zfs root is not mounted automatically

Bruno Damour freebsd.ruomad at free.fr
Thu May 17 06:53:02 UTC 2007


Bruno Damour wrote:
> Hello,
> I have successfullty moved my root to zfs (some work, though) 
> following Pawel instruction.
> Anyway, it still refuses to boot without asking root device from cmd 
> line :
>
> acd0: DVDR <DVDRW IDE 16X/VER A091> at ata0-master UDMA66
> ad10: 238475MB <Seagate ST3250624AS 3.AAE> at ata5-master SATA150
> ad12: 305245MB <External Disk 0 RGL10364> at ata6-master SATA150
> pcm0: <HDA Codec: Realtek ALC882>
> pcm0: <HDA Driver Revision: 20070505_0044>
> WARNING: ZFS is considered to be an experimental feature in FreeBSD.
> SMP: AP CPU #1 Launched!
> Trying to mount root from zfs:system
>
> Manual root filesystem specification:
>  <fstype>:<device>  Mount <device> using filesystem <fstype>
>                       eg. ufs:da0s1a
>  ?                  List valid disk boot devices
>  <empty line>       Abort manual input
>
> mountroot> ZFS filesystem version 6
> ZFS storage pool version 6
> zfs:system
> Trying to mount root from zfs:system
> fuse4bsd: version 0.3.0, FUSE ABI 7.8
>
> It first fails to mount my zfs:system
> I get the mountroot cmd line, and if I type zfs:system, boot resumes 
> and completes allright.
>
> Any idea of how to get rid of this ?
>
> vil1 ~ # uname -a
> FreeBSD vil1.ruomad.net 7.0-CURRENT FreeBSD 7.0-CURRENT #2: Sat May 12 
> 08:10:27 CEST 2007     root at vil1.ruomad.net:/usr/obj/usr/src/sys/VIL1  
> amd64
>
> vil1 ~ # zpool list
> NAME                    SIZE    USED   AVAIL    CAP  HEALTH     ALTROOT
> data                    298G   64.3G    234G    21%  ONLINE     -
> system                 74.5G   10.3G   64.2G    13%  ONLINE     -
>
> vil1 ~ # df
> Filesystem       1K-blocks     Used     Avail Capacity  Mounted on
> system            66604544   497024  66107520     1%    /
> devfs                    1        1         0   100%    /dev
> /dev/ad10s2a        507630   418978     48042    90%    /bootdisk
> system/tmp        66110464     2944  66107520     0%    /tmp
> system/usr        70144768  4037248  66107520     6%    /usr
> system/usr/local  68888704  2781184  66107520     4%    /usr/local
> system/var        67045760   938240  66107520     1%    /var
> /dev/ad10s1      122093968 35128468  86965500    29%    /mnt/win
> data             307590016 67431168 240158848    22%    /data
>
> Thanks in advance
>
> Bruno
>
>
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Well, I discovered that booting in verbose mode, the root gets mounted 
without problem.
THat seems to confirm that the problem comes from the pool not being 
fully up when the kernel first tries to mount it (in normal mode)
I guess in verbose mode the timing gets slightly different so that the 
pool has time to come up.
- in normal mode the message :
     ZFS filesystem version 6
     ZFS storage pool version 6
is printed AFTER the
Trying to mount root from zfs:system

whereas in verbose mode I get the contrary.

normal mode :

WARNING: ZFS is considered to be an experimental feature in FreeBSD.
SMP: AP CPU #1 Launched!
Trying to mount root from zfs:system

Manual root filesystem specification:
  <fstype>:<device>  Mount <device> using filesystem <fstype>
                       eg. ufs:da0s1a
  ?                  List valid disk boot devices
  <empty line>       Abort manual input

mountroot> ZFS filesystem version 6
ZFS storage pool version 6

verbose mode :

WARNING: ZFS is considered to be an experimental feature in FreeBSD.
SMP: AP CPU #1 Launched!
cpu1 AP:
     ID: 0x01000000   VER: 0x00050014 LDR: 0x00000000 DFR: 0xffffffff
  lint0: 0x00010700 lint1: 0x00000400 TPR: 0x00000000 SVR: 0x000001ff
  timer: 0x000200ef therm: 0x00010000 err: 0x00010000 pcm: 0x00010000
ioapic0: Assigning ISA IRQ 1 to local APIC 0
ioapic0: Assigning ISA IRQ 4 to local APIC 1
ioapic0: Assigning ISA IRQ 6 to local APIC 0
ioapic0: Assigning ISA IRQ 9 to local APIC 1
ioapic0: Assigning ISA IRQ 14 to local APIC 0
ioapic0: Assigning ISA IRQ 15 to local APIC 1
ioapic0: Assigning PCI IRQ 17 to local APIC 0
ioapic0: Assigning PCI IRQ 18 to local APIC 1
ioapic0: Assigning PCI IRQ 19 to local APIC 0
ioapic0: Assigning PCI IRQ 20 to local APIC 1
ioapic0: Assigning PCI IRQ 21 to local APIC 0
ioapic0: Assigning PCI IRQ 23 to local APIC 1
msi: Assigning MSI IRQ 256 to local APIC 0
msi: Assigning MSI IRQ 258 to local APIC 1
ZFS filesystem version 6
ZFS storage pool version 6
Trying to mount root from zfs:system
start_init: trying /sbin/init
Linux ELF exec handler installed


Anyone has an idea on how to get the normal mode to work automatically 
(not that I cannot live with verbose dmesg, but...)

Bruno


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