Gateway 9510 User Manual page 128

Configuring your ROMB RAID solution with the RAID BIOS Console configuration utility
12
Select the
Write Policy
Use this screen to select the write and cache policies. The write policy parameter
specifies the cache write policy. You can set the write policy to
. In
Write-through
signal to the host when the controller cache receives all the data in a transaction. In
caching, the controller sends a data transfer completion signal to the
Write-through
host after the disk subsystem receives all the data in a transaction.
caching is the default setting.
caching.
Write-back
caching, but it should only be enabled when the optional battery backup module is
installed.
Caution
13
Select the
Cache Policy
The cache policy applies to I/O on a specific logical drive. It does not affect the read
ahead cache. The options are
cache memory.
Direct I/O
does not override the cache policy settings.
I/O
the host concurrently. If the same data block is read again, the host reads it from cache
memory.
14
Select the
Span
Enable or disable the spanning mode for the current logical drive. If spanning is
enabled, the logical drive can occupy space in more than one array. If spanning is
disabled, the logical drive can occupy space in only one array.
For two arrays to be spannable, they must have the same stripe width and must be
consecutively numbered. If these criteria are not met, the utility ignores the Span
setting.
Spanning lets the logical drive stripe across multiple arrays. Using this option enables
the use of RAID 10 and RAID 50.
from the list.
caching, the controller sends a data transfer completion
Write-back
Write-through
caching has a performance advantage over
Write-back
Do not use write-back caching for any logical drive in a Novell
NetWare volume.
from the list.
Cached I/O
does not buffer reads in cache memory. When possible,
from the list.
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caching has a data security advantage over
or .
Direct I/O Cached I/O
transfers data to cache and
Direct I/O
or
Write-back
Write-through
Write-through
buffers all reads in
Direct
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