Setting Overwrite ECC (Continue on Source Error When Rebuilding)

The Overwrite ECC (Continue on Source Error When Rebuilding) policy is available for units which are redundant. (For units which are not redundant, this option is not shown on the screen.) When this policy is set, ECC (Error Correcting Code) errors are ignored when they are encountered during a rebuild. (ECC errors are typically defects that have been detected in the drive since initialization.) When this policy is not set, if a unit is rebuilding, the rebuild will abort when it encounters an ECC error and the unit will be set back to Degraded.

Since enabling this policy could result in the loss of some source data in the event of source errors, the default is to not enable this policy. Select this option only if you want to ensure that a rebuild will complete successfully without manual intervention. If the rebuild fails and Overwrite ECC (Continue on Source Error When Rebuilding) is not selected, then you have the option to start another rebuild manually. After completing a rebuild with this policy enabled, it is recommended that you execute a file system check when the rebuild completes.

Under FreeBSD use the fsck command.

Under Linux use the fsck command.

Under Mac OS X, you can use the First Aid tab in the Disk Utility—select the disk on the left and then click Verify Disk. If verification encounters problems, you can then use the Repair Disk option on the same screen.

Under OpenSolaris you should follow your operating system’s guide to perform a file system check.

Under VMware you should follow your operating system’s guide to perform a file system check.

Under Windows, you can do this by right-clicking on the Drive and choosing Properties; then on the Tools tab, click Check Now.

To set the Overwrite ECC policy in 3DM2

1	Choose Management >> Controller Settings from the menu bar in 3DM2.

2	In the Unit Policies section of the Controller Settings page, check the boxes to select the policies you want to be in effect for each unit

The page refreshes, and a message at the top confirms the change you have made.

Related Topics: Enabling and Disabling the Unit Write Cache; Working with Read Cache Settings; Enabling or Disabling Auto-Verify for a Unit; Enabling and Disabling Queuing for a Unit; Setting the StorSave Profile for a Unit; Rapid RAID Recovery