[SOLVED] New fstab line for CentOS 7 backup, any issues?

ohmster · 05-21-2015, 02:15 AM

Hi, I have gotten some terrific help here with backup ideas for the reconditioned older PC that I want to use for my Linux server. Now I have a great rsync backup script from jlinkels and it works really well.

I need an fstab entry for this new drive. I used gparted to make it a single parition ext drive with the label "USB-Backup". Nice.

For the /etc/fstab file, I used this line initially:

Code:

LABEL=USB-Backup        /mnt/backup              ext4    defaults        0 0

This method works but if the drive is not plugged in, CentOS 7 will hang at boot and dump me into an emergency shell. Not good. Next I tried this fstab line:

Code:

LABEL=USB-Backup        /mnt/backup              ext4    noauto,x-systemd.automount      0 0

THIS works extremely well. But I never heard of using systemd in an fstab file before so I would appreciate if any experienced members see anything wrong with it, before it is too late. Is this a safe, dependable method of mounting the drive or is there something better suited to this application for a backup USB drive?

EVERYTHING in the fstab file endes with zeros. Is this normal? I thought that the last digit was a "checking order" number for fsck. With everything 0, will that cause any foreseeable problems?

Code:

#
# /etc/fstab
# Created by anaconda on Tue Apr 28 04:54:46 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos_linux--server-root /                       xfs     defaults        0 0
UUID=787b75ae-64e1-4d33-bc8c-8a8b8af52a09 /boot                   xfs     defaults        0 0
/dev/mapper/centos_linux--server-home /home                   xfs     defaults        0 0
/dev/mapper/centos_linux--server-swap swap                    swap    defaults        0 0
LABEL=USB-Backup        /mnt/backup              ext4    noauto,x-systemd.automount      0 0

Everything here look safe and dependable? Thanks for your help. I would really like to get this right the first time.

rknichols · 05-21-2015, 08:08 AM

The zeros are normal. The xfs filesystem is not checked/repaired automatically at boot time. See link1, link2.

ohmster · 05-21-2015, 04:02 PM

Quote:

Originally Posted by rknichols

The zeros are normal. The xfs filesystem is not checked/repaired automatically at boot time. See link1, link2.

Oh this is terrific! I would never have thought to look up links like that by that name. Okay, that is exactly what I need to know. Gold star for your shirt collar for the rest of the day! Thank you rknichols.

rknichols · 05-21-2015, 04:54 PM

Quote:

Originally Posted by ohmster

I would never have thought to look up links like that by that name.

The only terms in my search were "xfs" and "fsck". Of course, it did help that I just wanted to find an authoritative source for what I already knew was normal.

ohmster · 05-22-2015, 12:00 AM

Quote:

Originally Posted by rknichols

The only terms in my search were "xfs" and "fsck". Of course, it did help that I just wanted to find an authoritative source for what I already knew was normal.

Way to go rknichols! I did the fsck Google but was missing the xfs part because that is really new to me. Is xfs a new Linux file system or is it used elsewhere like sdcards, memory cards, and other storage needs? Not important, just if you have the time and feel like talking I would love to hear it. Thanks buddy!

rknichols · 05-22-2015, 08:50 AM

Wikipedia can be a useful resource, regardless of whether you believe everything you find there. http://en.wikipedia.org/wiki/XFS#History

onebuck · 05-22-2015, 09:08 AM

Moved: This thread is more suitable in <CentOS> and has been moved accordingly to help your thread/question get the exposure it deserves.