Item Specification
Capacity (GB) 512
NAS module Cache Capacity DDR3 DIMM 8GB x 12 [Slot]
Note:
• All 12 slots must be fully installed
with DIMMs.
• Each DIMM is replaceable when they
fail.
• The DIMM is not common and
cannot be used with DKC DIMM.
Control method Read LRU, Write after
Battery backup Provided
Backup duration Unrestricted (saving to a nonvolatile memory)
Data in the cache memory is preserved against power failures. If a power
outage occurs, data in cache memory is written to drives.
When the storage system enters Cache Backup mode, the amber WARNING
LED goes on to when the system starts. This warning indicates that the
battery charge has dropped significantly and the remaining battery capacity
is not sufficient; the storage system will continue operating with the Write
Cache function disabled.
When the battery is charged, the warning indication disappears, and the
storage system continues the operation in the Write Cache function.
The warning indication disappears within six hours. Even when the warning is
shown, normal operation is assured in Write-Through. Read and write
performance is lowered because the Write Cache function is disabled.
If the storage system is not charged for more than six months, the battery
can become overcharged and sustain unrecoverable damage. To avoid this
situation, charge the battery more than 3 hours every six months.
Insulation performance
Item
Specification
Insulation withstand voltage AC 1,500 V (100 mA, 1 min)
Insulation resistance DC 500 V, 10 M Ω or more
Storage system specifications 113
Hitachi Virtual Storage Platform G800 Hardware Reference Guide
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