# uname -a
Linux butt1 2.6.32.32-0.1-default #1 SMP Mon Mar 14 12:33:30 MSK 2011
x86_64 x86_64 x86_64 GNU/Linux
# zcat /proc/config.gz | grep AUFS
CONFIG_AUFS_FS=y
# CONFIG_AUFS_BRANCH_MAX_127 is not set
# CONFIG_AUFS_BRANCH_MAX_511 is not set
CONFIG_AUFS_BRANCH_MAX_1023=y
# CONFIG_AUFS_BRANCH_MAX_32767 is not set
CONFIG_AUFS_SBILIST=y
# CONFIG_AUFS_HNOTIFY is not set
# CONFIG_AUFS_RDU is not set
# CONFIG_AUFS_SP_IATTR is not set
# CONFIG_AUFS_SHWH is not set
# CONFIG_AUFS_BR_RAMFS is not set
# CONFIG_AUFS_BR_FUSE is not set
CONFIG_AUFS_BR_HFSPLUS=y
CONFIG_AUFS_BDEV_LOOP=y
# CONFIG_AUFS_DEBUG is not set
# cat /proc/mounts
rootfs / rootfs rw 0 0
udev /dev tmpfs rw,relatime,mode=755 0 0
/dev/sda2 / xfs rw,relatime,attr2,noquota 0 0
/proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620 0 0
/dev/sda1 /boot ext3
rw,relatime,errors=continue,user_xattr,acl,data=writeback 0 0
/dev/sdb /mnt/g1/0 xfs rw,relatime,attr2,noquota 0 0
/dev/sdc /mnt/g2/0 xfs rw,relatime,attr2,noquota 0 0
/dev/md2 /mnt/backup_mirror_0001 xfs
rw,noatime,nodiratime,attr2,inode64,logbufs=8,logbsize=256k,noquota 0
0
/dev/md0 /mnt/backup_mirror_0002 xfs
rw,noatime,nodiratime,attr2,inode64,logbufs=8,logbsize=256k,noquota 0
0
/dev/md1 /mnt/backup_mirror_0003 xfs
rw,noatime,nodiratime,attr2,inode64,logbufs=8,logbsize=256k,noquota 0
0
/dev/md3 /mnt/backup_mirror_0004 xfs
rw,noatime,nodiratime,attr2,inode64,logbufs=8,logbsize=256k,noquota 0
0
/dev/md4 /mnt/backup_mirror_0005 xfs
rw,noatime,nodiratime,attr2,inode64,logbufs=8,logbsize=256k,noquota 0
0
/dev/sda7 /db xfs rw,relatime,attr2,noquota 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
/dev/sdi /xino ext3 rw,relatime,errors=continue,data=writeback 0 0
none /mnt/backup_mirror_global aufs
rw,relatime,si=586e167e8b86b525,create=mfs,sum 0 0
# cat /sys/module/aufs/parameters/brs
1
Reproduce:
# free -m
total used free shared buffers cached
Mem: 3895 309 3585 0 0 141
-/+ buffers/cache: 167 3727
Swap: 0 0 0
# dd if=/dev/zero of=test2
^C9697128+0 records in
9697128+0 records out
4964929536 bytes (5.0 GB) copied, 54.2538 s, 91.5 MB/s
# free -m
total used free shared buffers cached
Mem: 3895 3861 33 0 0 3693
-/+ buffers/cache: 167 3727
Swap: 0 0 0
# cat /proc/meminfo | grep Cache
Cached: 3646976 kB
SwapCached: 0 kB
# rm -rf test2
# free -m
total used free shared buffers cached
Mem: 3895 238 3656 0 0 71
-/+ buffers/cache: 166 3728
Swap: 0 0 0
# cat /proc/meminfo | grep Cache
Cached: 49656 kB
SwapCached: 0 kB
butt2:/mnt/test_storage #
When I write to the mount point. All my memory is gone..
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