Re: Partition size discrepancy df v parted/cfdisk
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?
Regards
Clive
--
http://www.clivemenzies.co.uk
strategies for business
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