External RAID Controller & Subsystem Operation Manual

RAID Planning
2-10
2.4 Tunable Parameters
Fine-tune the controller and the array parameters for your host
applications. Although the factory defaults guarantee the optimized
controller operation, you may refer to the table below to facilitate
tuning of your array. Some of the performance and fault-tolerance
settings may also be changed later during the preparation process of
your disk array.
Take this table as a check list and make sure you have each item set
to an appropriate value.
Table 2 - 2 Controller Parameter Settings
➀
➀➀
➀
Parameters that should be configured at the initial stage of system
configuration
➁
➁➁
➁
Parameters that can be changed later
➂
➂➂
➂
Non-critical
User-Defined
Parameters
Default Alternate Settings
Fault Management:
➀
Automatic Logical
Drive Rebuild - Spare
Drive
Enabled when
Spare Drive is
available
RAID 1 + Local Spare
RAID 3 + Local Spare
RAID 5 + Local Spare
Global Spare
➀
S.M.A.R.T.
Disabled Detect Only
Perpetual Clone
Clone + Replace
➂
Clone Failing Drive
Manual function Replace After Clone
Perpetual Clone
➀
Rebuild Priority
Low (higher
priority requires
more system
resource)
Low
Normal
Improved
High
➀
Verification on Write
Disabled On LD Initialization
On LD Rebuild
On Normal Drive Writes
➂
SDRAM ECC
Disabled Enabled
➀
Event Notification
Reports to user
interface and
onboard alarm
Over Dial-out Modem
Over SNMP Trap
Over Java-Based Management
Software
➀
System Events
System default Upper and Lower event triggering
thresholds configurable
Controller:
➀
Channel Mode
* Host, Drive, RCCOM, Drive +
RCCOM
➀
Host and Drive channel IDs
**
➀
Controller Unique
Identifier
Preset on
some
models
hex number from 0 to FFFFF (FW 3.25
and above)
➁
Data rate
Auto Depends on problems solving