Additional details about the drive’s most recent exchange. This section appears only for StorageTek enterprise drives, such as 9840D or T10000C.
Attribute
Definition
Exchange FSC
Four-byte hexadecimal fault symptom code (FSC). For example, FD55, S053, etc. Reported only if an error occurred during the exchange.
Exchange Write Inefficient
Indicates whether the drive failed to meet the write efficiency standard for the drive type. Available only for StorageTek T10000A and above and IBM LTO3 and above drives. Possible values: Yes or No.
Exchange Read Marginal
Indicates whether the drive met the read margin standard for the drive type. Available only for StorageTek T10000A and above drives. Possible values: Yes or No.
Exchange Write Efficiency
Write efficiency for the exchange, based on capacity over distance. A high value is desirable.
Exchange Read Margin
Amount of error correction code (ECC) read margin remaining on the media, as reported by the drive during the last mount. Reported as a percentage. A high value is desirable.
If STA determines that this value has gone below a threshold for this drive type, the Exchange Read Marginal attribute is set to Yes.
Time Spent Reading
Total time the drive spent reading data during the exchange
Time Spent Writing
Total time the drive spent writing data during the exchange
Time Spent Reading or Writing
Total time the drive spent reading and writing data during the exchange
Read MB/sec
Read rate for the time spent actively reading; idle time is excluded. Expressed in megabytes per second. Calculated as:
compressed MB read / total read time
Write MB/sec
Write rate for the time spent actively writing; idle time is excluded. Expressed in megabytes per second. Calculated as:
compressed MB written / total write time
R/W MB/sec
Throughput rate for the time spent actively reading and writing; idle time is excluded. Expressed in megabytes per second. Calculated as:
(compressed MB read + compressed MB written) / (read time + write time)
Read Mount Ratio
Ratio of read time to total mount time. Calculated as:
read time / total mount time
Write Mount Ratio
Ratio of write time to total mount time. Calculated as:
write time / total mount time
R/W Mount Ratio
Ratio of read and write time to total mount time. Displayed as a percentage. A value close to 1.0 indicates the drive is active over the entire mount. Calculated as:
(read time + write time) / total mount time
Exchange Encryption Used
Encryption method used by the drive for the exchange. Available for StorageTek enterprise drives only. Possible values: