Unable to disable barriers

Unable to disable barriers

[Gary Hawco]

Subject pretty much says it all.

For testing purposes I tried to disable barriers in fstab (barriers=0).  On
reboot the filesystem will not mount read/write until barriers are reenabled.

This occurs whether I use ordered data mode or data writeback mode, in both
Gentoo and Slackware 12.1

Is this behavior by design (that barriers can not be disabled)?

Thanks,
Gary

Re: Unable to disable barriers

[Eric Sandeen]

Gary Hawco wrote:
> Subject pretty much says it all.
> 
> For testing purposes I tried to disable barriers in fstab (barriers=0).  On
> reboot the filesystem will not mount read/write until barriers are reenabled.

What errors do you get?

> This occurs whether I use ordered data mode or data writeback mode, in both
> Gentoo and Slackware 12.1
> 
> Is this behavior by design (that barriers can not be disabled)?
> 
> Thanks,
> Gary

Hm, it's not supposed to be :)

Perhaps you just spelled it wrong:

root@inode ~]# mount -o barriers=0 /dev/sdb2 /mnt/test
mount: wrong fs type, bad option, bad superblock on /dev/sdb2,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

[root@inode ~]# mount -o barrier=0 /dev/sdb2 /mnt/test
[root@inode ~]#

-Eric