zfs code - Dec 2006 - How does zfs mount at boot? How to let the system not to mount zfs?

Hi all,

I hope that I this is not the old thread. 

I''d like to know how zfs get mounted. After a pool is created, zfs got
mounted? Where is the record? Which file got written?

Traditional /etc/vfstab will mount all entries in that file. Where does Solaris
find zfs mount at boot?

How to I tell the system not to mount certain zfs at boot?

Thank you.
Giang
--
This messages posted from opensolaris.org

> After a pool is created, zfs got mounted?
yes, when you create a pool, the zfs filesystem within it is mounted.   
(Each pool will have a top level filesystem created for it when the  
pool is created, then you can use that and also create as many new  
filesystems within it as you like)

> Where does Solaris find zfs mount at boot?
ZFS keeps its record of what pools are on the system in /etc/zfs/ 
zpool.cache.  That''s the file that gets read at boot

> How to I tell the system not to mount certain zfs at boot?
you can set the ''canmount'' property to ''off''
for whatever filesystem
you do not want mounted:

Check out the zfs man pages for more filesystem properties stuff:
http://docs.sun.com/app/docs/doc/819-2240/6n4htdnpr?a=view

"
canmount=on | off

     If this property is set to ?off?, the file system cannot be  
mounted, and is ignored by ?zfs mount -a?. This is similar to setting  
the ?mountpoint? property to ?none?, except that the dataset still has  
a normal ?mountpoint? property which can be inherited. This allows  
datasets to be used solely as a mechanism to inherit properties. One  
use case is to have two logically separate datasets have the same  
mountpoint, so that the children of both datasets appear in the same  
directory, but may have different inherited characteristics. The  
default value is ?on?.

     This property is not inherited.
"


Noel

On Dec 14, 2006, at 6:06 AM, storage-disk wrote:
> Hi all,
>
> I hope that I this is not the old thread.
>
> I''d like to know how zfs get mounted. After a pool is created, zfs
> got mounted? Where is the record? Which file got written?
>
> Traditional /etc/vfstab will mount all entries in that file. Where  
> does Solaris find zfs mount at boot?
>
> How to I tell the system not to mount certain zfs at boot?
>
> Thank you.
> Giang
> --
> This messages posted from opensolaris.org
> _______________________________________________
> zfs-code mailing list
> zfs-code at opensolaris.org
> http://opensolaris.org/mailman/listinfo/zfs-code

No?l Dellofano wrote:
>> How to I tell the system not to mount certain zfs at boot?
> you can set the ''canmount'' property to
''off'' for whatever filesystem you
> do not want mounted:
Or if you don''t want anything mounted, ''zfs set
mountpoint=none
<poolname>''.  (the mountpoint property is inherited.)

--matt

On Thursday 14 December 2006 20:35, No?l Dellofano
wrote:
> > Where does Solaris find zfs mount at boot?
>
> ZFS keeps its record of what pools are on the system in /etc/zfs/
> zpool.cache.  That''s the file that gets read at boot
I''m also interested to know where in the code are the filesystems
mounted at
boot.

Is there some code that does it when the zfs module loads or does OpenSolaris 
simply call ''zfs mount -a'' as part of the boot process?

Hello Ricardo,

Friday, December 15, 2006, 12:45:42 AM, you wrote:

RC> On Thursday 14 December 2006 20:35, No?l Dellofano
wrote:
>> > Where does Solaris find zfs mount at boot?
>>
>> ZFS keeps its record of what pools are on the system in /etc/zfs/
>> zpool.cache.  That''s the file that gets read at boot
RC> I''m also interested to know where in the code are the
filesystems mounted at
RC> boot.

RC> Is there some code that does it when the zfs module loads or does
OpenSolaris
RC> simply call ''zfs mount -a'' as part of the boot process?

zfs mount -a is called from fs-local

-- 
Best regards,
 Robert                            mailto:rmilkowski at task.gda.pl
                                       http://milek.blogspot.com