Recovering And Clearing Punctured Block Entries; Changing Virtual Drive Properties - Lenovo ThinkServer RD650 User Manual

12Gb/s MegaRAID SAS Software User Guide
March 2014
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.
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
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.
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.
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.
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.
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.
Selecting Virtual Drive Settings.
LSI Corporation
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Chapter 9: Configuration
Recovering and Clearing Punctured Block Entries