Sandon,

Thanks for the response :-) I'm guessing the volume size is the problem here 
because I think my journals stopped working when I switched from 1 to 1.5 TB
drives (12T -> 18T volumes). 

> The 8 hour fsck amazes me though, how many inodes are you running on that 
> thing?

Here are the stats for the volume where fsck took 8h 37m...

Filesystem    Inodes         IUsed       IFree          IUse% 
/dev/md12     4,294,967,295  11,520,071  4,283,447,224  1% 

> My fsck takes only ~10 minutes with 6 mililion inodes (I think the inode count
> effects it the most).

Either you're getting better disk performance than I am or some other factor 
effects 
fsck run time.. How many files do you have? The volume that took 8+ hours has: 

19027657792 kilobytes total disk space.
  5601979 kilobytes in 513655 directories.
14702061342 kilobytes in 11006413 user files.
        0 kilobytes in extended attributes
        0 kilobytes in access control lists
 14181225 kilobytes reserved for system use.
4317017204 kilobytes are available for use.

> PS: multi-petabyte data farm? JFS? software raid? backblaze?

Yep, that's us :-)

Tim
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