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Date:      Sat, 30 Jan 2010 13:07:46 +0200
From:      Nikos Vassiliadis <nvass9573@gmx.com>
To:        Miroslav Lachman <000.fbsd@quip.cz>
Cc:        freebsd-rc@FreeBSD.org, freebsd-geom@freebsd.org
Subject:   Re: ordering problem with gjournal and iSCSI initiator
Message-ID:  <4B641302.7040301@gmx.com>
In-Reply-To: <4B5CD0AC.7090302@quip.cz>
References:  <4B5CD0AC.7090302@quip.cz>

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On 1/25/2010 12:58 AM, Miroslav Lachman wrote:
> Hi,
>
> I don't know what mailing list is better for this problem, so I post to
> both.
>
> I have server with local partition using gjournal (mfid0s2f.journal).
> It is mounted from fstab by this line:
>
> /dev/mfid0s2f.journal /vol0 ufs rw,async,nosuid,noexec,noatime 2 2
>
> Then I have storage connected by iSCSI initiator by attached rc script.
> It should be mounted by this script according to fstab.iscsi line:
>
> /dev/da0p1.journal /vol1 ufs rw,async,nosuid,noexec,noatime 2 2
>
> But there is a problem, both partitions are journaled and journal is on
> local disk.
>
> It means that only the first partition is checked and mounted at boot time.
>
> GEOM_JOURNAL: Journal 2395012627: mfid0s2d contains journal.
> GEOM_JOURNAL: Journal 1544711416: mfid0s2e contains journal.
> GEOM_JOURNAL: Journal 2395012627: mfid0s2f contains data.
> GEOM_JOURNAL: Journal mfid0s2f clean.
> GEOM_JOURNAL: BIO_FLUSH not supported by mfid0s2d.
> GEOM_JOURNAL: BIO_FLUSH not supported by mfid0s2f.
> Root mount waiting for: GJOURNAL
> Root mount waiting for: GJOURNAL
> Root mount waiting for: GJOURNAL
> Root mount waiting for: GJOURNAL
> Root mount waiting for: GJOURNAL
> GEOM_JOURNAL: Timeout. Journal gjournal 1544711416 cannot be completed.
>
> This is because second data provider is not available at this time.
> rc.d/iscsi is executed later. (after NETWORKING, SERVERS, before DAEMON)
>
> But da0p1.journal is not created later (after iscsi created /dev/da0)
> with this message:
> GEOM_JOURNAL: Journal 1544711416: da0p1 contains data.
> GEOM_JOURNAL: Timeout. Journal gjournal 1544711416 cannot be completed.
>
> And that's why /vol1 can't be mounted by rc.d/iscsi.
>
> My question is: Is there any "Right Way" to handle this case?
>
> How can I "create" da0p1.journal later and complete the gjournal + mount?

gjournal should have both data and journal providers available to
create the .journal consumer. You can force a geom taste, so gjournal
will check again the devices, if you open the device for writing.
A trick suggested by pjd@ is doing a simple:
true > /dev/$data_device
true > /dev/$journal_device

This will create the .journal and you'll be able to mount the
filesystem living on it. So, modify the rc script accordingly to
do the operation automatically.

HTH, Nikos



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