SQL Database Will Not Attach After RAID Recovery
When SQL Server rejects database files after RAID recovery, the problem may be inside the database, in the recovered file, or in the array state from which that file was produced. Repeating attach and repair attempts does not identify which one.
Preserve the first recovered files and the original RAID members. Do not keep modifying the only MDF or LDF files to force an attach.
What this condition means
The recovered volume may be correct while database headers, allocation pages, or transaction logs are damaged. It may also be a plausible but incorrect RAID reconstruction that returned inconsistent blocks inside otherwise normal-looking files.
A useful diagnosis compares storage reconstruction, file-level readability, SQL Server errors, and internal database structures instead of treating the attach error as an isolated software problem.
What to record
- Exact SQL Server attach and error-log messages
- Database version, recovery model, file set, sizes, and timestamps
- How the RAID was recovered or rebuilt and which members were used
- All alternate recovered copies, backups, and transaction logs
- Repair, detach, attach, rename, copy, or log-rebuild attempts
What not to do
- Keep attaching and detaching the same files
- Rebuild or delete the log on the only copy
- Run emergency repair before preserving alternatives
- Discard earlier recovered versions
- Assume a mounted filesystem proves the RAID geometry is correct
How ADR evaluates it
ADR first validates the array and file source, then works from protected database copies. That separates storage reconstruction errors from database structural damage.
Candidate results are checked against the tables, dates, records, and application data the client needs—not merely whether SQL Server accepts the attach.
ADR can compare the recovered storage state, alternate file versions, SQL errors, and internal database structures before choosing a repair or extraction path. A successful attach is useful only if the required data is coherent.
What happens next
An attach failure does not establish that the database is lost. The defensible recovery may be a working database, a corrected file set, or extracted priority records.