Hello,
1st off, I am using ZFS under FreeBSD 7.0. Forgive me if this is the
wrong place (I do plan to post to FreeBSD as well, but this seems to be
more of a ZFS related question).
I am using a 3ware 9690SA-8E and two IBM EXP3000 chasis. One issue is the
3ware card isn't hard setting the enclosure IDs on the chasis (and I have
a ticket on that with them) but that isn't why I am posting this, that is
how I discovered this.
I have a RAID 10 configuration as follows (da0-da11 is one encl and
da12-da23 is the other)
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
mirror ONLINE 0 0 0
da0 ONLINE 0 0 0
da12 ONLINE 0 0 0
mirror ONLINE 0 0 0
da1 ONLINE 0 0 0
da13 ONLINE 0 0 0
mirror ONLINE 0 0 0
da2 ONLINE 0 0 0
da14 ONLINE 0 0 0
mirror ONLINE 0 0 0
da3 ONLINE 0 0 0
da15 ONLINE 0 0 0
mirror ONLINE 0 0 0
da4 ONLINE 0 0 0
da16 ONLINE 0 0 0
mirror ONLINE 0 0 0
da5 ONLINE 0 0 0
da17 ONLINE 0 0 0
mirror ONLINE 0 0 0
da6 ONLINE 0 0 0
da18 ONLINE 0 0 0
mirror ONLINE 0 0 0
da7 ONLINE 0 0 0
da19 ONLINE 0 0 0
mirror ONLINE 0 0 0
da8 ONLINE 0 0 0
da20 ONLINE 0 0 0
mirror ONLINE 0 0 0
da9 ONLINE 0 0 0
da21 ONLINE 0 0 0
mirror ONLINE 0 0 0
da10 ONLINE 0 0 0
da22 ONLINE 0 0 0
spares
da11 AVAIL
da23 AVAIL
I can cause each enclosure to assume either encl 0 or encl 1 (thus
flip-flopping da0-da11 with drives of da12-da23 and visversa. The pool
will come up fine either way (even though the devs move around). Which is
great. If I bring down one of the enclosures, it comes up on da0-da11
fine. If I bring that down and bring up the opposite, da0-da11 come up
failed and the rest unavailable (since the other encl is down.
My question is (finally, sorry)...it appears ZFS doesn't care if I flip
the sides of the mirror around but always, the enclosure that was
origionally encl 1 (orig set up da12-da23) will never come up by
itself...why is that if this encl can assume 0 and the other assume 1 and
the zfs pool will come up that way?
Thanks!
Weldon
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