Connecting Hardware Devices
Small Computer Systems Interface (SCSI)
77
Mirrored Drive RAID Configuration Failure (RAID 1)
When a hard disk drive fails in a mirrored array, the system takes the sub-mirror the drive
is a part of, off-line. The system routes all data access to the remaining sub-mirror until
the failed drive is either hot-swapped or repaired. The performance of a degraded
mirrored RAID 1 is equal to the performance rendered by the remaining hard disk drive.
Parity RAID Configuration Failure (RAID 5)
The data in a RAID 5 array is kept in an
encoded format
and
distributed across the
number of independent drives in the array. Consequently, write operations on a parity
RAID array are slightly slower. This is true even if the parity RAID is functioning normally.
When a hard disk drive in a parity RAID fails, every other hard disk drive in the array is
needed to recover the failed hard disk drives data and to complete the repair operation.
If the Server Does Not Have a RAID Controller
If the server is not configured with a RAID controller, the status indicator of each hard
disk drive will not be able to display which drive is faulty.
The server’s four hard disk drive bays are hot-swappable, allowing you to remove any
drive while the server is running. However, removing a critical system drive or a data
drive that is routinely accessed by system applications and/or users may cause a severe
system failure if the drive is removed while the server is running.
TECHNICAL NOTE: If your server is equipped with a RAID controller, but Power
Console (Windows NT) and MegaRAID Manager (NetWare) are not installed, you
can replace a faulty hard disk drive while the server is running, but you won’t be
able to recover (rebuild) the disk array.
CAUTION: Use extreme caution when removing a hard disk drive. To avoid a severe
system failure, while the server is running never attempt to replace a critical system
drive (i.e., the drive with on which the Windows NT Partition is stored) or data drive
that is routinely accessed by system applications and/or users.
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