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Re: Partition size discrepancy df v parted/cfdisk



On Thu, 22 Jan 2004 23:57:44 +0000, Clive Menzies wrote:

> On (22/01/04 14:31), Paul Morgan wrote:
>> On Thu, 22 Jan 2004 15:05:01 +0000, Clive Menzies wrote:
>> > I've just reorganised the partitions on a second (Seagate) drive in
>> > a dual booting Dell Dimension XPS T500 to give more room to /usr 
>> > (to upgrade from woody to sid).
>> > 
>> > The partitions I messed with were /home, /usr and two swap.
>> > 
>> > /home was 35 Gb and /usr 1Gb 
>> > 
>> > Using parted I deleted home and created a new 5GB /usr partition and 
>> > 30Gb /home.  Once I'd amended fstab and copied the /usr file across, 
>> > I deleted the old /usr and one swap partition to create a new bigger 
>> > swap partition and increased the remaining swap partition.  All worked 
>> > fine and I've subsequently upgraded to sid and everything is back as 
>> > it should be.
>> > 
>> > However, df -h gives (showing /usr as 1Gb):
>> > 
>> > /dev/hdb2              92M   41M   47M  47% /
>> > /dev/hdb9             958M  564M  346M  63% /usr
>> > /dev/hdb6             958M  147M  763M  17% /var
>> > /dev/hdb7             958M   80K  909M   1% /tmp
>> > /dev/hdb10             29G   32M   28G   1% /home
>> > tmpfs                 252M     0  252M   0% /dev/shm
>> > 
>> > whereas parted shows /usr (9) as about 5Gb:
>> > 
>> > 2          0.031     94.130  primary   ext2
>> > 1         94.131  76316.594  extended              lba
>> > 5         94.162    651.071  logical   linux-swap
>> > 11       651.103   1427.651  logical   linux-swap
>> > 6       1427.682   2400.336  logical   ext2
>> > 7       2400.368   3373.022  logical   ext2
>> > 9       3373.053   8424.711  logical   ext2
>> > 10      8424.743  38421.079  logical   ext2
>> > 8      38421.110  76316.594  logical   fat32
>> > 
>> > and cfdisk also shows 5GB:
>> > 
>> > hdb2         Primary   Linux ext2    	98.71
>> > hdb5         Logical   Linux swap	584.00
>> > hdb11        Logical   Linux swap	814.31
>> > hdb6         Logical   Linux ext2	1019.94
>> > hdb7         Logical   Linux ext2	1019.94
>> > hdb9         Logical   Linux ext2	5297.09
>> > hdb10        Logical   Linux ext2    	31453.48
>> > hdb8         Logical   W95   FAT32      39736.33
>> > 
>> > Any ideas?
>> > 
>> 
>> fsdisk and parted are showing the partiton size, whereas df is showing the
>> *filesystem* size.  You don't say how you "copied the /usr file across",
>> but what you should have done is:
>> 
>> Use mke2fs to create the filesystem on /dev/hdb9, e.g.:
>> 
>> mke2fs /dev/hdb9
>> 
>> Then you should have mounted the new filesystem, used cp to copy the
>> current /usr to it, then changed /etc/fstab to reflect the new /usr and
>> rebooted, or umounted the old /usr and mounted the new one, e.g.:
>> 
>> mkdir /tmp/usr (or /mnt/usr if you prefer)
>> mount /dev/hdb9 /tmp/usr
>> cp -ax /usr /tmp
>> umount /tmp/usr
>> umount /usr
>> mount /dev/hdb9 /usr
>>  <change the /etc/fstab also>
>> 
>> It seems that you probably didn't do that, and somehow copied the old
>> filesystem as a whole onto the new partition (keeping the old filesystem's
>> size and wasting all the rest of the partition).  Check out ext2resize man
>> page to fix.
> Brilliant! ;) Thanks Paul for a great explanation.  I used rsync -opg to copy
> the /usr files across <thinks> must read man pages prior to significant
> tasks</thinks>
> 
> Tomorrow, I will dutifully read ext2resize man page and fix it.   Reading the 
> parted user manual suggests that "parted resize" could also be used to fix it?
> 
> Thanks again ;)
> 
> I presume you're across the pond - do you get to vote?
> 

Clive,

Just "ext2resize /dev/hdb9" should do the trick.

Yes, I'm a Welsh expat living in Kissimmee, Florida.  And no, I don't get
to vote:  I'm still a British citizen, a permanent resident alien.  My
wife, however, is a Kentucky girl, so she votes for the both of us, so to
speak :)

-- 
....................paul

It is important to realize that any lock can be picked with a big
enough hammer.
               -- Sun System & Network Admin manual




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