On Wed, May 8, 2013 at 12:55 AM, Walter Dnes <waltd...@waltdnes.org> wrote: > I'm running mdev, so that may be related. Here's my story... a script > I run to automatically process digital photos started blowing up on me. > After much bashing of head against brick wall, I determined that > /dev/shm now has an absolute max size of 10 megabytes! Any larger files > could not be written to it. Here's all the uncommented stuff in /etc/fstab > > > /dev/sda5 / ext2 noatime,nodiratime,async 0 1 > /dev/sda7 /home reiserfs noatime,nodiratime,async,notail 0 1 > /home/bindmounts/opt /opt auto bind 0 0 > /home/bindmounts/var /var auto bind 0 0 > /home/bindmounts/usr /usr auto bind 0 0 > /home/bindmounts/tmp /tmp auto bind 0 0 > /dev/sda6 none swap sw 0 0 > /dev/cdrom /mnt/cdrom iso9660 noauto,users,ro 0 0 > /dev/sr0 /mnt/dvd auto noauto,users,ro 0 0 > devpts /dev/pts devpts defaults 0 0 > none /dev/shm tmpfs rw,noatime,noexec,nosuid,nodev 0 0 > > Meanwhile, my netbook, with the /dev/shm line commented out, runs just > fine and handles large files in /dev/shm. I followed the example at > http://wiki.gentoo.org/wiki/Complete_Handbook/Configuring_the_system > with slightly more paranoid settings, e.g. noexec. What gives?
You can forcefully specify the size of /dev/shm like this: none /dev/shm tmpfs defaults,size=10G 0 0 But it should default to 50% of your system RAM... weird... do you have any local scripts that are remounting it, maybe? There's a lot more information in the kernel documentation: /usr/src/linux//Documentation/filesystems/tmpfs.txt The default fstab from latest baselayout does not contain /dev/shm at all: # /etc/fstab: static file system information. # # noatime turns off atimes for increased performance (atimes normally aren't # needed); notail increases performance of ReiserFS (at the expense of storage # efficiency). It's safe to drop the noatime options if you want and to # switch between notail / tail freely. # # The root filesystem should have a pass number of either 0 or 1. # All other filesystems should have a pass number of 0 or greater than 1. # # See the manpage fstab(5) for more information. # # <fs> <mountpoint> <type> <opts> <dump/pass> # NOTE: If your BOOT partition is ReiserFS, add the notail option to opts. /dev/BOOT /boot ext2 noauto,noatime 1 2 /dev/ROOT / ext3 noatime 0 1 /dev/SWAP none swap sw 0 0 /dev/cdrom /mnt/cdrom auto noauto,ro 0 0 /dev/fd0 /mnt/floppy auto noauto 0 0
