man tune2fs
-r reserved-blocks-count
Set the number of reserved filesystem blocks.
be careful with filesystem reserved block, one time i had a production
server with / corrupted
Thanks
2013/2/14 Mitchell Laks <ml...@post.harvard.edu>
>
> Hi I am trying to backup a volume which has size 347G. So I thought to use
> lvm2.
> So I created a volumeby
>
> lvcreate -n test --size 348G my-volume
>
> I thought I would be giving myself an extra Gigabyte there :).
>
> then i did
> mkfs.ext3 -m0 /dev/my-volume/test
>
> then when I mounted the device
> mount /dev/my-volume/test /mnt
>
> then df -h
> only shows 343G instead of 348G.
>
> Note that tune2fs shows that I have indeed have 0 reserved blocks
> (ie mkfs.ext3 -mo /dev/my-volume/test is equivalent to tune2fs -m0
> /dev/my-volume/test
>
> So my question is where have those extra 5G gone to?
>
> I need to back up a 347.
>
> So I had tp set it up with 353G to have the correct size.
>
> Can anyone explain this to me?
> What kind of formula to use to calculate how much space I will need in
> advance for creating the ext3 or in the future ext4 file system? 5G seems
> like a lot.
>
> Thanks,
> Mitchell Laks
>
>
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