On Thu, Jul 02, 2009 at 03:48:41PM +0200, Wojciech Puchar wrote:
> >>>
> >>> # gmirror label -vb round-robin root /dev/da0p2
> >>> gmirror: Can't store metadata on /dev/da0p2: Operation not permitted.
> >> isn't that partition accessed by other process or mounted?
> >
> > should it not be mounted?
> yes it should not, no matter what architecture.

ok, thank you

So how can I gmirror root partition? I can't unmount it, I think.
Perhaps I need to use a single-user mode?


Following is a gpart/gmirror report - some success and problems.

I did a fresh FBSD current install on ia64 on directly attached scsi, da0.

# gpart show
=>      34  35566411  da0  GPT  (17G)
        34    819200    1  efi  (400M)
    819234   1048576    2  freebsd-ufs  (512M)
   1867810   4194304    3  freebsd-swap  (2.0G)
   6062114   2097152    4  freebsd-ufs  (1.0G)
   8159266   2097152    5  freebsd-ufs  (1.0G)
  10256418  25310027    6  freebsd-ufs  (12G)

#

What I want is to mirror the whole of the boot disk to da1, which
is identical to da0, but following Marcel's advice, will apply
gmirror per partition.

So starting with efi partition:

First I create GPT scheme on da1

# gpart create -s gpt da1
da1 created
# gpart show da1
=>      34  35566411  da1  GPT  (17G)
        34  35566411       - free -  (17G)

#

then I create EFI partition of the same size as on the boot disk, da0.

# gpart add -b 34 -s 819200 -t efi da1
da1p1 added
# gpart show da1
=>      34  35566411  da1  GPT  (17G)
        34    819200    1  efi  (400M)
    819234  34747211       - free -  (17G)

#

then I umount /efi so that I can create gmirror label on da0p1.

# umount /efi
# gmirror label -vb round-robin efi /dev/da0p1
Metadata value stored on /dev/da0p1.
Done.
#

Checking gmirror

# gmirror status
      Name    Status  Components
mirror/efi  COMPLETE  da0p1
#

and another check

# gmirror list
Geom name: efi
State: COMPLETE
Components: 1
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 1
ID: 3904698645
Providers:
1. Name: mirror/efi
   Mediasize: 419429888 (400M)
   Sectorsize: 512
   Mode: r0w0e0
Consumers:
1. Name: da0p1
   Mediasize: 419430400 (400M)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: NONE
   GenID: 0
   SyncID: 1
   ID: 1288665799

#

now insert a spare partition, da1p1, into the mirror

# gmirror insert efi /dev/da1p1

status looks fine

# gmirror status
      Name    Status  Components
mirror/efi  DEGRADED  da0p1
                      da1p1 (44%)
# gmirror status
      Name    Status  Components
mirror/efi  DEGRADED  da0p1
                      da1p1 (87%)
# gmirror status
      Name    Status  Components
mirror/efi  COMPLETE  da0p1
                      da1p1
#

and another check

# gmirror list
Geom name: efi
State: COMPLETE
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 1
ID: 3904698645
Providers:
1. Name: mirror/efi
   Mediasize: 419429888 (400M)
   Sectorsize: 512
   Mode: r0w0e0
Consumers:
1. Name: da0p1
   Mediasize: 419430400 (400M)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: NONE
   GenID: 0
   SyncID: 1
   ID: 1288665799
2. Name: da1p1
   Mediasize: 419430400 (400M)
   Sectorsize: 512
   Mode: r1w1e1
   State: ACTIVE
   Priority: 0
   Flags: NONE
   GenID: 0
   SyncID: 1
   ID: 1724596009

#

So far, so good.

Now, I don't need to create the filesystem on the mirror, because EFI
was copied from da0p1 to da1p1.

So, I try to mount /dev/mirror/efi

# mount -t msdosfs /dev/mirror/efi /mnt
# df
Filesystem      1K-blocks   Used    Avail Capacity  Mounted on
/dev/da0p2         507630  35904   431116     8%    /
devfs                   1      1        0   100%    /dev
/dev/da0p5        1012974     12   931926     0%    /tmp
/dev/da0p6       12252370 252608 11019574     2%    /usr
/dev/da0p4        1012974    242   931696     0%    /var
/dev/mirror/efi    409504 163264   246240    40%    /mnt
#

again seems ok

so I proceed to modify /etc/fstab and change da0p1 into mirror/efi

# cat /etc/fstab
# Device        Mountpoint      FStype  Options         Dump    Pass#
/dev/da0p3      none            swap    sw              0       0
/dev/da0p2      /               ufs     rw              1       1
/dev/mirror/efi /efi            msdosfs rw              0       0
^^^^^^^^^^^^^^^
/dev/da0p5      /tmp            ufs     rw              2       2
/dev/da0p6      /usr            ufs     rw              2       2
/dev/da0p4      /var            ufs     rw              2       2
/dev/acd0       /cdrom          cd9660  ro,noauto       0       0
#

now I can try to just mount /efi

# umount /mnt
# mount /efi
# df
Filesystem      1K-blocks   Used    Avail Capacity  Mounted on
/dev/da0p2         507630  35904   431116     8%    /
devfs                   1      1        0   100%    /dev
/dev/da0p5        1012974     12   931926     0%    /tmp
/dev/da0p6       12252370 252608 11019574     2%    /usr
/dev/da0p4        1012974    242   931696     0%    /var
/dev/mirror/efi    409504 163264   246240    40%    /efi
#

good, working!

now to mirror root partition.

My problem is that root is mounted and cannot (?) be unmounted, unlike /efi,
on the live system.

# gpart add -b 819234 -s 1048576 -t freebsd-ufs da1
da1p2 added
#

# gmirror label -vb round-robin root /dev/da0p2
gmirror: Can't store metadata on /dev/da0p2: Operation not permitted.
#

If I create gmirror on da1, the spare disk:

# gmirror label -vb round-robin root /dev/da1p2
Metadata value stored on /dev/da0p1.
Done.
#

so that

# gmirror status
       Name    Status  Components
 mirror/efi  COMPLETE  da0p1
                       da1p1
mirror/root  COMPLETE  da1p2

#


then I still cannot insert da0p2


# gmirror insert root da0p2
gmirror: Cannot access provider da0p2.
#

So how can I gmirror root partion on a live system?

Also, if gmirror overwrites the last sector in the partition,
then gmirror per partition cannot be used for /usr, because
secondary GPT is stored in the last sector of /usr. Isn't it?

many thanks
 
-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 928 8233 
Fax: +44 (0)117 929 4423
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