zfs discuss - Sep 2010 - create mirror copy of existing zfs stack

Hi,

I have a mirror pool tank having two devices underneath. Created in this way

#zpool create tank mirror  c3t500507630E020CEAd1  c3t500507630E020CEAd0  

Created file system tank/home
#zfs create tank/home

Created another file system tank/home
#zfs create tank/home/sridhar
After that I have created files and directories under tank/home and
tank/home/sridhar.

Now I detached 2nd device i.e c3t500507630E020CEAd0

Since the above device is part of mirror pool, my guess it will have copy of
data which is there in other device till detach and will have metadata with same
pool name and file systems created.

Question is is there any way I can create a new stack with renamed stack by
providing the new pool name to this detached device and should access the same
data for the c3t500507630E020CEAd0 which was created when it was in mirrored
pool under tank. ?

Thanks & Regards,
sridhar.
-- 
This message posted from opensolaris.org

On Mon, Sep 20, 2010 at 11:03 AM, sridhar surampudi
<toyours_sridhar at yahoo.co.in> wrote:
> I have a mirror pool tank having two devices underneath. Created in this
way
>
> #zpool create tank mirror ?c3t500507630E020CEAd1 ?c3t500507630E020CEAd0
>
> Created file system tank/home
> #zfs create tank/home
>
> Created another file system tank/home
> #zfs create tank/home/sridhar
> After that I have created files and directories under tank/home and
tank/home/sridhar.
>
> Now I detached 2nd device i.e c3t500507630E020CEAd0
>
> Since the above device is part of mirror pool, my guess it will have copy
of data which is there in other device till detach and will have metadata with
same pool name and file systems created.
>
> Question is is there any way I can create a new stack with renamed stack by
providing the new pool name to this detached device and should access the same
data for the c3t500507630E020CEAd0 which was created when it was in mirrored
pool under tank. ?
If your ZFS version is new enough, there is a "zpool split" command
you can use, for just this purpose.  It splits a mirror vdev in half
and assigns a new pool name to the drive you are removing.  You can
then use that drive to create a new pool, thus creating a duplicate of
the original pool.


-- 
Freddie Cash
fjwcash at gmail.com

Thank you for your quick reply.

When I run below command it is showing.
bash-3.00# zpool upgrade
This system is currently running ZFS pool version 15.

All pools are formatted using this version.


How can I upgrade to new zpool and zfs versions so that I can have zpool split
capabilities ?
I am bit new to Soaris and zfs.
Could you please help how can I upgrade ?

Thanks & Regards,
sridhar.
-- 
This message posted from opensolaris.org

On 09/21/10 06:52 AM, sridhar surampudi wrote:
> Thank you for your quick reply.
>
> When I run below command it is showing.
> bash-3.00# zpool upgrade
> This system is currently running ZFS pool version 15.
>
> All pools are formatted using this version.
>
>
> How can I upgrade to new zpool and zfs versions so that I can have zpool
split capabilities ?
> I am bit new to Soaris and zfs.
> Could you please help how can I upgrade ?
>
>    
What operating system version are you running?

-- 
Ian.

I am using solaris 10 9/10 SARC x64 version.

Following are output of release file and uname -a respectively.

bash-3.00# cat /etc/release 
                      Solaris 10 10/09 s10s_u8wos_08a SPARC
           Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                           Assembled 16 September 2009
bash-3.00# uname -a
SunOS oigtsol12 5.10 Generic_141444-09 sun4u sparc SUNW,Sun-Fire-V440

I think zpool split is available with build 135. Not sure which build signifies
of the version which I am using.

I have also tried zpool upgrade -a but didn''t find any difference.

Thanks & Regards,
sridhar.
-- 
This message posted from opensolaris.org

In your first sentence, you indicate you are using Update 9 (Sol 10 9/10).

Where you have cat''ed out your /etc/release file, this shows that you 
are using Update 8, which predates the zpool split feature.

I am not certain if you can patch an update 8 system to current levels, 
and get the features included in update 9.  It is certainly a 
possibility, as new zfs features have been included in past patches.

Another indicator to me that you are not on Update 9 is your kernel 
revision.  your uname output indicates kernel 141444-09.  Update 9 ships 
with kernel rev 142909-17.

If you need Update 9 to get this feature, you should be able to go to 
Oracle''s download site.

Also, regardless of how you upgrade/Live Update/etc, be aware of the new 
auto reg issue.

Hope this helps,

Jerry

--

Linux infrequently disappoints but when it does so, it disappoints so 
brutally that you momentarily forget how badly Windows burned you.


On 09/21/10 00:47, sridhar surampudi wrote:
> I am using solaris 10 9/10 SARC x64 version.
>
> Following are output of release file and uname -a respectively.
>
> bash-3.00# cat /etc/release
>                        Solaris 10 10/09 s10s_u8wos_08a SPARC
>             Copyright 2009 Sun Microsystems, Inc.  All Rights Reserved.
>                          Use is subject to license terms.
>                             Assembled 16 September 2009
> bash-3.00# uname -a
> SunOS oigtsol12 5.10 Generic_141444-09 sun4u sparc SUNW,Sun-Fire-V440
>
> I think zpool split is available with build 135. Not sure which build
signifies of the version which I am using.
>
> I have also tried zpool upgrade -a but didn''t find any difference.
>
> Thanks&  Regards,
> sridhar.