Avago Technologies Syncro CS 9286-8e - Manual (Page 69)

Avago Technologies
- 69 -
Syncro CS 9286-8e Solution User Guide
November 2014 Chapter 4: System Administration
Performing Preventive Measures on Disk Drives and VDs
4.5 Performing Preventive Measures on Disk Drives and VDs
The following drive and VD-level operations help to proactively detect disk drive and VD errors that could potentially
cause the failure of a controller node. For more information about these operations, refer to the MegaRAID SAS
Software User Guide.
 Patrol Read – A patrol read periodically verifies all sectors of disk drives that are connected to a controller,
including the system reserved area in the RAID configured drives. You can run a patrol read for all RAID levels and
for all hot spare drives. A patrol read is initiated only when the controller is idle for a defined time period and has
no other background activities.
 Consistency Check – You should periodically run a consistency check on fault-tolerant VDs (RAID 1, RAID 5,
RAID 6, RAID 10, RAID 50, and RAID 60 configurations; RAID 0 does not provide data redundancy). A consistency
check scans the VDs to determine whether the data has become corrupted and needs to be restored.
For example, in a VD with parity, a consistency check computes the data on one drive and compares the results to
the contents of the parity drive. You must run a consistency check if you suspect that the data on the VD might
be corrupted.
NOTE Be sure to back up the data before running a consistency check if you
think the data might be corrupted.