Hello all
I don't exactly know where to ask this question...
I have a situation of
sda1 + sdb1 --> MD raid1
Above that is an ext4 filesystem. No LVM.
I am making changes to that filesystem (vi a file) and then i am doing
sync
sync
(twice)
then I am starting KVM in snapshot mode on the sda and sdb disks so to
virtualize the same system on which I am operating.
kvm -m 1024 -hda /dev/sda -hdb /dev/sdb -snapshot
The strange thing is that the virtual machine is NOT seeing the latest
changes to that file!
Then I tried to do :
for i in /dev/md? /dev/sda /dev/sdb ; do blockdev --flushbufs $i ; done
and restart KVM,
and NOW it is seeing the changes.
In the past I had similar problems, and not knowing about blockdev
--flushbufs I ended up dismounting the filesystems and stopping the
RAIDs. That also appeared to actually commit stuff to disk.
So sync is not enough? Would somebody explain to me better?
Thank you
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