zfs discuss - Jul 2011 - Adding mirrors to an existing zfs-pool

G''Day,

- zfs pool with 4 disks (from Clariion A)
- must migrate to Clariion B (so I created 4 disks with the same size,
  avaiable for the zfs)

The zfs pool has no mirrors, my idea was to add the new 4 disks from
the Clariion B to the 4 disks which are still in the pool - and later
remove the original 4 disks.

I only found in all example how to create a new pool with mirrors
but no example how to add to a pool without mirrors a mirror disk
for each "disk" in the pool.

- is it possible to add disks to each disk in the pool (they have different
  sizes, so I have exact add the correct disks form Clariion B to the 
  original disk from Clariion B)
- can I later "remove" the disks from the Clariion A, pool is intact,
user
  can work with the pool 


??

Sorry for the beginner questions....

Tnx for help
-- 
This message posted from opensolaris.org

Bernd W. Hennig wrote:
> G''Day,
>
> - zfs pool with 4 disks (from Clariion A)
> - must migrate to Clariion B (so I created 4 disks with the same size,
>   avaiable for the zfs)
>
> The zfs pool has no mirrors, my idea was to add the new 4 disks from
> the Clariion B to the 4 disks which are still in the pool - and later
> remove the original 4 disks.
>
> I only found in all example how to create a new pool with mirrors
> but no example how to add to a pool without mirrors a mirror disk
> for each "disk" in the pool.
>
> - is it possible to add disks to each disk in the pool (they have different
>   sizes, so I have exact add the correct disks form Clariion B to the 
>   original disk from Clariion B)
> - can I later "remove" the disks from the Clariion A, pool is
intact, user
>   can work with the pool
>   
Depends on a few things...

What OS are you running, and what release/update or build?

What''s the RAID layout of your pool "zpool status"?

-- 
Andrew Gabriel

Hi
It is better just ceate new ool in array 8
Then use cpio ro copy the data

On 7/26/11, Bernd W. Hennig <consulting at hennig-consulting.com>
wrote:
> G''Day,
>
> - zfs pool with 4 disks (from Clariion A)
> - must migrate to Clariion B (so I created 4 disks with the same size,
>   avaiable for the zfs)
>
> The zfs pool has no mirrors, my idea was to add the new 4 disks from
> the Clariion B to the 4 disks which are still in the pool - and later
> remove the original 4 disks.
>
> I only found in all example how to create a new pool with mirrors
> but no example how to add to a pool without mirrors a mirror disk
> for each "disk" in the pool.
>
> - is it possible to add disks to each disk in the pool (they have different
>   sizes, so I have exact add the correct disks form Clariion B to the
>   original disk from Clariion B)
> - can I later "remove" the disks from the Clariion A, pool is
intact, user
>   can work with the pool
>
>
> ??
>
> Sorry for the beginner questions....
>
> Tnx for help
> --
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>
-- 
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Hung-Sheng Tsao, Ph.D. <laotsao at gmail.com>
laotsao at gmail.com
http://laotsao.wordpress.com
cell:9734950840
gvoice:8623970640

On Tue, Jul 26, 2011 at 1:33 PM, Bernd W. Hennig
<consulting at hennig-consulting.com> wrote:
> G''Day,
>
> - zfs pool with 4 disks (from Clariion A)
> - must migrate to Clariion B (so I created 4 disks with the same size,
> ?avaiable for the zfs)
>
> The zfs pool has no mirrors, my idea was to add the new 4 disks from
> the Clariion B to the 4 disks which are still in the pool - and later
> remove the original 4 disks.
>
> I only found in all example how to create a new pool with mirrors
> but no example how to add to a pool without mirrors a mirror disk
> for each "disk" in the pool.
>
> - is it possible to add disks to each disk in the pool (they have different
> ?sizes, so I have exact add the correct disks form Clariion B to the
> ?original disk from Clariion B)
from "man zpool"

       zpool attach [-f] pool device new_device

           Attaches new_device to an existing zpool device. The
existing device cannot be part of a raidz configuration. If device is
not currently  part
           of  a  mirrored  configuration, device automatically
transforms into a two-way mirror of device and new_device. If device
is part of a two-way
           mirror, attaching new_device creates a three-way mirror,
and so on. In either case, new_device begins to resilver immediately.

           -f    Forces use of new_device, even if its appears to be
in use. Not all devices can be overridden in this manner.
> - can I later "remove" the disks from the Clariion A, pool is
intact, user
> ?can work with the pool
       zpool detach pool device

           Detaches device from a mirror. The operation is refused if
there are no other valid replicas of the data.



If you''re using raidz, you can''t use zpool attach. Your best
bet in
this case is zpool replace.

       zpool replace [-f] pool old_device [new_device]

           Replaces old_device with new_device. This is equivalent to
attaching new_device, waiting for it to resilver, and then detaching
old_device.

           The size of new_device must be greater than or equal to the
minimum size of all the devices in a mirror or raidz configuration.

           new_device  is  required  if the pool is not redundant. If
new_device is not specified, it defaults to old_device. This form of
replacement is
           useful after an existing disk has failed and has been
physically replaced. In this case, the new disk may have the same /dev
path as  the  old
           device, even though it is actually a different disk. ZFS
recognizes this.

           -f    Forces use of new_device, even if its appears to be
in use. Not all devices can be overridden in this manner.


-- 
Fajar