mirroring two data disks (no system files on them)

[Christian Caron]

> +> 
> +> I tried adding /dev/mirror/gm0s1 to /etc/fstab, but it dies when loading...
> +> 
> +> Any hints?
> 
> Just to be sure: did you create file system on it?
> 

Sorry about the lack of details. I should have take more time to describe.

By following the guidelines, I indeed use sysinstall (fdisk and label) 
to create c partitions on ad2 and ad3 (I hope I did it right).

The error showing at boot time is:

====
Cannot find file system superblock
/dev/mirror/gm0s1c: CAN'T CHECK FILE SYSTEM.
/dev/mirror/gm0s1c: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
/dev/mirror/gm0s1c: CANNOT SEEK BLK: -1
/dev/mirror/gm0s1c: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
(...)
THE FOLLOWING FILE SYSTEM HAD AN UNEXPECTED INCONSISTENCY:
	ufs: /dev/mirror/gm0s1c (/mirror)
Automatic file system check failed; help!
Mar 29 18:28:15 init: /bin/sh on /etc/rc terminated abnormally, going to 
single user mode
Enter full pathname of shell or RETURN for /bin/sh:
====

Then I can mount /, /tmp, /var and /usr to remove tne entry from /etc/fstab:

/dev/mirror/gm0s1c	/mirror	ufs	rw	2	2

When I comment out this entry, I can boot normally, but I can't access 
the geom drive.

Here's the content when it boots ok:

ad2: 14669MB <WDC WD153BA/16.13M16> [29805/16/63] at ata1-master UDMA33
ad3: 14669MB <WDC WD153BA/16.13M16> [29805/16/63] at ata1-slave UDMA33
GEOM_MIRROR: Device gm0s1 created (id=522018943)
GEOM_MIRROR: Device gm0s1: provider ad2 detected.
GEOM_MIRROR: Device gm0s1: provider ad3 detected.
GEOM_MIRROR: Device gm0s1: provider ad3 activated.
GEOM_MIRROR: Device gm0s1: provider mirror/gm0s1 launched.
GEOM_MIRROR: Device gm0s1: rebuilding provider ad2.
GEOM_MIRROR: Device gm0s1: rebuilding provider ad2 finished.
GEOM_MIRROR: Device gm0s1: provider ad2 activated.

 > ls -l /dev/ad2* /dev/ad3*
crw-r----- 1 root operator 4, 13 Mar 30 00:00 /dev/ad2
crw-r----- 1 root operator 4, 30 Mar 30 00:00 /dev/ad2a
crw-r----- 1 root operator 4, 31 Mar 30 00:00 /dev/ad2c
crw-r----- 1 root operator 4, 14 Mar 30 00:00 /dev/ad3
crw-r----- 1 root operator 4, 19 Mar 30 00:00 /dev/ad3a
crw-r----- 1 root operator 4, 20 Mar 30 00:00 /dev/ad3c

 > ls -l /dev/mirror
crw-r----- 1 root operator 4, 21 Mar 30 00:00 gm0s1
crw-r----- 1 root operator 4, 28 Mar 30 00:00 gm0s1a
crw-r----- 1 root operator 4, 29 Mar 30 00:00 gm0s1c

I think that's all the details I have...

Christian