Recovering or replacing a drive
Some drive failures require drive replacement, others only require performing a recovery
process. Use the recovery process to ensure that all partitions are recovered before
proceeding with any further drive recovery or replacement procedures. Unless you are
certain the drive has failed, perform a drive recovery.
Important: Do not attempt to replace or recover a drive without the
assistance of Hitachi Vantara Customer Support. For the latest procedure,
please refer to Support Connect article
How_to_Replace_a_Chassis_Hard_Disk_in_an_HNAS_Gateway_Node (which is
only visible to service partners and employees).
Drives can fail for a number of reasons, including corrupt sectors or erroneous blocks of
data. Typically, the RAID controller handles these types of errors and they do not cause
the server to fail.
More serious errors may cause a drive failure, causing one or both drives to fall out of
the RAID. Should one partition of a drive fail, attempt a disk recovery. If a partition fails
repeatedly, replace the drive. If all the partitions fall out of RAID, replace the failed drive.
Caution: When removing a drive, take extreme care to only press one lever.
The push button latch mechanisms are close together and, if not careful, both
latches can easily be depressed at one time. This causes an immediate loss of
access.
Important: Before you consider replacing a drive, note the following points:
■
Failed drives are hot-swappable, so a failed drive can be replaced without
shutting down the server. However, there are serious risks in trying to
swap a drive that has not failed.
■
Do not assume that because the red LED is illuminated that a drive is
faulty. Under a RAID rebuild/recovery, the red LED is illuminated. If the
drive fails and must be replaced, remove it from the server.
■
If the drive shows signs of failure (through warning events in the event
log), the drive can be replaced as it is hot-swappable.
■
Do not pull out a drive that is in a known good configuration. Doing so can
potentially lead to data corruption.
■
Unless you are certain the drive has failed, perform a disk recovery.
■
Drive redundancy is unsupported if the drive is removed from the server.
■
The new drive does not require the same capacity as the drive being
replaced.
WARNING: It is strongly recommended that you perform drive replacement
procedures during a maintenance window to minimize risk of any disruption
caused by the procedure and to allow for the movement of EVSs and other
unexpected events that may occur.
Recovering or replacing a drive
Chapter 5: Replacing server components
Hitachi NAS Platform Series 5000 Hardware Reference
44
