Grass Valley PRS 250 RAID Storage System - Manual (Page 56)

Chapter 3 Servicing the System
3-10 RAID Instructions
Changing Physical Disk Unit Parameters
You can change the Rebuild time for a physical disk unit after it is bound:
Changing the Rebuild Time
The rebuild time is the amount of time that the storage chassis allots to reconstruct the
data on a new disk module that replaces a failed disk module in a logical unit. It
applies to all RAID physical disk units. The time you specify determines the amount
of resource the SP devotes to rebuilding instead of to normal I/O activity.
The default time of 24 hours is adequate for most situations. A rebuild time of less
than 24 hours rebuilds the disk more quickly, but degrades response time. A rebuild
time of 0 hours rebuilds the disk module as quickly as possible, but degrades response
time significantly. If your site requires fast response time and you want to minimize
degradation to normal I/O activity, you can extend the rebuilding process over a
longer period of time.
NOTE: The actual rebuild time can differ significantly from the time you specify,
especially between a 2-channel and a 4-channel Profile system.
To change the rebuild time for a physical disk unit:
IMPORTANT You cannot change the rebuild time for a physical disk unit
while the unit is rebuilding.
1. From the GridMgr Main Menu, follow this menu path:
Change Parameters
→
Change Physical Unit Parameters
→
Change Unit Rebuild Time
The Change Unit Rebuild Time screen appears.
2. Enter the number of the physical disk unit whose rebuild time you want to change.
The program displays the current rebuild time and prompts you for a new time as
follows:
Current rebuild time is 4 hours.
Enter new rebuild time :
SP A Change Unit Rebuild Time
SP SCSI ID 0
At any prompt, enter ^ to GO BACK TO PREVIOUS MENU or ? for HELP
Physical unit to change (hex)?