LSI Corporation
- 277 -
12Gb/s MegaRAID SAS Software User Guide
March 2014
Chapter 9: Configuration
Recovering and Clearing Punctured Block Entries
NOTE
The
Drive Standby time
drop-down list is enabled only if any of the
check boxes above it are checked. The drive standby time can be 30
minutes, 1 hour, 1.30 hours, or 2 hours through 24 hours.
6.
Click
OK
.
The Power-Save settings are saved. After you click
OK
, a confirmation dialog appears prompting you to save your
changes.
If you do not specify the Power-Save settings in the
Manage Power Save Settings
dialog, a confirmation dialog
appears. The confirmation dialog mentions that the system does not have power savings for any of the drives,
and asks if you would like to proceed.
9.6
Recovering and Clearing Punctured Block Entries
You can recover and clear the punctured block area of a virtual drive.
ATTENTION
This operation removes any data stored on the physical drives. Back up
the good data on the drives before making any changes to the
configuration.
When a Patrol Read or a Rebuild operation encounters a media error on the source drive, it punctures a block on the
target drive to prevent the use of the data with the invalid parity. Any subsequent read operation to the punctured
block completes but with an error. Consequently, the puncturing of a block prevents any invalid parity generation
later while using this block.
To recover or clear the punctured block area of a virtual drive, run a Slow (or Full) Initialization to zero out and
regenerate new parity causing all bad block entries to be removed from the bad block table.
To run a Slow (or Full) Initialization, see
Selecting Virtual Drive Settings
.
9.7
Changing Virtual Drive Properties
You can change the read policy, write policy, and other virtual drive properties at any time after a virtual drive is
created.
ATTENTION
Do not enable drive caching on a mirrored drive group (RAID 1 or
RAID 1E). If you do, data can be corrupted or lost in the event of a
sudden power loss. A warning appears if you try to enable drive
caching for a mirrored drive group.
NOTE
For virtual drives with SAS drives only, set the drive write cache policy
set to
Disabled
, by default. For virtual drives with SATA drives only, set
the drive write cache policy to
Enabled
, by default.
To change the virtual drive properties, perform the following steps:
1.
Select a virtual drive icon in the
Physical
tab or the
Logical
tab in the left panel of the
MegaRAID Storage
Manager
window.
2.
Select
Go To > Virtual Drive > Set Virtual Drive Properties
from the menu bar.
The
Set Virtual Drive Properties
dialog appears.
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