Adaptec 2130SLP User Guide - Page 80

Changing the Write Cache Setting, Changing the Stripe Size, Disabled write-through, Enabled write-back - battery

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Chapter 9: Managing Logical Drives and Hot Spares ● 79 Changing the Write Cache Setting The write cache setting determines when data is stored on a disk drive and when the controller communicates with the operating system. ● Disabled (write-through)-The controller sends (or writes) the data to a disk drive, then sends confirmation to the operating system that the data was received. Use this setting when performance is less important than data protection. ● Enabled (write-back)-The controller sends confirmation to the operating system that the data was received, then writes the data to a disk drive. Use this setting when performance is more important than data protection and you aren't using a battery-backup cache. Enabled is the default setting. ● Enabled (write-back) when protected by battery-The controller sends confirmation to the operating system that the data was received, then writes the data to a disk drive. Use this setting if you are using a battery-backup cache and performance is more important than data protection. Note: (RAID 10, 50, and 60 only) All logical drives within a RAID 10/ 50/60 logical drive must have the same write cache setting-either all write-through or all write-back. To quickly change the write cache setting, click the logical drive you want; then, in the menu bar, select Actions, click Configure write cache, then select Enabled or Disabled as required. Changing the Stripe Size The stripe size is the amount of data (in KB) written to one partition before the controller moves to the next partition in a logical drive. Stripe size options vary, depending on your controller. Normally, the default stripe size provides the best performance. For RAID 6 and RAID 60 logical drives, the more disk drives there are in the logical drive, the fewer the stripe size options.

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Chapter 9: Managing Logical Drives and Hot Spares
●
79
Changing the Write Cache Setting
The
write cache
setting determines when data is stored on a disk drive
and when the controller communicates with the operating system.
●
Disabled (write-through)
—The controller sends (or
writes
) the data
to a disk drive, then sends confirmation to the operating system that
the data was received. Use this setting when performance is less
important than data protection.
●
Enabled (write-back)
—The controller sends confirmation to the
operating system that the data was received, then writes the data to a
disk drive. Use this setting when performance is more important
than data protection and you aren’t using a battery-backup cache.
Enabled
is the default setting.
●
Enabled (write-back) when protected by battery
—The controller
sends confirmation to the operating system that the data was
received, then writes the data to a disk drive. Use this setting if you
are using a battery-backup cache and performance is more
important than data protection.
Note:
(
RAID 10, 50, and 60 only
) All logical drives within a RAID 10/
50/60 logical drive must have the same write cache setting—either all
write-through or all write-back.
To quickly change the write cache setting, click the logical drive you
want; then, in the menu bar, select
Actions
,
click
Configure write cache
,
then select
Enabled
or
Disabled
as required.
Changing the Stripe Size
The
stripe size
is the amount of data (in KB) written to one partition
before the controller moves to the next partition in a logical drive.
Stripe size options vary, depending on your controller. Normally, the
default stripe size provides the best performance.
For RAID 6 and RAID 60 logical drives, the more disk drives there are
in the logical drive, the fewer the stripe size options.