Compaq External RAID Controller & Subsystem Infortrend - Caching Operation

Firmware Functionality Specifications
B-3
Host LUN Geometry
User Configurable Default
Geometry:
1. Capacity <64GB: Head=63, Sector=32, Cylinder=?
(depends on capacity)
2. 64GB<capacity<128GB:Head=64, Sector=64,
Cylinder=? (depends on capacity)
3. 128GB<capacity<256GB: Head=127, Sector=64,
Cylinder=? (depends on capacity)
4. 256GB<capacity<512GB: Head=127, Sector=127,
Cylinder=?
5. 512GB<capacity<1TB: Head=255, Sector=64,
Cylinder=? (depends on capacity)
6. 1TB<capacity: Head=225, Sector=225, Cylinder=?
(depends on capacity)
User Configurable
Geometry range:
Sector: 32, 64, 127, 255 or Variable
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 the 4 sec. intervals.
Drive-side Tag Command
Queue
Supported. User adjustable up to 128 for each drive
Host-side Maximum
Queued I/O count
User adjustable up to 1024
Maximum concurrent Host
LUN connection
User adjustable up to 64
Number of Tags Reserved
for each Host-LUN
connection
User adjustable up to 256
Controller/Logical Drive
Shutdown
Turns controller or specific logical drive into a state that
does not receive I/Os. This function is available
through OEM “iappend” program.
Drive I/O timeout
User adjustable
IO channel diagnostics
Supported
Drive Roaming
Supported
Caching Operation:
Write-back Cache
Supported.
Write-through Cache
Supported.
Supported Memory type
SDRAM memory for enhanced performance
Fast Page Memory with Parity for enhanced data
security
Read-ahead Operation
Intelligent Dynamic read-ahead operation for
sequential data accessing
Multi-Threaded Operation
Yes
Scatter / Gather
Supported
I/O sorting
Supported. Optimized I/O sorting for enhanced
performance
Opt. for Sequential
I/O
Opt. for
Random I/O
Variable Stripe Size
RAID0
128 32