Hitachi HF-W2000 35 User Manual page 16

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 The Equipment features RAID1 and is highly reliable compared to a system with
a conventional configuration. Nonetheless, the data stored on the HDDs may be
lost depending on the type of the failure. In addition to equipment failure data
can also be lost by power failure and human mistakes during operation. Should
such situation occur, the data cannot be recovered. In order to prevent data loss,
make it a routine to save your data and establish a systematic way of backup. In
addition, increase the reliability of power supply by, for example, using a UPS.
 The Equipment is evaluated under the assumption that the HDD models
specified by HITACHI are used. When you replace an HDD, use the HDD
models specified by HITACHI. Otherwise, the data stored in the HDDs may be
lost. Stick to the recommended replacement cycle when you replace an HDD.
(See Section 5.3, "Replacement of Consumable Parts".)
 The Equipment manages the unique serial number of each HDD (each HDD has
a different serial number) as part of RAID1 configuration information.
Therefore, if you copy the contents of an HDD to another HDD without using
the rebuild function of the software RAID1 construction utility, the HDD with
the copied contents is recognized as an invalid medium. Even if you mount the
HDD to a drive bay, the Equipment will not start.
 Maintenance of a disk array system requires a high level of expertise. Should
any mistakes be made during the maintenance work, data stored in the HDDs
may be lost.
 When you build software RAID1 from scratch, the unique serial number of each
HDD (each HDD has a different serial number) is stored in the HDDs as part of
RAID1 configuration information. If you use multiple sets of Equipment, pay
attention when you handle and store the HDDs so that the HDDs are not mixed
up. Otherwise, RAID1 configuration information mismatch occurs, and the
Equipment may not start up, and the data in the HDDs may be lost.
 When you build software RAID1 from scratch, prepare two new HDDs selected
from the models specified and tested by HITACHI. Otherwise, the data stored in
the HDDs may be lost.
SAFETY SUMMARY (Continued)
S-13
(See Section 10.1 on page 10-1.)
(See Section 10.2 on page 10-3.)

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