Hi Kugutsumen,
Not sure abt the bugs, I follow instruction at
http://www.opensolaris.org/os/community/zfs/boot/zfsboot-manual
and create separate /usr, /opt and /var filesystem.
Here is the vfstab:
#device device mount FS fsck mount
mount
#to mount to fsck point type pass at boot
options
#
fd - /dev/fd fd - no -
/proc - /proc proc - no -
/dev/dsk/c0d0s1 - - swap - no -
/devices - /devices devfs - no -
sharefs - /etc/dfs/sharetab sharefs - no -
ctfs - /system/contract ctfs - no -
objfs - /system/object objfs - no -
swap - /tmp tmpfs - yes -
/dev/dsk/c0d0p0:1 /dev/rdsk/c0d0p0:1 /windows/C pcfs
2 yes
-
/dev/dsk/c0d0p0:2 /dev/rdsk/c0d0p0:2 /windows/D pcfs
2 yes
-
/dev/dsk/c0d0p0:3 /dev/rdsk/c0d0p0:3 /windows/E pcfs
2 yes
-
rootpool/rootfs - / zfs - no -
rootpool/rootfs/usr - /usr zfs - no -
rootpool/rootfs/var - /var zfs - no -
rootpool/rootfs/opt - /opt zfs - yes -
The reason why I separate /usr, /opt, /var because I want to compress them:
bash-3.00$ zfs get compressratio rootpool/rootfs/usr
NAME PROPERTY VALUE SOURCE
rootpool/rootfs/usr compressratio 1.65x -
bash-3.00$ zfs get compressratio rootpool/rootfs/var
NAME PROPERTY VALUE SOURCE
rootpool/rootfs/var compressratio 2.10x -
bash-3.00$ zfs get compressratio rootpool/rootfs/opt
NAME PROPERTY VALUE SOURCE
rootpool/rootfs/opt compressratio 1.66x
My entire bootdisk only need 2.5GB (entire distribution):
bash-3.00$ zfs list rootpool/rootfs
NAME USED AVAIL REFER MOUNTPOINT
rootpool/rootfs 2.58G 1.85G 351M legacy
To be able to rollback you need to create another boot environment using
snapshot and clone. I named the new zfs root filesystem as rootpool/tx
(planned to install Solaris trusted extension on the new boot environment).
bash-3.00$ zfs list -r rootpool/tx
NAME USED AVAIL REFER MOUNTPOINT
rootpool/tx 57.2M 1.85G 343M legacy
rootpool/tx/opt 30K 1.85G 230M legacy
rootpool/tx/usr 198K 1.85G 1.79G legacy
rootpool/tx/var 644K 1.85G 68.1M legacy
If you want to rollback you need to boot to the clone BE then rollback.
Rgds,
Andre W.
Kugutsumen wrote:
Please do share how you managed to have a separate ZFS /usr since
b64; there are dependencies to /usr and they are not documented.
-kv doesn't help too. I tried added /usr/lib/libdisk* to a /usr/lib
dir on the root partition and failed.
Jurgen also pointed that there are two related bugs already filed:
Bug ID 6570056
Synopsis /sbin/zpool should not link to files in /usr/lib
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6570056
Bug ID 6494840
Synopsis libzfs should dlopen libiscsitgt rather than linking to it
http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6494840
I can do a snapshot on bootroot too ... after I tried to do a
rollback from failsafe I couldn't boot anymore, probably because
there was no straightforward way to rebuild the boot archive.
Regarding compression, if I am not mistaken, grub cannot access files
that are compressed.
Regards,
K.
On 05/10/2007, at 5:55 AM, Andre Wenas wrote:
Hi,
Using bootroot I can do seperate /usr filesystem since b64. I can
also do snapshot, clone and compression.
Rgds,
Andre W.
Kugutsumen wrote:
Lori Alt told me that mountrount was a temporary hack until grub
could boot zfs natively.
Since build 62, mountroot support was dropped and I am not
convinced that this is a mistake.
Let's compare the two:
Mountroot:
Pros:
* can have root partition on raid-z: YES
* can have root partition on zfs stripping mirror: YES
* can have usr partition on separate ZFS partition with build
< 72 : YES
* can snapshot and rollback root partition: YES
* can use copies on root partition on a single root disk (e.g.
a laptop ): YES
* can use compression on root partition: YES
Cons:
* grub native support: NO (if you use raid-z or stripping
mirror, you will need to have a small UFS partition
to bootstrap the system, but you can use a small usb stick
for that purpose.)
New and "improved" *sigh* bootroot scheme:
Pros:
* grub native support: YES
Cons:
* can have root partition on raid-z: NO
* can have root partition on zfs stripping mirror: NO
* can use copies on root partition on a single root disk (e.g.
a laptop ): NO
* can have usr partition on separate ZFS partition with build
< 72 : NO
* can snapshot and rollback root partition: NO
* can use compression on root partition: NO
* No backward compatibility with zfs mountroot.
Why did we completely drop support for the old mountroot approach
which is so much more flexible?
Kugutsumen
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