Due to an external unavoidable situation*, I need to have more than 32k directories in a directory (but as far as I can tell, less than 64k). I'm hitting the limit of ext3. I presume the original server was running ReiserFS. The backup is stored in S3.
My solution is upgrading to ext4, which according to Wikipedia:
In ext3 a directory can have at most 32,000 subdirectories. In ext4 this limit increased to 64,000.
My question is: will mounting the fs as ext4 automatically increase this limit? will I have to run some command to enable new features? do I have to re-create the directory?
* restoring a backup to convert the information to a new and better system we wrote