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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Results of a Hard Disk Drive Failure
Results of a Hard Disk Drive Failure
Depending on the circumstances, there can be several possible results
from a drive failure.
Example 1 :
- Only one hard disk drive fails.
- A hot-spare drive is defined that is
the same or greater size than the failed drive.
- The logical drives in the array
are assigned RAID level 1, level 5, or
a combination of these two levels.
Then the hot spare drive will take over immediately.
NOTE:
Hot-spare drive capability does not apply to logical drives
assigned RAID level 0.
Data for logical drives assigned RAID levels 1 and 5 is maintained,
howevwer, system performance will be reduced.
Example 2 :
- Only one hard disk drive fails.
- A hot-spare drive
is not defined or is a different size from the failed drive.
- The logical drives in the array
are assigned RAID levels 1, 5,
or a combination of these two levels.
Then no data will be lost, but the
system will operate at reduced performance until the defunct drive
is replaced and rebuilt.
Example 3 :
If more than one drive in an array fails,
all the data is lost in all of the logical drives of the array.
For this reason,
it is important that you replace and rebuild
a defunct drive as soon as possible.
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