Questions regarding journal replay

Eric Sandeen sandeen at
Wed Feb 25 16:31:42 UTC 2009

Ralf Hildebrandt wrote:
> * Ralf Hildebrandt <Ralf.Hildebrandt at>:
>> * Curtis Doty <Curtis at>:
>>> Yesterday Ralf Hildebrandt said:
>>>> The journal replay too quite a while. About 800 seconds.
>>> Were there any other background iops on the underlying volume 
>>> devices? Like maybe raid reconstruction?
>> I don't think so. The machine never powered off...
> Again, failed us and now we're encountering another journal
> replay. Taking ages. This sucks.
> Questions:
> How can I find out (during normal operation) HOW MUCH of the
> journal is actually in use?
> How can I resize the journal to be smaller, thus making a journal
> replay faster?

It'd be better to get to the bottom of the problem ... maybe iostat
while it's happening to see if IO is actually happening; run blktrace to
see where IO is going, do a few sysrq-t's to see where threads are at, etc.

Can you find a way to reproduce this at will?

Journal replay should *never* take this long, AFAIK.


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