gmirror + gjournal setup question

Gabriel Lavoie glavoie at
Thu Nov 6 05:24:22 PST 2008

Thanks for your reply. I finally understood that with the "power failure"
tests I made.


2008/11/6 Volodymyr Kostyrko <c.kworr at>

> Gabriel Lavoie wrote:
>> Hello,
>>     I would like to know what is the best way to setup gmirror + gjournal,
>> on a slice level on two hard drives. Do I set up a mirrored journal
>> partition + mirrored journalized slice (gmirror on top of gjournal) on
>> which
>> I create my labels with bsdlabels (will create /dev/mirror/name.journal,
>> /dev/mirror/name.journala, /dev/mirror/name.journalb). Or I setup a
>> journalized slice on both hard drive and then I mirror /dev/ad0s1.journal
>> and /dev/ad1s1.journal (gjournal on top of gmirror)? I have hard time to
>> figure out what would be the best, if I want to avoid mirror rebuild on
>> power failure and I want fast fsck. I'd also like to make this setup on my
>> 1st slice (which contains the root filesystem).
> man gjournal:
> ...
>     When gjournal is configured on top of gmirror(8) or graid3(8)
> providers,
>     it also keeps them in a consistent state, thus automatic
> synchronization
>     on power failure or system crash may be disabled on those providers.
> ...
> I think journaling a mirrored partition can be much better.
> --
> Sphinx of black quartz judge my vow.
> _______________________________________________
> freebsd-questions at mailing list
> To unsubscribe, send any mail to "
> freebsd-questions-unsubscribe at"

Gabriel Lavoie
glavoie at

More information about the freebsd-questions mailing list