[rhelv6-list] Problems resizing tmpfs under RHEL6

[Udo]

Hello,

my RHEL6 works as expected (RAM 3GB, size=50% is the default):

tmpfs       /dev/shm                tmpfs   defaults        0 0
tmpfs                 1,5G   26M  1,5G   2% /dev/shm

tmpfs       /dev/shm                tmpfs   defaults,size=66%        0 0
tmpfs                 2,0G   26M  1,9G   2% /dev/shm

tmpfs       /dev/shm                tmpfs   defaults,size=33%        0 0
tmpfs                 984M   26M  959M   3% /dev/shm


Also with the size=Xg notation.


Udo



Am Dienstag, den 22.02.2011, 15:29 +0100 schrieb carlopmart:
> On 02/22/2011 02:44 PM, Benjamin Franz wrote:
> > On 02/21/2011 02:23 PM, carlopmart wrote:
> >> On 02/21/2011 11:10 PM, Benjamin Franz wrote:
> >>>
> >>> I have /dev/shm set to 8g on one of my machines using 'size=8g'.
> >>>
> >>
> >> Can you show your fstab entry for tmpfs Bejamin??
> >
> > tmpfs /dev/shm tmpfs size=8g 0 0
> >
> > Note: This is on a CentOS5.5 machine. I haven't tried it on a RH6 machine.
> >
> 
> Ok, and yes. Under centos 5 or rhel5 all works as expected (i have another rhel5 
> host and tmpfs works ok), but under rhel6 not. For example.
> 
> My fstab:
> 
> #
> # /etc/fstab
> # Created by anaconda on Sun Feb 20 14:33:14 2011
> #
> # 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
> #
> UUID=ea53b08b-1557-4e37-b88a-e3b672bcf569 /                       ext4    defaults 
>        1 1
> /dev/mapper/cryptvol-datavol /export/data            ext4    defaults        1 2
> /dev/mapper/luks-ac5ed44c-f316-4b3a-9b2d-c3c15228ce04 /export/home            ext4 
>    defaults        1 2
> UUID=d16b644b-020f-4693-bc21-e5d9aa9b8e7b swap                    swap    defaults 
>        0 0
> tmpfs                   /dev/shm                tmpfs   size=2g	        0 0
> devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
> sysfs                   /sys                    sysfs   defaults        0 0
> proc                    /proc                   proc    defaults        0 0
> 
> Output of mount command:
> 
> [carlos at rhel6srv tmp]$ mount
> /dev/sda1 on / type ext4 (rw)
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw,gid=5,mode=620)
> tmpfs on /dev/shm type tmpfs (rw,size=2g)
> /dev/mapper/cryptvol-datavol on /export/data type ext4 (rw)
> /dev/mapper/luks-ac5ed44c-f316-4b3a-9b2d-c3c15228ce04 on /export/home type ext4 (rw)
> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> 
> So far, everything is fine. But when I execute df command:
> 
> [carlos at rhel6srv tmp]$ df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/sda1             7.9G  2.7G  4.9G  36% /
> tmpfs                 1.5G  312K  1.5G   1% /dev/shm
> /dev/mapper/cryptvol-datavol
>                         63G  9.6G   51G  17% /export/data
> /dev/mapper/luks-ac5ed44c-f316-4b3a-9b2d-c3c15228ce04
>                         16G  3.7G   12G  25% /export/home
> 
>   .. shows only 50% of memory for tmpfs. Weird, right??
> 
>