3Ware 9550SXU-8LP User Guide - Page 136

Disabling Write Cache on Unit Degrade

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Chapter 7. Configuring Your Controller Disabling Write Cache on Unit Degrade Note: This procedure applies only to 9500S controllers. For 9550SX and 9590SE controllers, this feature is integrated into the StorSave Profile. You can choose whether you want the write cache to be automatically disabled when a unit degrades. This enables some higher level recovery, to cover the case where there is a software RAID layer (using some redundancy) on top of the 3ware RAID configuration. In case of a second drive failure, the software RAID layer can still provide redundancy since no data was lost. When this setting is set to Yes, it overrides the write cache setting specified for a particular unit. You can change this setting in 3BM or using the CLI. For more information about enabling and disabling the write cache, see"Enabling and Disabling the Unit Write Cache" on page 143. To disable write cache when a unit degrades 1 At the main 3BM screen, Tab to Policy and press Enter. 2 On the Policy Control screen, Tab to Disable Write Cache on Unit Degrade. 3 Press Enter to display the choices, use the arrow keys to select Yes, and press Enter again to select it. 4 Tab to the OK button and press Enter. You will notice a short delay as 3BM makes the policy changes. 126 3ware Serial ATA RAID Controller User Guide

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Chapter 7. Configuring Your Controller
126
3ware Serial ATA RAID Controller User Guide
Disabling Write Cache on Unit Degrade
Note:
This procedure applies only to 9500S controllers. For
9550SX and 9590SE controllers, this feature is integrated into the
StorSave Profile.
You can choose whether you want the write cache to be automatically
disabled when a unit degrades. This enables some higher level recovery, to
cover the case where there is a software RAID layer (using some redundancy)
on top of the 3ware RAID configuration. In case of a second drive failure, the
software RAID layer can still provide redundancy since no data was lost.
When this setting is set to
Yes
,
it overrides the write cache setting specified
for a particular unit. You can change this setting in 3BM or using the CLI.
For more information about enabling and disabling the write cache,
see“Enabling and Disabling the Unit Write Cache” on page 143.
To disable write cache when a unit degrades
1
At the main 3BM screen,
Tab
to
Policy
and press
Enter
.
2
On the Policy
Control
screen,
Tab
to
Disable Write Cache on Unit
Degrade
.
3
Press
Enter
to display the choices, use the
arrow keys
to select
Yes
, and
press
Enter
again to select it.
4
Tab
to the
OK
button and press
Enter
.
You will notice a short delay as 3BM makes the policy changes.