controller. There is no need
to reset or shutdown the failed controller. One redundant
controller can be pulled out during use.

Redundant controller communication
channel

RAID: SCSI; RCC Reset signals built-in

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