PowerFlex: How to Interpret Unresolved Read or Compare Errors in query_sds and query_sds_device_info

Log in to the Primary MDM and run the query_sds or query_sds_device_info command to retrieve details on Read or Compare errors. For example:

# scli --query_sds --sds_name SDS01
...
5: Name: /dev/sdb Path: /dev/sdb Original-path: /dev/sdb ID: 79be5ad200110008
Storage Pool: SP1, Capacity: 3576 GB, State: Normal
Scanned 6079257 MB, Unresolved Read errors: 0/5, Unresolved Compare errors: 0/0


# scli --query_sds_device_info --sds_name SDS01 --device_id 79be5ad200110008
Device ID: 79be5ad200110008 Name: /dev/sdb Path: /dev/sdb
...
Background Device Scanner Information:
Scanned: 6079323 MB
Unresolved Read Errors: 0/5
Unresolved Compare Errors: 0/0

• Unresolved Read Errors: X/Y

X: The number of unresolved read error - This is calculated as TotalReadErrors - FixedReadErrors, representing how many read errors remain after attempts to resolve them.
Y: The total number of read errors identified during the scan TotalReadErrors.

For example, if the output shows 0/5, it means:

• 5 total read errors were detected during the background scan.
• 0 unresolved errors remain, indicating that all 5 errors were successfully fixed.

If unresolved errors exist, the first number reflects this. For instance, 2/5 would mean:

• 5 read errors were found in total, and 2 read errors remain unresolved after attempting to fix them.

• Unresolved Compare Errors: X/Y

X: The number of unresolved compare errors -  This is calculated as TotalCompareErrors - FixedCompareErrors, indicating how many comparison mismatches remain unresolved.
Y: The total number of compared errors (TotalCompareErrors) found during the scan.

For example, if the output shows 1/3, it means:

• 3 total compare errors were detected.
• 1 unresolved compare error remains, meaning one comparison mismatch is unresolved.

This information is useful for monitoring errors detected by the BackGround device Scanner (BGS), such as read or comparison mismatches, ensuring that they are properly addressed. If unresolved errors persist, it may indicate an ongoing issue that requires further investigation or corrective action.