SimpleTech ZeusIOPS Manual descargar pdf (Pagina 63)

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3.5-Inch Fibre Channel Solid State Drive 61

READ ERROR CORRECTION BITS AND COUNT

When blocks are read from the flash, the ECC engine will report which commands were completed

with the aid of ECC correction. The drive will maintain a running count. When this count changes, a

percentage is calculated to provide a rate at which these errors are being generated. The rate is

related to the number of flash Read commands that were issued. The drive also maintains a threshold

value and uses it to report events to the host. To avoid reporting issues with bursts of errors, the

counts will be maintained to reflect what event(s) occurred during the last five (5) minutes of

operation.

WRITE, ERASE AND READ ERROR RATE

The drive will maintain a simple count of when the Write, Erase and Read commands fail. It also

maintains a percentage or rate of failure in relation to the flash Write, Erase or Read commands

issued and compares it against threshold values when the value increases. To avoid reporting issues

with bursts of errors, the counts are maintained to reflect what events occurred during the last five (5)

minutes of operation.

TEMPERATURE

The drives are able to read and check the temperature against a threshold. Drives report the

temperature as defined by the SCSI specification.

EVENT TESTING

The host software can select a TEST mode to check the reporting methods. When this mode is set,

the drive will generate TEST notifications using the selected reporting methods.

DIAGNOSTICS

While not directly related, there are some SMART request and reporting features for drive

diagnostics. These reporting features involve the host requesting that the drive perform either a short

or extended diagnostic. Typically, these are initiated as background tasks that perform media checks.

These media checks verify small or large media areas. The drive is required to hold the information

for the last twenty (20) test, including the completion status. The recorded information is then made

available to the host.

Note: This feature is not supported.

SCSI IMPLEMENTATION

For SCSI, Fibre Channel and SAS connections, there are two topics related to SMART. The first is

implemented using the LOG SENSE and LOG SELECT commands and associated pages. While the

specification for these commands permit the configuration and reporting of threshold parameters,

these features are not supported and are used only to obtain the current counts or readings. As an

alternative, the MODE SENSE and MODE SELECT commands and associated pages specifically

address threshold settings and reporting methods.

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SimpleTech ZeusIOPS Manual Pagina 63