Stand-Alone Vs RAID Hard Disk Usage Considerations
It is best for TLER to be "Enabled" when in a RAID array to prevent the recovery time from a disk read or write error from exceeding the RAID controller's timeout threshold. If a drive times out, the hard disk will need to be manually re-added to the array, requiring a re-build and re-synchronization of the hard disk. Enabling TLER seeks to prevent this by interrupting error correction before timeout, to report failures only for data segments. The result is increased reliability in a RAID array.
In a stand-alone configuration TLER should be disabled. As the drive is not redundant, reporting segments as failed will only increase manual intervention. Without a RAID controller to drop the disk, normal (no TLER) recovery ability is most stable.
| Model | TLER Default ( Read / Write ) | Stand-Alone Recommendation | RAID Recommendation |
|---|---|---|---|
| Caviar, SE, SE16, GP, Raptor | Disabled ( 0s / 0s ) | Default | Enabled |
| Caviar RE2, RE2-GP | Enabled ( 7s / 0s ) | Disabled | Default |
Read more about this topic: Error Recovery Control
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