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Fixing Volume Bitmap is incorrect error?


Go to solution Solved by Christopher (Drashna),

Question

So I woke up this morning to some alerts from Scanner that 2 of my drives had filesystem issues (both drives are in a pool).
 
Running the link to fix the drive within the Scanner fixed one drive right away but my 8TB drive failed and asked me to run chkdsk manually. I assigned the drive a letter and chkdsk reported the following:
 
Stage 3: Examining security descriptors ...
Security descriptor verification completed.
  11604 data files processed.
The Volume Bitmap is incorrect.
Windows has checked the file system and found problems.

Running it with the /scan switch found no issues but running it without it did. Here is the full output of both commands run back to back:

PS C:\Users\Administrator> chkdsk.exe g: /scan
The type of the file system is NTFS.

Stage 1: Examining basic file system structure ...
  208384 file records processed.
File verification completed.
  6400 large file records processed.
  0 bad file records processed.

Stage 2: Examining file name linkage ...
  231592 index entries processed.
Index verification completed.
  0 unindexed files scanned.
  0 unindexed files recovered to lost and found.

Stage 3: Examining security descriptors ...
Security descriptor verification completed.
  11604 data files processed.

Windows has scanned the file system and found no problems.
No further action is required.

   7630883 MB total disk space.
   5479076 MB in 188976 files.
     77960 KB in 11606 indexes.
         0 KB in bad sectors.
    513531 KB in use by the system.
     65536 KB occupied by the log file.
   2151229 MB available on disk.

      4096 bytes in each allocation unit.
1953506303 total allocation units on disk.
 550714792 allocation units available on disk.

PS C:\Users\Administrator> chkdsk.exe g:
The type of the file system is NTFS.

WARNING!  /F parameter not specified.
Running CHKDSK in read-only mode.

Stage 1: Examining basic file system structure ...
  208384 file records processed.
File verification completed.
  6400 large file records processed.
  0 bad file records processed.

Stage 2: Examining file name linkage ...
  231592 index entries processed.
Index verification completed.
  0 unindexed files scanned.
  0 unindexed files recovered to lost and found.

Stage 3: Examining security descriptors ...
Security descriptor verification completed.
  11604 data files processed.
The Volume Bitmap is incorrect.
Windows has checked the file system and found problems.
Please run chkdsk /scan to find the problems and queue them for repair.

   7630883 MB total disk space.
   5479076 MB in 188976 files.
     77960 KB in 11606 indexes.
         0 KB in bad sectors.
    513531 KB in use by the system.
     65536 KB occupied by the log file.
   2151229 MB available on disk.

      4096 bytes in each allocation unit.
1953506303 total allocation units on disk.
 550714792 allocation units available on disk.

Is this an issue and if so, can it be safely fixed or am I looking at a drive replacement? 

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Do NOT run it with "/scan".

 

While, this option is pretty awesome, it skips a number of checks, include the Volume Bitmap.  You need to run this offline only, meaning without the "/scan" flag. 

 

This is an issue that I ran into myself and it tricked me.  (as well as Alex initially).

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I will let Chris explain the chkdsk options and what they do - as some are more comprehensive than others

 

if not done already check the smart values for both disks - although its not showing bad sectors at the moment - it may not have picked them up yet or the disk has remapped them already - hence the smart check

 

What was the error on the other disk?

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I will let Chris explain the chkdsk options and what they do - as some are more comprehensive than others

 

if not done already check the smart values for both disks - although its not showing bad sectors at the moment - it may not have picked them up yet or the disk has remapped them already - hence the smart check

 

What was the error on the other disk?

 

 

The SMART values appear fine and both drives show no imminent failures expected.

 

The other disk had the same kind of error in Scanner but was fixed with whatever operation ran when I clicked to fix the issue in Scanner (I assume chkdsk).

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OK, I'm not sure what the deal is but now a third 3TB drive has come up with the same error. I can understand 2 disks having the same issue at the same time but 3 out of 4 pool members seems a bit....unlikely.

 

There has been nothing recently done on this server outside of upgrading from 2012 R2 to 2016. I believe this is the first time the drives got scanned since the 2016 upgrade so could that have something to do with these results?

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Do NOT run it with "/scan".

 

While, this option is pretty awesome, it skips a number of checks, include the Volume Bitmap.  You need to run this offline only, meaning without the "/scan" flag. 

 

This is an issue that I ran into myself and it tricked me.  (as well as Alex initially).

 

So running it with /scan didn't find anything and your explanation that it skips the volume bitmap part seems a good explanation as to why it didn't find anything bad.

 

Now running chkdsk /F then running another chkdsk to verify no other issues are found is the correct approach, right?

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So running it with /scan didn't find anything and your explanation that it skips the volume bitmap part seems a good explanation as to why it didn't find anything bad.

 

Now running chkdsk /F then running another chkdsk to verify no other issues are found is the correct approach, right?

 

Yes, basically. 

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