I'm setting up a FC5 box for use with myth tv. I created a LVM on /dev/hd4 for recording use. after a reboot my LVM is not there. I checked the fstab and there is nothing in there for /dev/hda4.

The volume group I set up is called VGforMyth and the logical volume is called video.

[root@mythbox VGforMyth]# ls -alt
total 0
drwxr-xr-x 12 root root 3660 Oct 4 12:00 ..
drwx------ 2 root root 60 Oct 4 12:00 .
lrwxrwxrwx 1 root root 27 Oct 4 12:00 video -> /dev/mapper/VGforMyth-video

here is the output from fstab:

[root@mythbox etc]# more fstab
LABEL=/ / ext3 defaults 1 1
LABEL=/boot1 /boot ext3 defaults 1 2
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0
LABEL=SWAP-hda2 swap swap defaults 0 0
[root@mythbox etc]#


here is mtab:

[root@mythbox etc]# more mtab
/dev/hda3 / ext3 rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /boot ext3 rw 0 0
tmpfs /dev/shm tmpfs rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
automount(pid1711) /net autofs rw,fd=4,pgrp=1711,minproto=2,maxproto=4 0 0
/dev/mapper/VGforMyth-video /video ext3 rw 0 0
[root@mythbox etc]#

Did you read up on how LVM works? And fstab? For one, if /dev/hda4 is an LVM physical volume you will not be mounting that directly. So it should not be in /etc/fstab. If it is, it won't work. Two, your /etc/fstab will not be automagically updated when you create a new filesystem (be it on LVM or not). So if you didn't manually put the mount in there, it's not going to be there.

I imagine you are missing a line similar to the one below in your /etc/fstab. This is something that you would have needed to put there manually. It wouldn't just have automagically appeared!
The above example assumes your filesystem type is XFS and your mountpoint is /mythtv/recordings. You will need to change these as needed for your specifics.

Once you've added the appropriate line to your /etc/fstab, as root, run mount /mythtv/recordings to see if it works. Again, this example command assumes your mountpoint is /mythtv/recordings ... adjust as necessary.

I read a bit about LVM, guess I have MUCH more to go !

I updated the fstab as you suggested (for my specifics of course) and it is working well. Thanks for your help.

As a side question, would it be worth the effort to change the filesystem from ext3 to XFS for mythtv ?

Thanks again.

I use XFS myself, but who knows if I made the best choice?! I like the way it is very fast to delete large files. On the downside, XFS cannot be shrunk. So once you make is so big, or increase it with LVM and resizing, then you cannot later shrink it. I've never had a need to shrink a filesystem dedicated to MythTV recordings however. They just keep gowing and growing and growing...