* Re: users Digest, Vol 38, Issue 13 [not found] ` <mailman.1.1242270001.16807.users-JrjvKiOkagjYtjvyW6yDsg@public.gmane.org> @ 2009-05-14 17:39 ` Michael Niederle 2009-05-15 0:21 ` Ryusuke Konishi 0 siblings, 1 reply; 3+ messages in thread From: Michael Niederle @ 2009-05-14 17:39 UTC (permalink / raw) To: users-JrjvKiOkagjYtjvyW6yDsg 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. I have only one big problem: I twice corrupted the nilfs-superblock (due to inproper shutdown) leading to a complete data loss each time. 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 ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: users Digest, Vol 38, Issue 13 2009-05-14 17:39 ` users Digest, Vol 38, Issue 13 Michael Niederle @ 2009-05-15 0:21 ` Ryusuke Konishi [not found] ` <20090515.092143.09779544.ryusuke-sG5X7nlA6pw@public.gmane.org> 0 siblings, 1 reply; 3+ messages in thread From: Ryusuke Konishi @ 2009-05-15 0:21 UTC (permalink / raw) To: users-JrjvKiOkagjYtjvyW6yDsg, mniederle-RbZlAiThDcE; +Cc: Milos Jana 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 ^ permalink raw reply [flat|nested] 3+ messages in thread
[parent not found: <20090515.092143.09779544.ryusuke-sG5X7nlA6pw@public.gmane.org>]
* Re: users Digest, Vol 38, Issue 13 [not found] ` <20090515.092143.09779544.ryusuke-sG5X7nlA6pw@public.gmane.org> @ 2009-05-15 0:36 ` Ryusuke Konishi 0 siblings, 0 replies; 3+ messages in thread From: Ryusuke Konishi @ 2009-05-15 0:36 UTC (permalink / raw) To: users-JrjvKiOkagjYtjvyW6yDsg, mniederle-RbZlAiThDcE Cc: milosdsax-Re5JQEeQqe8AvxtiuMwx3w On Fri, 15 May 2009 09:21:43 +0900 (JST), Ryusuke Konishi wrote: > On Thu, 14 May 2009 19:39:16 +0200, "Michael Niederle" wrote: > > 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. Just a quick note. The write on unmount is already _DONE_ on the source code. I here mean some enhanced operation like diskcache flushing. Ryusuke Konishi ^ permalink raw reply [flat|nested] 3+ messages in thread
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2009-05-14 17:39 ` users Digest, Vol 38, Issue 13 Michael Niederle
2009-05-15 0:21 ` Ryusuke Konishi
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2009-05-15 0:36 ` Ryusuke Konishi
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