Asus PIKE 2108 PIKE 2108 user's manual - Page 33

Write Through, Always Write Back, Write Back with BBU, IO Policy, Direct, Cached, Drive Cache

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◊ W rite Through: In Write Through mode the controller sends a data transfer completion signal to the host when the drive subsystem has received all of the data in a transaction. ◊ A lways Write Back: In Writeback mode the controller sends a data transfer completion signal to the host when the controller cache has received all of the data in a transaction. This setting is recommended in Standard mode. ◊ W rite Back with BBU: In Writeback mode the controller sends a data transfer completion signal to the host when the controller cache has received all of the data in a transaction. This setting has to be used with a Battery Backup Unit (BBU). This is the default. • IO Policy: The IO Policy applies to reads on a specific virtual drive. It does not affect the read ahead cache. ◊ D irect: In direct I/O mode, reads are not buffered in cache memory. Data is transferred to the cache and the host concurrently. If the same data block is read again, it comes from cache memory. ◊ C ached: In cached I/O mode, all reads are buffered in cache memory. This is the default. • Drive Cache: Specify the drive cache policy: ◊ N oChange: Leave the current drive cache policy unchanged. This is the default. ◊ Enable: Enable the drive cache. ◊ D isable: Disable the drive cache. • Disable BGI: Specify the background initialization status: ◊ No: Leave background initialization enabled. This means that a new configuration can be initialized in the background while you use WebBIOS to do other configuration tasks. This is the default. ◊ Y es: Select Yes if you do not want to allow background initializations for configurations on this controller. • Select Size: Specify the size of the virtual drive in terabytes, gigabytes, megabytes, or kilobytes. Normally, this would be the full size for RAID 5 shown in the Configuration panel on the right. You may specify a smaller size if you want to create other virtual drives on the same drive group. 8. Click Accept to accept the changes to the virtual drive definition, or click Reclaim to return to the previous settings. 9. Click Yes to confirm the write policy mode you have chosen. 10. Click Next when you are finished defining virtual drives. The configuration preview screen appears. 11. Check the information in the configuration preview. ASUS PIKE 2108 2-19

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ASUS PIKE 2108
2-19
◊
Write Through:
In Write Through mode the controller sends a data
transfer completion signal to the host when the drive subsystem has
received all of the data in a transaction.
◊
Always Write Back:
In Writeback mode the controller sends a data
transfer completion signal to the host when the controller cache has
received all of the data in a transaction. This setting is recommended
in Standard mode.
◊
Write Back with BBU:
In Writeback mode the controller sends a data
transfer completion signal to the host when the controller cache has
received all of the data in a transaction. This setting has to be used
with a Battery Backup Unit (BBU). This is the default.
•
IO Policy:
The IO Policy applies to reads on a specific virtual drive. It
does not affect the read ahead cache.
◊
Direct:
In direct I/O mode, reads are not buffered in cache memory.
Data is transferred to the cache and the host concurrently. If the same
data block is read again, it comes from cache memory.
◊
Cached:
In cached I/O mode, all reads are buffered in cache memory.
This is the default.
•
Drive Cache:
Specify the drive cache policy:
◊
NoChange:
Leave the current drive cache policy unchanged. This is
the default.
◊
Enable:
Enable the drive cache.
◊
Disable:
Disable the drive cache.
•
Disable BGI
: Specify the background initialization status:
◊
No:
Leave background initialization enabled. This means that a new
configuration can be initialized in the background while you use
WebBIOS to do other configuration tasks. This is the default.
◊
Yes:
Select Yes if you do not want to allow background initializations
for configurations on this controller.
•
Select Size:
Specify the size of the virtual drive in terabytes, gigabytes,
megabytes, or kilobytes. Normally, this would be the full size for RAID 5
shown in the Configuration panel on the right. You may specify a smaller
size if you want to create other virtual drives on the same drive group.
8.
Click
Accept
to accept the changes to the virtual drive definition, or click
Reclaim
to return to the previous settings.
9.
Click
Yes
to confirm the write policy mode you have chosen.
10.
Click
Next
when you are finished defining virtual drives. The configuration
preview screen appears.
11.
Check the information in the configuration preview.