Updated gjournal patches [20061024].

[Fluffles]

Addendum: i tried gjournal on a single disk now without any GEOM layers
on it, but it still crashes with the same error.

- Veronica



Fluffles wrote:
> Hi Pawel,
>
> I've tried your recent (20061024) gjournal patches on my test
> fileserver, which is an amd64 FreeBSD7 box with 8 SATA disks. I'm
> currently using graid5 on it, with success.
> I've also tried using gjournal, but with little success. The
> compilation/installation and creation of the journal device goes as
> planned, but i get kernel panics not long after i start writing to it. A
> "newfs -b 65536 /dev/raid5/sophia.journal" quickly panicked the system.
> After that i tried without the -b parameter; that appeared to work but
> not long after i got a panic again; same panic as before.
>
> Please look at the screenshot i made of the panic message:
> http://dev.fluffles.net/images/gjournal-panic1.png
>
> Do you know what could be causing the panic? The panic message itself is
> not very explanatory. ;-)
> Perhaps gjournal doesn't play nice with graid5? I haven't tried it on a
> single disk, yet.
>
> Also i have a question about it's performance. You mentioned earlier
> that writing big files takes about twice as long with gjournal, i wonder
> if this is inherit to journaling itself or due to the current
> implementation. Windows' journaling NTFS, for example, isn't slower than
> FAT32 with big files if i remember correctly. What major differences in
> the journaling process causes this?
>
> Also, in your earlier post you explained the advantages of a journal
> with regard to significantly reduces fsck times at boot. But my major
> concern is dataloss: on my testserver i've had many kernel
> panics/freezes due to the experimental graid5 module being tested by
> Arne. This has resulted in the system not being able to boot because the
> ad0s2a (read: a!) partition has lost files. And it won't be the first
> time a lockup or power failure caused dataloss on my systems. That's why
> i want to use gjournal: to protect from dataloss. Am i correct in my
> assumption that gjournal addresses my needs in this regard?
>
> Greetings,
>
> Veronica
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