Date: Sat, 10 Oct 2009 12:37:42 -0700 From: David Ehrmann <ehrmann@gmail.com> To: freebsd-current@freebsd.org Subject: Strange md/unionfs issue Message-ID: <4AD0E286.9030508@gmail.com>
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I have a system running on a flash disk. To prevent it from wearing out quickly, I don't run with a swap and mount /tmp and /var from memory. Because /var needs some directories and contains files I probably should save from time to time, I mount it from flash, mount /var to /var_real so I can access the underlying files, and then I mount an md device on top of /var as a unionfs. Initially, it seems to work, but seconds later, the unionfs seems to fail. server# cd /var server# ls .snap crash heimdal preserve yp account cron log run at db mail rwho audit empty msgs spool backups games named tmp server# mount /dev/ad0s1a on / (ufs, NFS exported, local) devfs on /dev (devfs, local, multilabel) /dev/ad0s1f on /usr (ufs, local, soft-updates) /dev/ad0s1e on /var (ufs, local, soft-updates) /var on /var_real (nullfs, local, noatime) /dev/md0 on /var (ufs, local, union, soft-updates) /dev/md1 on /tmp (ufs, local, soft-updates) server# cd /var_real/ server# ls .snap crash heimdal preserve yp account cron log run at db mail rwho audit empty msgs spool backups games named tmp server# cd /var server# ls .snap server# Removing /var_real from the fstab didn't help. Here's the full version: # Device Mountpoint FStype Options Dump Pass# /dev/ad0s1a / ufs rw 1 1 /dev/ad0s1f /usr ufs rw 2 2 /dev/ad0s1e /var ufs rw 2 2 /var /var_real nullfs rw,noatime md /var mfs rw,union,-s128M md /tmp mfs rw,-s128M Ideas?
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