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Re: Missing Disk Space or Partition

On Thu, Jan 20, 2011 at 05:49:06PM -0500, RR wrote:
> /dev/mapper/DebSparcx64--01-root 256M   78M  166M  32% /
> tmpfs                 2.0G     0  2.0G   0% /lib/init/rw
> udev                   10M  1.1M  9.0M  11% /dev
> tmpfs                 2.0G     0  2.0G   0% /dev/shm
> /dev/mapper/DebSparcx64--01-home  30G  177M   29G   1% /home
> /dev/mapper/DebSparcx64--01-tmp  368M   11M  339M   3% /tmp
> /dev/mapper/DebSparcx64--01-usr  4.6G  372M  4.0G   9% /usr
> /dev/mapper/DebSparcx64--01-var  2.8G  189M  2.5G   8% /var
> The question now is, if you look carefully, I only have ~37GB showing as
> partitioned. Where is the remaining (72-37 GB) space? This was easy to see
> in 'format' command in Solaris but doing all sort of cart-wheels in
> Debian/Linux, I don't know what the heck these dm-* partitions are, which
> seem to be where this missing space is, and how do I get to it to create a
> valid partition out of it and mount it and use it?

Let me guess: you used LVM.  If you did, you can use "vgdisplay -v
DebSparcx64-01" (more generically, "vgdisplay -v name-of-volume-group")
as root to see how much space is allocated and free.  The dm-* devices
are device mapper devices; LVM uses device mapper, so one of those will
be created for each logical volume.

To expand a logical volume (such as one of the /dev/mapper devices
listed above), use lvextend to increase the size of the logical volume,
and then use resize2fs to increase the size of the filesystem on that
device.  If you are simply increasing the size (and not decreasing it),
you needn't provide a size to resize2fs; it will automatically determine
the correct size itself.  If the filesystems have been created with a
recent enough version of e2fsprogs, you can perform the resizing online;
that is, while the filesystem is mounted and in use.

brian m. carlson / brian with sandals: Houston, Texas, US
+1 832 623 2791 | http://www.crustytoothpaste.net/~bmc | My opinion only
OpenPGP: RSA v4 4096b: 88AC E9B2 9196 305B A994 7552 F1BA 225C 0223 B187

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