Caching Operation - Compaq External RAID Controller & Subsystem Infortrend Operation Manual

Host LUN Geometry
User Configurable Default
Geometry:
User Configurable
Geometry range:
Drive Motor Spin-up
Drive-side Tag Command
Queue
Host-side Maximum
Queued I/O count
Maximum concurrent Host
LUN connection
Number of Tags Reserved
for each Host-LUN
connection
Controller/Logical Drive
Shutdown
Drive I/O timeout
IO channel diagnostics
Drive Roaming

Caching Operation:

Write-back Cache
Write-through Cache
Supported Memory type
Read-ahead Operation
Multi-Threaded Operation
Scatter / Gather
I/O sorting
Variable Stripe Size
Firmware Functionality Specifications
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)
Sector: 32, 64, 127, 255 or Variable
Head: 64, 127, 255 or Variable
Cylinder: <1024, <32784,<65536 or Variable
Supported. The controller will send spin-up (start unit)
command to each drive at the 4 sec. intervals.
Supported. User adjustable up to 128 for each drive
User adjustable up to 1024
User adjustable up to 64
User adjustable up to 256
Turns controller or specific logical drive into a state that
does not receive I/Os. This function is available
through OEM "iappend" program.
User adjustable
Supported
Supported
Supported.
Supported.
SDRAM memory for enhanced performance
Fast Page Memory with Parity for enhanced data
security
Intelligent Dynamic read-ahead operation for
sequential data accessing
Yes
Supported
Supported. Optimized I/O sorting for enhanced
performance
Opt. for Sequential
I/O
RAID0
Opt. for
Random I/O
128 32
B-3