Rebuild Rate; Hot Swap; Drive States - Lenovo ThinkServer RD330 Software User's Manual
Megaraid sas software user guide
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Also See for ThinkServer RD330:
- Safety information manual (288 pages) ,
- Benutzerhandbuch (212 pages) ,
- Guía del usuario (202 pages)
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Chapter 2: Introduction to RAID
Components and Features
2.4.14
Rebuild Rate
2.4.15
Hot Swap
2.4.16
Drive States
Page 30
The rebuild rate is the percentage of the compute cycles dedicated to rebuilding failed
drives. A rebuild rate of 100 percent means that the system gives priority to rebuilding
the failed drives.
The rebuild rate can be configured between 0 percent and 100 percent. At 0 percent,
the rebuild is done only if the system is not doing anything else. At 100 percent, the
rebuild has a higher priority than any other system activity. Using 0 or 100 percent is
not recommended. The default rebuild rate is 30 percent.
A hot swap is the manual replacement of a defective drive unit while the computer is
still running. When a new drive has been installed, a rebuild occurs automatically if:
The newly inserted drive is the same capacity as or larger than the failed drive.
It is placed in the same drive bay as the failed drive it is replacing.
The RAID controller can be configured to detect the new drives and rebuild the
contents of the drive automatically.
A drive state is a property indicating the status of the drive. The drive states are
described in Table 4.
Table 4:
Drive States
State
Online
A drive that can be accessed by the RAID controller and is part of the virtual
drive.
Unconfigured
A drive that is functioning normally but is not configured as a part of a
Good
virtual drive or as a hot spare.
Hot Spare
A drive that is powered up and ready for use as a spare in case an online
drive fails.
Failed
A drive that was originally configured as Online or Hot Spare, but on which
the firmware detects an unrecoverable error.
Rebuild
A drive to which data is being written to restore full redundancy for a virtual
drive.
Unconfigured Bad A drive on which the firmware detects an unrecoverable error; the drive was
Unconfigured Good or the drive could not be initialized.
Missing
A drive that was Online but which has been removed from its location.
Offline
A drive that is part of a virtual drive but which has invalid data as far as the
RAID configuration is concerned.
When a virtual drive with cached data goes offline, the cache for the virtual
drive is discarded. Because the virtual drive is offline, the cache cannot be
saved.
MegaRAID SAS Software User Guide
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