On 2/23/14, 3:37 AM, Marko Weber|8000 wrote:
>
>
> hello list,
>
> i have a question about mount options.
>
> at first my fstab:
>
> /dev/md0 /boot xfs noauto,noatime 1 2
> /dev/md2 / xfs
> noatime,nodiratime,nobarrier,largeio,discard,logbsize=256k,noikeep 0 1
I guess I won't ask why you decided to tweak all those knobs...
<snip>
> (YES!, normally i use Label or UUID..... but this is only a test machine.....)
>
>
> AFTER reboot "mount" shows this:
>
> rootfs on / type rootfs (rw)
> /dev/root on / type xfs
> (rw,noatime,nodiratime,attr2,nobarrier,inode64,noquota)
<snip>
default mount options
>
> on /dev/root "discrad" and some other are not shown
>
>
> when i do a "mount -o remount /"
>
> "mount" shows this:
>
>
> rootfs on / type rootfs (rw)
> /dev/root on / type xfs
> (rw,noatime,nodiratime,nobarrier,largeio,discard,logbsize=256k,noikeep)
> /dev/md1 on /tmp type xfs
> (rw,noexec,noatime,nodiratime,nobarrier,largeio,discard,logbsize=256k,noikeep)
tweaked options.
<snip>
>
> now,all options from /etc/fstab are listed.
> Is this XFS related?
Not really. Only some xfs options are remountable, so unless you originally
mounted with, say, "largeio" the option won't be in effect. Mount -o remount
won't enable it. So if you really want all those options enabled on your root
fs, you'll need to have them in your initrd/initramfs so that the original
mount of the root fs at boot time includes them.
Also, mount may be looking at /etc/mtab rather than /proc/mounts. /proc/mounts
contains the true state of the fileystem w.r.t. mount options. /etc/mtab is
managed by mount, and knows nothing about what the filesystem actually did:
[root@sandeen ~]# mount -o remount,notanoption /home
[root@sandeen ~]# mount | grep home
/dev/md2 on /home type xfs (rw,notanoption)
[root@sandeen ~]# grep home /proc/mounts
/dev/md2 /home xfs rw,seclabel,relatime,attr2,delaylog,noquota 0 0
-Eric
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