Read Sharp MX-6500N / MX-7500N (serv.man25) Service Manual online
MX-7500N VARIOUS STORAGE DATA HANDLING 11 – 14
6. Note for installing and repairing the mirroring kit
When installing or repairing the mirroring kit, fully understand the following descriptions to avoid erroneous handling and procedures. When a
HDD which has once been used for the mirroring kit is reused without proper preparation, it may cause an error and destruction of user data, or
other troubles.
HDD which has once been used for the mirroring kit is reused without proper preparation, it may cause an error and destruction of user data, or
other troubles.
The following three cases must be strictly avoided.
- When newly installing a mirroring kit, do not use one which has been once used.
- When replacing the HDD because of a HDD trouble, do not replace it with a HDD which has been once used in a mirroring kit.
- When replacing the HDD because of a HDD trouble in the machine, do not replace it with a HDD which has been once used in a mirroring kit.
NOTE: When a HDD is once used in a mirroring kit, the mirroring information is written into the HDD. This causes a trouble by erroneous
using.
The details of inhibited items, results of erroneous procedures, and precautions for avoiding those errors are described below.
A. Details of inhibited items
(1)
When newly installing a mirroring kit, do not use one which has been once used.
Trouble contents
If HDD2 which has been once used is used for new installation of a mirroring kit, the data in HDD2 will be written into HDD1. This causes era-
sion of the original user data, freeze of the machine, or other troubles. The "HDD which has been once used" includes a HDD which was just
installed and conducted only.
sion of the original user data, freeze of the machine, or other troubles. The "HDD which has been once used" includes a HDD which was just
installed and conducted only.
Countermeasures
Use a new mirroring kit for installation.
If there is no choice but to use a mirroring kit which has been once used, be sure to erase the mirroring information in the HDD before installa-
tion. (For details, refer to "5-C. Deleting the HDD mirroring information.")
tion. (For details, refer to "5-C. Deleting the HDD mirroring information.")
User data
Mirroring kit side
Machine side
MFP control
PWB
HDD1
HDD2
RAID PWB
RAID
controller
MFP control
PWB
Mirroring kit which has been once used
No mirroring
information
User data
Machine side
HDD
Mirroring kit side
HDD1
HDD2
RAID PWB
User
data
data
No mirroring
information
write
HDD1
HDD2
RAID PWB
Rebuild start
HDD1
HDD2
RAID PWB
Before installation of the mirroring kit
Installation of a mirroring kit which has been once used
Boot
→ The mirroring information is written.
Rebuild
Rebuild complete
→ The HDD2 data is overwritten into the user data
area of HDD1.
Approx. after 1 hour
Mirroring
information A
Since the mirroring
information area in
HDD1 is empty, the
mirroring information is
written into it.
information area in
HDD1 is empty, the
mirroring information is
written into it.
Since HDD2 acts as the master, the HDD2
data is overwritten into HDD1, erasing the
user data of HDD1.
data is overwritten into HDD1, erasing the
user data of HDD1.
MFP control
PWB
MFP control
PWB
MFP control
PWB
RAID
controller
Mirroring kit which has been once used
Mirroring
information A
Mirroring
information A
Machine side
Mirroring kit side
Machine side
RAID
controller
Mirroring kit which has been once used
Mirroring
information A
Mirroring
information A
Data
overwriting
during
rebuilding
overwriting
during
rebuilding
Mirroring kit side
Machine side
RAID
controller
Mirroring kit which has been once used
Mirroring
information A
Mirroring
information A
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