fOn Sep 25, 2006, at 09:55 , Alban Hertroys wrote:
On Sep 25, 2006, at 8:36, Johan Ström wrote:
What exactly does
kernel dumps on /dev/mirror/gm0s1b
mean? Not that it saves any kernel dumps at least.. But otoh I
have no clue why it
It means exactly that. IIRC kernel dumps are created in swap space
and on the next boot are moved to ${dumpdir}. I'm pretty certain
this is explained nicely in the handbook[1].
Probably is, yes I know what it means, I was just pretty upset at the
moment..;)
AFAIK kernels can only be dumped on real devices, not on virtual
devices like /dev/mirror/*. In that case your setup is not going to
get you any dumps.
In earlier FBSD (6.0 i think?) one got an ioctl error when trying to
dumpon to a gmirror device, but if I dont recall wrong this has been
changed since (I dont get an ioctl error anymore at least...)
Besides that, it is probably not a very good idea to mirror your
swap. I am certain it is bad for performance, if it'd gain you
reliability is beyond my knowledge. This has been discussed before,
you probably want to check the archives.
Performance yes, but I think I've read that it is "best" anyway, if
one of your disks dies, youd dont want to loose half your swap since
that would not be very good if there is anything swapped out to that
disk..
[1] Which I didn't check as I'm about to be in a hurry...
--
Alban Hertroys
Priest to alien: "We want to know, is there a higher
being?".
Alien: "Well, actually that's why we're here,
we're sheer out of virgins".
!DSPAM:259,45178b407241208415560!
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