Hi!
On Thu, 14 May 2009 19:39:16 +0200, "Michael Niederle" wrote:
> I'm evaluating nilfs as a replacement for the typical layered filesystem
> approach (unionfs, aufs) used in live-systems.
>
> nilfs performs incredibly well! Its sequential write / random read philosophy
> is great for accessing pen-drives.
Thanks, but I suspect partially the writes are not done on your
pendrive ;-)
> I have only one big problem: I twice corrupted the nilfs-superblock (due to
> inproper shutdown) leading to a complete data loss each time.
Yeah, that is a headache. Milos Jana has been reporting this issue
for long periods, but we haven't solved this yet.
What is your pendrive product?
I'd like to buy a pendrive to clarify the root cause of this problem.
BTW, could you try switching IO scheduler to "noop" ?
It can be done as follows:
# cd /sys/block/sda/queue
('sda' should be the device name of the pendrive)
# cat scheduler
anticipatory deadline [cfq] noop
# echo noop > scheduler
# cat scheduler
anticipatory deadline cfq [noop]
I think this would help to narrow down the problem.
> The todo-list mentions that more copies of the superblock are needed. I
> strongly agree! I think this should be one of the top items on the todo-list.
>
> Greetings, Michael
The latest nilfs already has secondary super block in tail of
partition. But it looks insufficient for this pendrive problem.
I think ensuring write on unmount should come before that.
Regards,
Ryusuke Konishi
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