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ext4

-                      v3
+                      v4
  > Note that lazy_itable_init is turned on by default if the kernel you are running supports automatic background initialization of the inode table ( 2.6.37+ ). Without that support, enabling this option is unsafe as it leaves the inode tables uninitialized, so they may contain garbage that fsck will mistake as valid inodes under certain circumstances. Also uninit_bg is enabled by default for ext4.
+ = Very long mount times of large ext4 filesystems - 12.04.1 LTS =
+ * TB級のext4をマウントしようとすると、数分以上待たされる
+ * [http://ubuntuforums.org/showthread.php?p=12257819 (64 bit) Very long mount times of large ext4 filesystems - 12.04.1 LTS - Ubuntu Forums]
+ * [https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054605 Bug #1054605 “Mount very slow for 22TB ext4 filesystem on Ubuntu...” : Bugs : “linux” package : Ubuntu]
+ > ext4: fix long mount times on very big file systems
+ >
+ > This commit was applied in v3.6-rc3.
+ >
+ > After further investigation, it seems that a fix may already exist in v3.2.29: