Hello list, I currently have 2 raid5 arrays in my box, and like the idea of using aufs2 to combine them for the purposes as nfs and the like. This all works really well as far as I can tell. The problem lies when writing data to the combined directory.
There are 2 directory structures on both arrays, lets's say /raid5.1/dirA and /raid5.2/dirB. This is currently visible as /dirA and /dirB on my share. All's well so far. However If I write data into dirB, a new dir is created on /raid5.1/dirB. Every few months I unmount my aufs and relocate everything into the right place. Reading the aufs 2.1 manual page however, there is a chapter called: Policies to Select One among Multiple Writable Branches and going through it, as I understand it pmfs would do just that? "create=pmfs[:second] Selects a writable branch where the parent dir exists, such as tdp mode. When the parent dir exists on multiple writable branches, aufs selects the one which has most free space, such as mfs mode." Perfect, but doesn't work. I still get disk full errors (on nfs shares) when /raid5.1/(dirB) is full, even though it was supposed write into /raid5.2/dirB; which might be just how things work, but underneath, everything still always gets written to /raid5.1/. my fstab looks like this: none /silo aufs br=/tank/01:/tank/02,sum,udba=none,create=pmfs,cpup=bup 0 0 though i'm not sure cpup is even needeed? Any thoughts would be appreciated, Oliver /proc/mounts /dev/md101 /tank/01 ext4 rw,noatime,commit=120,barrier=1,stripe=192,data=writeback 0 0 /dev/md102 /tank/02 ext4 rw,noatime,commit=120,barrier=1,stripe=256,data=writeback 0 0 none /silo aufs rw,relatime,si=66882011d69539b5,udba=none,create=pmfs,cpup=bup,sum 0 0 /sys/module/aufs/* riley ~ # cat /sys/module/aufs/* cat: /sys/module/aufs/holders: Is a directory live cat: /sys/module/aufs/notes: Is a directory cat: /sys/module/aufs/parameters: Is a directory 5 cat: /sys/module/aufs/sections: Is a directory 9A243B57E512A94D36FD5FB 2.1-standalone.tree-36-20110117 riley ~ # cat /sys/module/aufs/*/* 1 0xffffffffa006eed4 0xffffffffa006f198 0xffffffffa006eca8 kernel Linux riley 2.6.36-gentoo-r5 #2 SMP Tue Jan 25 20:15:51 CET 2011 x86_64 AMD Phenom(tm) II X4 905e Processor AuthenticAMD GNU/Linux modinfo aufs module modinfo aufs filename: /lib/modules/2.6.36-gentoo-r5/misc/aufs.ko version: 2.1-standalone.tree-36-20110117 description: aufs -- Advanced multi layered unification filesystem author: Junjiro R. Okajima <aufs-users@lists.sourceforge.net> license: GPL srcversion: 9A243B57E512A94D36FD5FB depends: vermagic: 2.6.36-gentoo-r5 SMP mod_unload parm: brs:use <sysfs>/fs/aufs/si_*/brN (int) ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d
