Questions regarding journal replay
Eric Sandeen
sandeen at redhat.com
Wed Feb 25 19:28:35 UTC 2009
Ralf Hildebrandt wrote:
> * Eric Sandeen <sandeen at redhat.com>:
>
>>>> 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.
>>> We had 24GB of reading from the journal device (or 12GB if it's
>>> 512byte blocks). I wonder why?
>> 24GB of reading from the journal device (during that 800s of replay
>> during mount?), and your journal is 128M ... well that's odd.
>
> After my initial report I removed the journal and created an external
> journal on a 32GB partition. Hoping it would be faster, since
> accoriding to the docs. the journal size is limited to 128MB.
>
>> You say journal device; is this an external journal? I didn't think so
>> from your first email, but is it?
>
> It is now.
...
> Journal block size: 4096
> Journal length: 8488436
> Journal first block: 2
> Journal sequence: 0x0027c611
> Journal start: 2
> Journal number of users: 1
> Journal users: 032613d3-6035-4872-bc0a-11db92feec5e
Ok we might be getting a little off-track here. Your journal is indeed
32G in size. But you also saw this with an internal journal, which
should be limited to 128M, and yet you still saw a very long replay, right?
-Eric
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