LVM Extend… not sure the filesystem

Question

I would like to extend my LVM partition. First I did

lvextend -L +100G /dev/server/home

Now I still have to extend the filesystem. The tutorials tell me to use resize2fs, but that only works for ext2 and ext3. I'm not even sure what filesystem I have...

fdisk /dev/server/home/

doesn't work... how do I know what kind of filesystem I have on my lvm partition?

Answer 1

If it's a mounted filesystem, you can use df -hT:

$ df -hT
Filesystem    Type    Size  Used Avail Use% Mounted on
/dev/sda1     ext4    5.5G  3.0G  2.3G  58% /
none      devtmpfs    229M  252K  229M   1% /dev
none         tmpfs    233M     0  233M   0% /dev/shm
none         tmpfs    233M  100K  233M   1% /var/run
none         tmpfs    233M     0  233M   0% /var/lock
none         tmpfs    233M     0  233M   0% /lib/init/rw

The "type" column indicates the filesystem in use; the "filesystem" column is the partition/device where it's located. (This example is from an Ubuntu Lucid system; my Debian system displays the root partition filetype as rootfs instead of the correct ext3.)

If the filesystem is not mounted, or df displays it as type rootfs, you can use a tool such as blkid, which checks the device more directly:

$ sudo blkid /path/to/filesystem/device
/dev/sda1: UUID="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" TYPE="ext4"

Answer 2

A recent version of GNU file will also tell you (so long as provide the flags for it to follow symlinks and look 'in' device special files):

[dan@khorium ~]$ sudo file -Ls /dev/vgcore/home
/dev/vgcore/home: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files)