On 13/01/2011 19:37, Lev Serebryakov wrote:
Hello, Freebsd-geom.
You wrote 13 января 2011 г., 18:24:18:
I have mirrored PARTITION (/dev/ad4s1d + /dev/ad6s1d) with UFS with
label on it. This label is shown in /dev/ufs when geom_mirror is
loaded.
When geom_mirror is NOT loaded both ad4s1d and ad6s1d are valid,
complete, clean filesystems, but here is no /dev/ufs entries for them,
and kernel can not mount FSes at all.
And even worse: it sees ONE of all FSes and when "geom_mirror" is
loaded, it puck up one of components from "/dev/ufs/home" instead of
device node and everything hangs up due to loop (?)...
Yes, gmirror and glabel are known to interact badly because of such edge
cases - since glabel presents the whole underlying device in pretty much
the same way as the original device entry, gmirror cannot distinguish
between the two. You could use the "-h" argument to "gmirror create" to
get around this.
Since this is so common and has also bitten me in the past, I wonder if
some kind of avoidance detection mechanism could be created in gmirror?
I'm thinking of making glabel expose a GEOM property like "fslabel"
meaning "this device entry comes from a file system label, not a device
or native glabel label" and making gmirror search for this property and
skip tasting for devices having it?
Pawel?
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