HP 50 StorageWorks Modular Smart Array 50 Storage Enclosure Maintenance and Se - Page 11

These cases are the exceptions, In RAID ADG configurations

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Removal and replacement procedures 11 To minimize the likelihood of fatal system errors, take these precautions when removing failed drives: • Do not remove a degraded drive if any other drive in the array is offline (the Online LED is off). In this situation, no other drive in the array can be removed without data loss. Exceptions: - When RAID 1+0 is used, drives are mirrored in pairs. Several drives can be in a failed condition simultaneously (and they can all be replaced simultaneously) without data loss, as long as no two failed drives belong to the same mirrored pair. - When RAID ADG is used, two drives can fail simultaneously (and be replaced simultaneously) without data loss. - If the offline drive is a spare, the degraded drive can be replaced. • Do not remove a second drive from an array until the first failed or missing drive has been replaced and the rebuild process is complete. (The rebuild is complete when the Online LED on the front of the drive stops blinking.) These cases are the exceptions: - In RAID ADG configurations, any two drives in the array can be replaced simultaneously. - In RAID 1+0 configurations, any drives that are not mirrored to other removed or failed drives can be simultaneously replaced offline without data loss. To remove the component: CAUTION: To prevent improper cooling and thermal damage, do not operate the storage enclosure unless all bays are populated with either a component or a blank. 1. Determine the status of the hard drive from the hot-plug hard drive LEDs. 2. Back up all data on the hard drive.

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Removal and replacement procedures
11
To minimize the likelihood of fatal system errors, take these precautions when
removing failed drives:
•
Do not remove a degraded drive if any other drive in the array is offline (the
Online LED is off). In this situation, no other drive in the array can be
removed without data loss.
Exceptions:
–
When RAID 1+0 is used, drives are mirrored in pairs. Several drives can
be in a failed condition simultaneously (and they can all be replaced
simultaneously) without data loss, as long as no two failed drives belong
to the same mirrored pair.
–
When RAID ADG is used, two drives can fail simultaneously (and be
replaced simultaneously) without data loss.
–
If the offline drive is a spare, the degraded drive can be replaced.
•
Do not remove a second drive from an array until the first failed or missing
drive has been replaced
and
the rebuild process is complete. (The rebuild is
complete when the Online LED on the front of the drive stops blinking.)
These cases are the exceptions:
–
In RAID ADG configurations, any two drives in the array can be replaced
simultaneously.
–
In RAID 1+0 configurations, any drives that are not mirrored to other
removed or failed drives can be simultaneously replaced offline without
data loss.
To remove the component:
CAUTION:
To prevent improper cooling and thermal damage, do
not operate the storage enclosure unless all bays are populated with
either a component or a blank.
1.
Determine the status of the hard drive from the hot-plug hard drive LEDs.
2.
Back up all data on the hard drive.