KIT has a question about lfsck and igif files. We ran into LU-2842 due to a 1.8.x filesystem upgraded to 2.1.x and then 2.4.x. We successfully resolved that issue, but running lfsck on other filesystems led to unexpected results:

I just started "es_lfsck --start"
anyway on a currently not much used file system and was a bit
astonished about the following part of the "es_lfsck --status" output:
checked: 62745
updated: 371
failed: 0
prior_updated: 0
noscrub: 2783
igif: 382
Since the file system has not been created or mounted with Lustre 1.8
I thought that nothing should be updated. Can you explain these numbers?

Basically we are unsure about where the updates and igif files are coming from since this filesystem has always been 2.x, and we were under the impression that igif files were only on 1.8->2.x filesystems.