Promise Technology VTRAK M210i, Product Manual

Page: 287 / 318

Chapter 8: Troubleshooting
273
Physical Drive Problems
Physical Drive Offline
Check the drive for:
•
PFA Condition – Caused by a bad block or sector.
See “Clearing Stale and PFA Conditions” on page 102.
• Stale Configuration – Caused by obsolete array information on the physical
drive. Identify the disk array to which the physical drive belongs. Then delete
the disk array. See “Deleting a Disk Array” on page 109 or page 151.
If the error condition remains on the physical drive, clear the error condition.
See “Clearing Stale and PFA Conditions” on page 102 or page 145.
Physical Drive Failed
When physical drive status shows failed , the physical drive cannot be repaired.
You must replace the failed drive.
Physical Drive Fails during Migration
VTrak has two methods for migrating a disk array:
• DDF – The default setting. Slower but reliable
• NVRAM – An optional setting that requires special access. Faster but risks
data loss
Normally, RAID level migration is done under the default Disk Data Format (DDF)
setting. If a physical drive or the controller fails during migration, the disk array
goes critical, and you can rebuild it. Migration under DDF can take up to several
hours depending on the number and size of the physical drives and data input/
output activity.
You can set the VTrak to migrate disk arrays under Non-Volatile Random Access
Memory (NVRAM), a much faster process because it writes data to the memory
in the controller. However, if a physical drive or the controller fails during
migration, the logical drives will go offline and you will lose data. See “Incomplete
Array” on page 272.
Because the setting for migration under NVRAM requires special access, most
users will not encounter this condition.
Physical Drive Fails during Transport
Transport is the action of moving the physical drives of a disk array:
• To different slots in the same VTrak enclosure
• From one VTrak enclosure to another