3.3.1 Monitoring the Status of Hard Disks

You can monitor the status of a hard disk by checking its attributes with the CellCLI LIST PHYSICALDISK command.

For example, a hard disk status equal to failed (the status for failed hard disks was critical in earlier releases), or warning - predictive failure is probably having problems and needs to be replaced. The disk firmware maintains the error counters, and marks a drive with Predictive Failure when internal thresholds are exceeded. The drive, not the cell software, determines if it needs replacement.

• Use the CellCLI command LIST PHSYICALDISK to determine the status of a hard disk:

  CellCLI> LIST PHYSICALDISK WHERE disktype=harddisk AND status!=normal DETAIL
           name:                            8:4
           deviceId:              12
             deviceName:                   /dev/sde
             diskType:                      HardDisk
           enclosureDeviceId:      8
           errOtherCount:          0
           luns:                   0_4
             makeModel:                    "HGST    H7280A520SUN8.0T"
           physicalFirmware:         PD51
           physicalInsertTime:      2016-11-30T21:24:45-08:00
           physicalInterface:     sas
           physicalSerial:            PA9TVR
           physicalSize:               7.153663907200098T
           slotNumber:                  4
           status:                        failed

When disk I/O errors occur, Oracle ASM performs bad extent repair for read errors due to media errors. The disks will stay online, and no alerts are sent. When Oracle ASM gets a read error on a physically-addressed metadata block, it does not have mirroring for the blocks, and takes the disk offline. Oracle ASM then drops the disk using the FORCE option.

The Oracle Exadata Storage Server hard disk statuses are as follows:

• Oracle Exadata System Software release 11.2.3.3 and later:

  • normal
  • normal - dropped for replacement
  • normal - confinedOnline
  • normal - confinedOnline - dropped for replacement
  • not present
  • failed
  • failed - dropped for replacement
  • failed - rejected due to incorrect disk model
  • failed - rejected due to incorrect disk model - dropped for replacement
  • failed - rejected due to wrong slot
  • failed - rejected due to wrong slot - dropped for replacement
  • warning - confinedOnline
  • warning - confinedOnline - dropped for replacement
  • warning - peer failure
  • warning - poor performance
  • warning - poor performance - dropped for replacement
  • warning - poor performance, write-through caching
  • warning - predictive failure, poor performance
  • warning - predictive failure, poor performance - dropped for replacement
  • warning - predictive failure, write-through caching
  • warning - predictive failure
  • warning - predictive failure - dropped for replacement
  • warning - predictive failure, poor performance, write-through caching
  • warning - write-through caching

• Oracle Exadata System Software release 11.2.3.2:

  • normal
  • normal - confinedOnline
  • not present
  • failed
  • failed - rejected due to incorrect disk model
  • failed - rejected due to wrong slot
  • warning - confinedOnline
  • warning - peer failure
  • warning - poor performance
  • warning - poor performance, write-through caching
  • warning - predictive failure, poor performance
  • warning - predictive failure, write-through caching
  • warning - predictive failure
  • warning - predictive failure, poor performance, write-through caching
  • warning - write-through caching

• Oracle Exadata System Software release 11.2.3.1.1 and earlier:

  • normal
  • critical
  • poor performance
  • predictive failure
  • not present