Hitachi HF-W2000 35 User Manual page 14

 Although this Equipment featuring RAID1 is more reliable than general systems,
it is still prone to the loss of data in the HDDs. Not only a machine failure but
also an unexpected power failure or an operation error may cause data to be lost
for good. To prevent such loss of data, implement scheduled data backup in
daily operation. Also, protect the power source from undesirable interruptions
by such means as UPS.
 This Equipment is evaluated based on the specific HDD models authorized by
the Manufacturer. Replace only with specific HDD models authorized by the
Manufacturer. Otherwise, the existing data in the HDD may be lost. Also,
always observe the recommended replacement interval for HDDs (Section 5.3,
"Replacement of Consumable Parts").
 Since each Equipment has its own RAID1 configuration information (e.g., serial
number), you cannot swap HDDs even between two units of this Equipment. If
you dare, the stored data in the newly installed HDD will be erased with
automatic RAID1 rebuilding process due to inconsistency of the RAID1
configuration information. If you own multiple units of this Equipment, manage
use and inventory of HDDs so that they are not inadvertently mixed.
 Each Equipment contains uniquely assigned HDD serial numbers in its own
RAID1 configuration information. Accordingly, if you create a copy of the
existing HDD without using the RAID1 rebuilding process, the copy will be
recognized new and invalid. This new HDD, if installed in the drive bay, will
not start up the Equipment.
 Maintenance of a disk array system requires in-depth knowledge. In case of an
operation error, data in the HDD may be lost.
 When you newly build a RAID1 system on the Equipment, the setup process
writes the RAID1 configuration information, which only applies to this specific
serial numbered Equipment. Since these HDDs containing such RAID1
configuration information are not usable on any other Equipment with a different
serial number, manage handling and inventory of HDDs so that they are not
inadvertently mixed if you own multiple units of this Equipment. Should a
wrong HDD be installed, the Equipment may not start up or you may lose data
stored in the HDD due to inconsistency of the RAID1 configuration information.
 When you newly build a RAID1 system on the Equipment, prepare two new
units of specific HDD models authorized by the Manufacturer. If you use an
unauthorized HDD, you may lose data stored in the HDD.
SAFETY SUMMARY (Continued)
S-11
(See Section 9.1 on page 9-1.)
(See Section 9.2 on page 9-2.)