HP LH4r HP NetServer FCArray Assistant - Installation and User Guide - Page 57

Enable Automatic Rebuild Management, Enable Read Ahead, Rebuild Rate, Spin-up, Devices Between Spins

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Chapter 4 Configuration The Controller Options dialog box provides the following options to select from. See Figure 4-22. Enable (by checking) or Disable (by un-checking) any of the following Global Parameters: • Enable Automatic Rebuild Management - Works in conjunction with AEMI or SAF-TE disk array enclosures to detect removal of a failed drive and perform an automatic rebuild after installation of a replacement drive. Do not disable this unless you are sure of the consequences. • Enable Read Ahead - Reads data to the next stripe boundary (based on stripe size) and retains in cache data beyond the size of the read request. • Rebuild Rate - Change the default Rebuild Rate to less than 50. A rate of 50 devotes the maximum allowable resources to a drive rebuild or array expansion, allowing the Rebuild or Expand to proceed at its fastest pace. Lowering the number devotes more resources to I/Os and consequently slows the Rebuild or Expand process. Change any of the following Startup Parameters: • Spin-up - Change if you do not want automatic drive spin-up. Other choices are to spin up at power on, or to wait for a command and then do an automatic drive spin-up. • Devices Between Spins - Number of devices to spin up at one time. A low number lessens the likelihood of a power drain. Valid settings are 1 through 8. • Initial Delay - Number of seconds to wait before spinning up the first disk set. Valid settings are 0 through 255. • Sequential Delay - Number of seconds between consecutive device spin-up cycles. Valid settings are 0 through 255. Change any of the following SCSI Parameters: • Channel - This selects a channel and its current data for viewing. • 16-bit or 8-bit - Determines if the channel will negotiate 8-bit or 16-bit transfers. • Maximum data transfer rate of the disk side channels. Speeds are Asynchronous, 5 MHz, 8 MHz, 10 MHz, 20 MHz, and 40 MHz (LVD only). 51

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Chapter 4
Configuration
51
The Controller Options dialog box provides the following options to select from.
See Figure 4-22.
Enable (by checking) or Disable (by un-checking) any of the following Global
Parameters:
•
Enable Automatic Rebuild Management
- Works in conjunction with
AEMI or SAF-TE disk array enclosures to detect removal of a failed drive
and perform an automatic rebuild after installation of a replacement drive.
Do not disable this unless you are sure of the consequences.
•
Enable Read Ahead
- Reads data to the next stripe boundary (based on
stripe size) and retains in cache data beyond the size of the read request.
•
Rebuild Rate
- Change the default Rebuild Rate to less than 50. A rate of
50 devotes the maximum allowable resources to a drive rebuild or array
expansion, allowing the Rebuild or Expand to proceed at its fastest pace.
Lowering the number devotes more resources to I/Os and consequently
slows the Rebuild or Expand process.
Change any of the following Startup Parameters:
•
Spin-up
- Change if you do not want automatic drive spin-up. Other
choices are to spin up at power on, or to wait for a command and then do
an automatic drive spin-up.
•
Devices Between Spins
- Number of devices to spin up at one time. A low
number lessens the likelihood of a power drain. Valid settings are 1
through 8.
•
Initial Delay
- Number of seconds to wait before spinning up the first disk
set. Valid settings are 0 through 255.
•
Sequential Delay
- Number of seconds between consecutive device
spin-up cycles. Valid settings are 0 through 255.
Change any of the following SCSI Parameters:
•
Channel
- This selects a channel and its current data for viewing.
•
16-bit
or
8-bit
- Determines if the channel will negotiate 8-bit or 16-bit
transfers.
•
Maximum data transfer rate of the disk side channels. Speeds are
Asynchronous
,
5 MHz
,
8 MHz
,
10 MHz
,
20 MHz
, and
40 MHz
(LVD
only).