Product manual

Galaxy G3G12 / G3G16 - Installation and Hardware Reference Manual
276 Section 8 Troubleshooting
8.8 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”
• 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”
• If the error condition remains on the physical drive, clear the error condition. See “Clearing Stale and
PFA Conditions”
Physical Drive Not Usable
This condition occurs when you have:
• Two controllers in your Galaxy3G subsystem and a SATA drive without an AAMUX adapter. See
“AAMUX Adapter” in chapter 2.
• A missing or defective SAS cable between the Galaxy3G subsystem and a JBOD enclosure.
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
Galaxy3G 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 Galaxy3G 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
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 Galaxy3G enclosure
• From one Galaxy3G enclosure to another
If a physical drive fails during a transport, or you do not move all of the physical drives to their new locations,
the Galaxy Array Manager will display an incomplete array.