gmirror weird behaviour

[Mario Pranjic]

Hi!

I have a system with 2 250 GB disks in mirror:
[root at haerbe ~]# gmirror status
      Name    Status  Components
mirror/gmo  COMPLETE  ad0
                      ad2


system info:
FreeBSD haerbe.net 6.2-RELEASE-p7 FreeBSD 6.2-RELEASE-p7 #0: Wed Sep  5
06:24:11 CEST 2007     root at haerbe.net:/usr/obj/usr/src/sys/HAERBE  i386


At some point ad0 disk was detached from the system:
Oct 25 06:43:10 haerbe ad0: FAILURE - device detached
Oct 25 06:43:10 haerbe subdisk0: detached
Oct 25 06:43:10 haerbe ad0: detached
Oct 25 06:43:10 haerbe GEOM_MIRROR: Device gmo: provider ad0 disconnected.
Oct 25 06:43:10 haerbe g_vfs_done():mirror/gmos2e[READ(offset=10598187008,
length=16384)]error = 6
Oct 25 06:43:10 haerbe g_vfs_done():mirror/gmos2e[READ(offset=30252744704,
length=16384)]error = 6

Mirror status:
[root at haerbe /www/_backups/hrbwiki/2007-10-22]# gmirror status
      Name    Status  Components
mirror/gmo  DEGRADED  ad2
[root at haerbe /www/_backups/hrbwiki/2007-10-22]# gmirror list
Geom name: gmo
State: DEGRADED
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 2
ID: 3221909623
Providers:
1. Name: mirror/gmo
   Mediasize: 250059349504 (233G)
   Sectorsize: 512
   Mode: r8w8e10
Consumers:
1. Name: ad2
   Mediasize: 250059350016 (233G)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: NONE
   GenID: 0
   SyncID: 2
   ID: 1951693847


I cleaned the mirror:
[root at haerbe]# gmirror forget gmo

[root at haerbe ~]# gmirror status
      Name    Status  Components
mirror/gmo  COMPLETE  ad2


After reboot the system is aware of both disks:
ad0: 238475MB <Seagate ST3250820A 3.AAE> at ata0-master UDMA100
ad2: 238475MB <Seagate ST3250820A 3.AAE> at ata1-master UDMA100


but after that:
GEOM_MIRROR: Cannot add disk ad2 to gmo (error=22).
Root mount waiting for: GMIRROR
Root mount waiting for: GMIRROR
Root mount waiting for: GMIRROR
GEOM_MIRROR: Force device gmo start due to timeout.
GEOM_MIRROR: Device gmo: provider ad0 activated.
GEOM_MIRROR: Device gmo: provider mirror/gmo launched.

And the system rebooted with ad0 in mirror and not ad2!
[root at haerbe ~]# gmirror list
Geom name: gmo
State: DEGRADED
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 2
ID: 3221909623
Providers:
1. Name: mirror/gmo
   Mediasize: 250059349504 (233G)
   Sectorsize: 512
   Mode: r8w8e10
Consumers:
1. Name: ad0
   Mediasize: 250059350016 (233G)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: DIRTY
   GenID: 0
   SyncID: 2
   ID: 2195860303

[root at haerbe ~]# gmirror status
      Name    Status  Components
mirror/gmo  DEGRADED  ad0


Now I synced mirror again successfuly but this is weird. It should not be
happening.

Any ideas what is going on?

Thnx!

-- 
Mario.
http://keeper.sharanet.org/
http://keeper.haerbe.net/
http://keeper.nymphomatic.org/