Adaptec 2169400-R User Guide - Page 72

Changing the Stripe Size, Changing the Write Cache Setting, Apply, Schedule, Disabled write-through

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Chapter 6: Managing Logical Drives and Hot Spares ● 72 2 Modify the available settings as required for your logical drive (not all options are available for all controllers or all RAID levels): ● Logical drive size (see page 68) ● Stripe size (see the following section) ● Write cache (see further down on this page) ● Read cache (see page 73) ● Initialize priority (see page 73) ● Initialize method (see page 73) 3 Click Next. 4 To apply the changes immediately, click Apply. To schedule the changes for later, click Schedule, then set the date and time. (For more information, see Scheduling a Task on page 110.) 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. 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. 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: 1 Click the logical drive you want. 2 In the menu bar, select Actions, click Configure write cache, then select Enabled or Disabled as required. The write cache setting is changed.

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Chapter 6: Managing Logical Drives and Hot Spares
●
72
2
Modify the available settings as required for your logical drive (not all options are available
for all controllers or all RAID levels):
●
Logical drive size (see
page 68
)
●
Stripe size (see the following section)
●
Write cache (see further down on this page)
●
Read cache (see
page 73
)
●
Initialize priority (see
page 73
)
●
Initialize method (see
page 73
)
3
Click
Next
.
4
To apply the changes immediately, click
Apply
.
To schedule the changes for later, click
Schedule
, then set the date and time. (For more
information, see
Scheduling a Task
on page 110
.)
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.
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.
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:
1
Click the logical drive you want.
2
In the menu bar, select
Actions
,
click
Configure write cache
, then select
Enabled
or
Disabled
as required.
The write cache setting is changed.