3Ware 3W-6800 User Guide - Page 43

Confirm array configuration, For RAID 5 Arrays, For RAID 1 or 10 Arrays

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3ware Disk Array Configuration Utility There may be instances when you always want the computer to wait for the drive to write all the data to disk before going on to its next task. For this case, you must disable the write cache. To disable the write cache, select disable from the array's Write Cache State selection. The default for Write Cache State is enable. Confirm array configuration Select the OK button to confirm creating the array or Cancel to reject it. The array is not actually created and no data will be overwritten until you have finished making all your changes and select the F8 key. For RAID 5 Arrays Because of the Read-Modify-Write operations, zeros are first written to all drives in the array before the array is functional. The screen shown in Figure 12 appears after selecting OK to confirm array creation. If the write-zeros operation is aborted by the user for any reason the unit will go into initializing mode when restarted. This mode scans the entire array to verify parity. If coherency problems appear the parity will be corrected to match the data found on that stripe. Caution: When running in initializing mode the array is not redundant. You cannot remove any drive. For RAID 1 or 10 Arrays Drives are dynamically profiled, specifically for your brand of drive, after selecting OK to confirm array creation. This is done to customize the stripe size (for RAID configurations offering variable striping) and seek algorithms. www.3ware.com 33

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3ware Disk Array Configuration Utility
www.3ware.com
33
There may be instances when you always want the computer to wait
for the drive to write all the data to disk before going on to its next
task. For this case, you must disable the write cache. To disable the
write cache, select
disable
from the array’s
Write Cache State
selection. The default for
Write Cache State
is
enable.
Confirm array configuration
Select the
OK
button to confirm creating the array or
Cancel
to
reject it. The array is not actually created and no data will be over-
written until you have finished making all your changes and select
the
F8
key.
For RAID 5 Arrays
Because of the Read-Modify-Write operations, zeros are first writ-
ten to all drives in the array before the array is functional. The
screen shown in Figure 12 appears after selecting
OK
to confirm
array creation.
If the write-zeros operation is aborted by the user for any reason the
unit will go into initializing mode when restarted. This mode scans
the entire array to verify parity. If coherency problems appear the
parity will be corrected to match the data found on that stripe.
Caution:
When running in initializing mode the array
is not redundant. You cannot remove any drive
.
For RAID 1 or 10 Arrays
Drives are dynamically profiled, specifically for your brand of
drive, after selecting
OK
to confirm array creation. This is done to
customize the stripe size (for RAID configurations offering variable
striping) and seek algorithms.