gmirror comes up DEGRADED

[Pawel Jakub Dawidek]

On Sat, Dec 16, 2006 at 03:37:15PM +0100, Max Laier wrote:
> Hi,
> 
> I'm new to really playing with gmirror and friends, so please forgive me 
> if this is a FAQ - my searches didn't turn up anything.  Please CC me, 
> for I'm not on the list.
> 
> Following setup: 6.2-pre as of Wednesday
> 
> ad0, ad2	250G ata on
> 		atapci0 at pci0:31:1:	class=0x010180 card=0x80281043 chip=0x244b8086 
> 					rev=0x05 hdr=0x00
> 		    vendor   = 'Intel Corporation'
> 		    device   = '82801BA (ICH2) UltraATA/100 IDE Controller'
> 		    class    = mass storage
> 		    subclass = ATA
> 
> mirror/gm0	over ad0, ad2
> 
> mirror/gm0s1	spanning all of the available space on gm0
> mirror/gm0s1a	spanning all of the available space on gm0s1
> 
> mirror/gm0s1a.bde	gbde encryption on gm0s1a.bde
> 
> Now if I wait for the mirror to get in sync and do a reboot, it comes up 
> DEGRADED and resyncs ad0 (again) :-\  Does that mean I have to stop 
> everything manually before rebooting?  Is there a fundamental error in 
> the setup that I can remedy?  How do you do this right?  It certainly is 
> not a good idea to do it the other way round (i.e. mirror two gbde 
> provider), right?
> 
> Any help greatly appreciated.

If I read the code properly, the problem you are seeing is because gbde
doesn't close its consumers on shutdown. It opens consumer r1w1e1 on
attach, but it only close it on manual detach. This is wrong. It should
open consumer on first provider open or should close it on shutdown. I
decided not to touch gbde, so you need to ask phk@ or someone else to
fix it.

I also found a bug in g_bde_access() function:

	if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) {

I think it should be:

	if ((cp->acr + dr) == 1 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) {

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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