Date: Fri, 4 Mar 2011 21:48:34 +0100 From: Kai Gallasch <gallasch@free.de> To: freebsd-fs@freebsd.org Subject: gmirror + gjournal and write cache on drives enabled Message-ID: <BBBE0DEA-2CDC-453E-9AA6-A104F903A5E1@free.de>
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Hi.
I'm currently installing a server with 4 x SAS JBOD connected to an mpt(4) pseudo-raid controller.
# gmirror status
Name Status Components
mirror/gm0 COMPLETE da0
da1
/dev/mirror/gm0s1a.journal /
/dev/mirror/gm0s1d.journal /var
/dev/mirror/gm0s1e.journal /usr
/dev/mirror/gm0s1f.journal /usr/local
/dev/mirror/gm0s1g.journal /usr/src
/dev/mirror/gm0s1h.journal /usr/obj
in gjournal(8) I read:
"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."
Is this statement also true, if the JBODs have their write-cache enabled?
If yes, I'd gladly "gmirror configure -F" to avoid a full sync in case of a server crash, power loss, etc.
Kai.
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