NEC N8403-019, Японская инструкция пользователя

Страница: 127 / 146

107
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.