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Intel® Server RAID Controller U3-1 User’s Manual Rev 1.0 5-13
RAID Features
5.2.8 Caching
5.2.8.1 Downstream Write-Through
The RAID controller cache is used to buffer write data until it is written to disk. Data in the cache
is not available to be read from the cache directly. This type of caching is enabled by default when
no other cache type (Sequential or Full Write Back) is selected.
5.2.8.2 Sequential Write-Back
The host operating system is given a successful write reply immediately while the write data is held
in the RAID controller cache until the actual write to disk occurs. Only data determined to be
sequential is cached.
5.2.8.3 Full Write-Back
The host operating system is given a successful write reply immediately while the write data is held
in the RAID controller cache until the actual write to disk occurs. Caching occurs for both
sequential and random data.
Note: Intel Integrated RAID software provides write-back cache capability to improve host performance
for certain types of applications. Applications which may benefit from the write-back cache
None Available Formatted OK
No action can be taken while the drive is being formatted.None Available Formatting
None Available Offline
None Available OK
No action will be taken.
None In Use Failed
None In Use OK
None
Pass-
through
Ok
None Spare OK
None In Use Offline
Pass-through to
Host
Available OK
Drive is not controlled by RAID firmware and thus cannot
be a part of a RAID volume. The drive will be available to
the operating system as an individual disk.
Release Spare Spare OK Convert a spare to an available drive.
None
Available,In
Use, Pass-
through,
Spare
Alarm-service
Indicates that the disk drive has reported a S.M.A.R.T
event and may be in need of service or replacement. See
the specific disk drive manufacturer documentation for
details including error codes, utilities, etc.
None In Use
Incompatible
Version
Drive is not controlled by RAID firmware and thus cannot
be a part of a RAID volume. The drive will be available to
the operating system as an individual disk.
Table 5-13. Disk Actions, Usage and Status
Disk Action Usage Status Description if Submitted and Confirmed