Re: an mount option question and dunno if right here...

[Eric Sandeen <sandeen@sandeen.net>]

On 3/9/16 4:35 AM, Marko Weber | 8000 wrote:
> 
> 
> hello list,
> 
> my drives are all xfs formatted.
> in fstab i set:
> 
>                  lazytime,logbsize=256k,logbufs=8
> 
> 
> when i call "mount" on console i get:
> 
>                  rw,relatime,lazytime,attr2,inode64,logbufs=8,logbsize=256k,sunit=1024,swidth=3072,noquota
> 
> 
> Why is relatime listed? Or is lazytime override this setting?
> Even when i set "norelatime" in /etc/fstab i get "relatime" listed on 'mount'
> 
> Or am i wrong here with this question? is this not xfs related?
> anyway, for any hints or suggestions i am thankful

lazytime is not a valid xfs mount option:

[root ~]# mount -o lazytime /dev/sdb1 /mnt/test
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so

[root ~]# dmesg | tail -n 1
[645779.811802] XFS (sdb1): unknown mount option [lazytime].

I'm guessing this is your root fs? xfs today will silently ignore
unknown mount options on remount (patches to fix that are upstream),
and the root fs may get remounted w/ fstab options.  So presumably
that's how you got lazytime into the mount output, especially if
it's looking at /etc/mtab. Look in /proc/mounts; I doubt you'll
see "lazytime" for this filesystem:

[root ~]# mount /dev/sdb1 /mnt/test
[root ~]# mount -o remount,lazytime /mnt/test

[root ~]# grep sdb1 /etc/mtab /proc/mounts
/etc/mtab:/dev/sdb1 /mnt/test xfs rw,lazytime 0 0
/proc/mounts:/dev/sdb1 /mnt/test xfs rw,seclabel,relatime,attr2,inode64,noquota 0 0

-Eric

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