Seagate Savvio 10K Manual download pdf (Page 22)

16 Savvio 10K.2 SAS Product Manual, Rev. E

6.2.4 S.M.A.R.T.

S.M.A.R.T. is an acronym for Self-Monitoring Analysis and Reporting Technology. This technology is intended

to recognize conditions that indicate imminent drive failure and is designed to provide sufficient warning of a

failure to allow you to back up the data before an actual failure occurs.

Note. The drive’s firmware monitors specific attributes for degradation over time but can’t predict instanta-

neous drive failures.

Each monitored attribute has been selected to monitor a specific set of failure conditions in the operating per-

formance of the drive and the thresholds are optimized to minimize “false” and “failed” predictions.

Controlling S.M.A.R.T.

The operating mode of S.M.A.R.T. is controlled by the DEXCPT and PERF bits on the Informational Exceptions

Control mode page (1Ch). Use the DEXCPT bit to enable or disable the S.M.A.R.T. feature. Setting the DEX-

CPT bit disables all S.M.A.R.T. functions. When enabled, S.M.A.R.T. collects on-line data as the drive performs

normal read and write operations. When the PERF bit is set, the drive is considered to be in “On-line Mode

Only” and will not perform off-line functions.

You can measure off-line attributes and force the drive to save the data by using the Rezero Unit command.

Forcing S.M.A.R.T. resets the timer so that the next scheduled interrupt is in two hours.

You can interrogate the drive through the host to determine the time remaining before the next scheduled mea-

surement and data logging process occurs. To accomplish this, issue a Log Sense command to log page 0x3E.

This allows you to control when S.M.A.R.T. interruptions occur. Forcing S.M.A.R.T. with the RTZ command

resets the timer.

Performance impact

S.M.A.R.T. attribute data is saved to the disk so that the events that caused a predictive failure can be recre-

ated. The drive measures and saves parameters once every two hours subject to an idle period on the drive

interfaces. The process of measuring off-line attribute data and saving data to the disk is uninterruptable. The

maximum on-line only processing delay is summarized below:

Maximum processing delay

On-line only delay

DEXCPT = 0, PERF = 1

Fully-enabled delay

DEXCPT = 0, PERF = 0

S.M.A.R.T. delay times

220ms

455ms

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 75 76

No comments

Seagate Savvio 10K Manual Page 22