Disks - Latest Probe window

The Latest Probe tab on the Disks window shows the information about this disk that was collected by the most recent probe of that disk.

Note: Some of this information is not applicable for IBM SAN Volume Controller clusters or ESS subsystems, and will be displayed as N/A.

Field Name

Description

Sector Size

size of the sectors on a disk

Sectors per Average Track

average number of sectors per track across an entire disk

Sectors per Outer Track

average number of sectors for Outer tracks on a disk

Sectors per Inner Track

average number of sectors for Inner tracks on a disk

Heads

number of heads on the disk

Cylinders

number of cylinders on the disk

Logical Block Size

same as Sector Size

Capacity

amount of storage space allocated to disk

RPM

speed that the disk turns (revolutions per minute)

Elapsed Time Powered On

amount of time since the disk was powered on

Spare Blocks

blocks reserved for copying data from defective blocks

Write Protection

indicates whether write protection is enabled for a disk

Cache Enabled

NONE, READ, WRITE, READ + WRITE

  • NONE. Write does not complete until data is written to medium; read must access medium

  • READ. Read may avoid medium access; write does not complete until data is written to medium

  • WRITE. Write may complete without data being written to medium; read must access medium.

  • READ + WRITE. Read may avoid medium access; write may complete without data being written to medium.  

Failure Predicted

indicates whether a failure is predicted for a disk

Probe Last Run

date/time when the last probe was run against the disk

Unallocated Space

amount of unused space on a disk

Primary Defects

number of defects on the disk when it was new

Grown Defects

number of defects on the disk after the it has been used

NonMedium Errors

An error not related to the physical disk platter, such as mechanical problem in the head movement, communication errors, etc.

Temperature

temperature (in degrees) of the disk (in Celsius)

Recovered Errors

read or write error which succeeded on a subsequent attempt

Unrecovered Errors

read or write error which disk could not overcome

Bytes

total number of bytes transferred since format or manufacture of a disk

Automatic Write Reallocation

If ON, disk attempts to write to another part of disk surface when disk defect is found. If OFF, unrecovered error occurs when defect is found.

Automatic Read Reallocation

If ON, recovered read error causes data to remap (to different parts of the medium). If OFF, no remapping occurs on (recovered) read errors.

Read Continuous (no error correction)

If ON, device may fabricate data. If OFF, device must try to reread and must report error upon failure.

 

For more information, see Asset Reporting - By Storage Subsystem.