Comparison between fsck time and inode count in ext4

rdahal · 02-25-2016, 11:06 PM

I need to compare the fsck time taken with respect to the inode count in ext4 and ext3 file systems.
How can I collect data, fsck time taken with respect to the inode count. With this data a comparative study of the file system will be made.

Thanks in advance.

rdahal

cliffordw · 02-26-2016, 02:24 AM

Hi there,

Could you please elaborate on what you are trying to do? What do you want to compare? I doubt that the time it takes to run fsck on a filesystem is particularly useful as a comparison, as it will depend on a lot more than just the inode count. Factors like filesystem size, block count, etc, also play a significant role.

If you want to do this anyway, try something this:

Code:

time fsck /dev/sdXN

Obviously you need to specify the correct device ;-) The output from "fsck" will show the inode count, and the "time" command will tell you how long it took to run.

Sample output:

Code:

$ sudo time fsck /dev/sda2 
fsck from util-linux 2.27.1
e2fsck 1.42.13 (17-May-2015)
/dev/sda2: clean, 13/6111232 files, 431595/24414062 blocks

0.02user 0.00system 0:00.04elapsed 76%CPU (0avgtext+0avgdata 3776maxresident)k
2536inputs+16outputs (0major+595minor)pagefaults 0swaps

The "13/6111232 files" shows the number of inodes used and total, while the "0:00.04elapsed" part is the elapsed time it took to run.

Regards,

Clifford