NEC Express5800/120Bb-6 Betriebsanweisung Seite 127

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Parameters for VD Definition
Listed below are the parameters of the Configuration Wizard:
Item
Parameter
Remarks
RAID Level
RAID 0 / RAID 1
Stripe Size
8 KB / 16 KB / 32 KB / 64 KB / 128 KB
Recommended value: 64KB
Access Policy
RW / Read Only / Blocked
Recommended value: RW
Read Policy
Normal / Ahead / Adaptive
Normal:
Normal is the default setting. Normal specifies that
the controller does not use read-ahead for the
current drive.
ReadAhead:
ReadAhead specifies that the controller uses
read-ahead for the current drive.
Adaptive:
Adaptive specifies that the controller uses
read-ahead if the two most recent disk accesses
occurred in sequential sectors.
Write Policy
WBack / WThru / BadBBU
WBack: Unavailable
WThru: WriteThru
BadBBU: Unavailable
IO Policy
Direct / Cached
Direct: Direct is the recommended setting.
Direct I/O does not buffer reads in cache memory.
Direct I/O transfers data to the cache and host
concurrently. If the same data block is read again,
the host reads it from cache memory.
Cached:
Cached I/O buffers all reads in cache memory.
Disk Cache Policy
Unchanged / Enable / Disable
Recommended value: Unchanged
Disable BGI
No / Yes
Specify whether to perform Background Initialize
after creation of VD.
Recommended value: No
Notice
The disk array controller does not support the BGI (Back Ground Initialize)
feature.
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