Description

For SRX1500, sometimes a lot of lost+found/ is created in "show system core-dump" even there is no file in this directory.

root> show system core-dumps
/var/tmp/*core*: No such file or directory
/var/tmp/pics/*core*: No such file or directory
/var/crash/kernel.*: No such file or directory
/var/jails/rest-api/tmp/*core*: No such file or directory
/tftpboot/corefiles/*core*: No such file or directory

/var/crash/corefiles:
total blocks: 44
drwx------ 2 root wheel 16384 Aug 24 18:26 lost+found/
total files: 0


Run the following command to confirm if any files are under "lost+found": 
root@% cd lost+found/
root@% ls -la
total 40
drwx------ 2 root wheel 16384 Apr 15 06:19 .
drwxr-xr-x 3 root wheel 4096 Apr 15 06:19 .. <<<<< no files under lost+found directory

Solution

The bootup process may run fsck to check if there is corruption on the disk.  The fsck will create this lost+found directory. If fsck discovers corruption or orphan blocks, it will be saved in this folder.
 

Having lost+found directory is not an issue when it is an empty folder. An empty folder indicates that no corruption or orphan block has been found in the last fsck. However, if you see files listed under the lost+found directory, please contact your technical service representative for further assistance.