Question about fstab

centosfan · 08-12-2009, 01:32 PM

I have 2 disks on my new machine,and second machine is /dev/sdb1 mounted to /disk1.I unmounted that and formated disk by using LVM,i created first pyshical then volume group and then created two volume partitions with size 150 gb and 20 gb.Rest of space,(disk have 230 gB)will be used when i will be needed.What is bother me now,i see in fstab there is still value
/dev/sdb1 /disk1.Purpose of fstab is to automont partitions right?
So what i would need to is to remove that line(/dev/sdb1 /disk1 ext3 defaults,noatime 0 0)
and replace it with /dev/mapper/volume001 ext3 defaults,noatime 0 0
and add /dev/mapper/volume002 ext3 defaults,noatime 0 0 for every other volume.Also,there wont be any problems caused beacuse entire hard disk space is not used(right now two volume partition of 150 GB and 20 GB)?

David the H. · 08-12-2009, 03:30 PM

Quote:

Originally Posted by JACOBKELL

Purpose of fstab is to automont partitions right?

Not exactly. The main purpose of fstab is to pre-define mount actions, so that you don't have to manually type in complex mount commands all the time. Now by default your system will mount all fstab entries on boot-up (unless "noauto" is added as an option), since the OS needs access to the main system drives at least, but that's not the same thing as an "automount".

Quote:

So what i would need to is to remove that line
(/dev/sdb1 /disk1 ext3 defaults,noatime 0 0)

and replace it with
/dev/mapper/volume001 /disk1 ext3 defaults,noatime 0 0

and add
/dev/mapper/volume002 /newmountpoint ext3 defaults,noatime 0 0
for every other volume.

You need to define a mount point for each drive, as I've flagged above. I'm assuming you want to keep the same mount point from the old settings fort he first partition, but you need to create a new, separate mount point for the other(s).

Quote:

Also,there wont be any problems caused beacuse entire hard disk space is not used(right now two volume partition of 150 GB and 20 GB)?

No, there's no problem with extra undefined space, or even partitioned space. fstab only pays attention to the partitions you configure.

centosfan · 08-14-2009, 08:09 AM

Ok my old fstab is

PHP Code:



LABEL=/                 /                       ext3    defaults        1 1 
LABEL=/boot             /boot                   ext3    defaults        1 2 
tmpfs                   /dev/shm                tmpfs   defaults        0 0 
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0 
sysfs                   /sys                    sysfs   defaults        0 0 
proc                    /proc                   proc    defaults        0 0 
LABEL=SWAP-sda3         swap                    swap    pri=0,defaults        0 0 
/dev/sdb1               /disk1                  ext3    defaults,noatime        0 0

And new one:

PHP Code:



LABEL=/                 /                       ext3    defaults        1 1 
LABEL=/boot             /boot                   ext3    defaults        1 2 
tmpfs                   /dev/shm                tmpfs   defaults        0 0 
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0 
sysfs                   /sys                    sysfs   defaults        0 0 
proc                    /proc                   proc    defaults        0 0 
LABEL=SWAP-sda3         swap                    swap    pri=0,defaults        0 0 
/dev/vg1/volume1            /volume1                  ext3    defaults,noatime        0 0

Also i have one more logical volume which i wont add it to fstab or mount ever beacuse it is made for virtual machine.Will that cause any problem?

David the H. · 08-14-2009, 02:11 PM

No problems at all. Like I said, all fstab does is provide shortcuts for the mount command: "mount device-a at location-b, using configuration c". Then you only need to use "mount device-a" or "mount location-b" to run that command. Read "man mount" for more details.

Or you can mount everything in the file at once with "mount -a" (this is what your system does at startup).

If you can mount your drives like that with no errors, then you're done.