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After converting to a dm-crypt volume I seem to be missing almost 20Gb from my free space.
I've recently replaced the HDD in my laptop due to a failure of the old one so I've started from scratch. I installed without encryption a week ago, then yesterday I backed up all my data and reinstalled using an encrypted /home
It is set up as dm-crypt LUKS with no LVM. My HDD is partitioned as logical partitions as follows:
sda5: /boot
sda6: /
sda7: /home (dm-crypt) - mapped from /dev/mapper/sda7crypt - formatted to ext4
sda8: SWAP
so here's what df -h shows:
Filesystem Size Used Avail Use% Mounted on
udev 10M 228K 9.8M 3% /dev
/dev/sda6 12G 5.4G 5.7G 49% /
shm 1.9G 0 1.9G 0% /dev/shm
/dev/sdb1 116M 1.6M 108M 2% /mnt/keys
/dev/mapper/sda7crypt 378G 29G 330G 9% /home
/dev/sda5 194M 34M 151M 19% /boot
my question is: is that normal? if not, where did it go?
Last edited by speed145a (2010-12-08 22:02:27)
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Do I need to provide more information?
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The only explanation that makes sense is reversed blocks. It's the filesystem that's keeping 5% of the available space only to be used by root and doesn't have anything to do with LUKS.
Here's a post discussing the situation in more detail. Instead of '-m 1', use '-m 0'; no point in reserving space in non-critical partitions like one that houses /home.
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Thank you so much! Here is the result for those who care.
[jonathan@temple ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/sda7crypt
378G 30G 330G 9% /home
[root@temple jonathan]# tune2fs -m 0 /dev/mapper/sda7crypt
tune2fs 1.41.12 (17-May-2010)
Setting reserved blocks percentage to 0% (0 blocks)
[root@temple jonathan]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/sda7crypt
378G 30G 349G 8% /home
*speed145a skipps along along his merry way with an extra 19 GB of space
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