zfs discuss - May 2009 - changing zpool disk names

All,

IHAC asking the following question..



I am dealing with a 15K domain with the storage disks residing on an EMC 
CX700 CLARiiON SAN.  When I created the ZPOOL, I only had the disk names 
themselves.  We are using PowerPath and Operations support now wants me 
to use the emcpower device names, instead of the actual disk names.
My questions are: 1. Is there a best practices for switching the names 
of the devices in the ZPOOL without destroying the data already 
contained in the ZFS File system?

2.  If so, I will need a procedure to do that.

3.  If not, What is your recommendation?

-- 
Peter Wilk

On Thu, 14 May 2009, Peter Wilk wrote:
> I am dealing with a 15K domain with the storage disks residing on an EMC 
> CX700 CLARiiON SAN.  When I created the ZPOOL, I only had the disk names 
> themselves.  We are using PowerPath and Operations support now wants me to 
> use the emcpower device names, instead of the actual disk names.
> My questions are: 1. Is there a best practices for switching the names of
the
> devices in the ZPOOL without destroying the data already contained in the
ZFS
> File system?
Provided that you have a way to block the devices you don''t want used, 
I think that this should be a simple matter of ''zpool export''
followed
by ''zpool import''.  Zpool import will scan the available
devices
looking for importable pools.  According to the documentation for 
''zpool import'' a numeric identifier may be used to select a
pool to
import.  I don''t know if this allows you to select between sets of 
devices leading to the same pool.  If the devices are in different 
/dev directories, then you can specify which directory of devices to 
use with the -d option.

Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Hi,

the simplest way, export & import are your friends !

$ *zpool status -v*

  pool: oldpool
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        oldpool     ONLINE       0     0     0
          c0d1      ONLINE       0     0     0
          c1d0      ONLINE       0     0     0
          c1d1      ONLINE       0     0     0


Now just $ *zpool export oldpool* and import with the new name $ *zpool 
import oldpool newpool*
every device in the pool is transfered to the new pool, no need of -d.

$ *zpool status -v*

  pool: newpool
 state: ONLINE
 scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        newpool     ONLINE       0     0     0
          c0d1      ONLINE       0     0     0
          c1d0      ONLINE       0     0     0
          c1d1      ONLINE       0     0     0

errors: No known data errors

 
kind regards,
Moutacim

Bob Friesenhahn schrieb:
> On Thu, 14 May 2009, Peter Wilk wrote:
>> I am dealing with a 15K domain with the storage disks residing on an 
>> EMC CX700 CLARiiON SAN.  When I created the ZPOOL, I only had the 
>> disk names themselves.  We are using PowerPath and Operations support 
>> now wants me to use the emcpower device names, instead of the actual 
>> disk names.
>> My questions are: 1. Is there a best practices for switching the 
>> names of the devices in the ZPOOL without destroying the data already 
>> contained in the ZFS File system?
>
> Provided that you have a way to block the devices you don''t want
used,
> I think that this should be a simple matter of ''zpool
export'' followed
> by ''zpool import''.  Zpool import will scan the available
devices
> looking for importable pools.  According to the documentation for 
> ''zpool import'' a numeric identifier may be used to select
a pool to
> import.  I don''t know if this allows you to select between sets of
> devices leading to the same pool.  If the devices are in different 
> /dev directories, then you can specify which directory of devices to 
> use with the -d option.
>
> Bob
> -- 
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, 
> http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

-- 
	

Moutacim LACHHAB
Service Engineer
Software Technical Services Center Sun Microsystems Inc.
Email moutacim.lachhab at Sun.COM <mailto:moutacim.lachhab at sun.com>
+33(0)134030594 x31457
For knowledge and support: http://sunsolve.sun.com