Jürgen Keil wrote:
I have my /usr filesystem configured as a zfs filesystem,
using a legacy mountpoint. I noticed that the system boots
with atime updates temporarily turned off (and doesn't record
file accesses in the /usr filesystem):
# df -h /usr
Filesystem size used avail capacity Mounted on
files/usr-b57 98G 2.1G 18G 11% /usr
# zfs get atime files/usr-b57
NAME PROPERTY VALUE SOURCE
files/usr-b57 atime off temporary
That is, when a zfs legacy filesystem is mounted in
read-only mode, and then remounted read/write,
atime updates are off:
# zfs create -o mountpoint=legacy files/foobar
# mount -F zfs -o ro files/foobar /mnt
# zfs get atime files/foobar
NAME PROPERTY VALUE SOURCE
files/foobar atime on default
# mount -F zfs -o remount,rw files/foobar /mnt
# zfs get atime files/foobar
NAME PROPERTY VALUE SOURCE
files/foobar atime off temporary
Is this expected behaviour?
I suspect it's related to this bug:
http://bugs.opensolaris.org/view_bug.do?bug_id=6498096
which is "zfs noatime broken with legacy mount".
I started fixing this a while back but never finished
it. Is this causing you pain, or is it just something
you noticed?
-Chris
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