zfs discuss - Jun 2007 - drive displayed multiple times

So I just imported an old zpool onto this new system.  The problem would be one
drive (c4d0) is showing up twice.  First it''s displayed as ONLINE, then
it''s displayed as "UNAVAIL".  This is obviously causing a
problem as the zpool now thinks it''s in a degraded state, even though
all drives are there, and all are online.

This pool should have 7 drives total, which it does, but for some reason c4d0 is
displayed twice.  Once as online (which it is), and once as unavail (which it is
not).



# zpool status
  pool: fserv
 state: DEGRADED
status: One or more devices could not be opened.  Sufficient replicas exist for
        the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using ''zpool
online''.
   see: http://www.sun.com/msg/ZFS-8000-D3
 scrub: resilver completed with 0 errors on Wed Jun 13 00:16:54 2007
config:

        NAME        STATE     READ WRITE CKSUM
        fserv       DEGRADED     0     0     0
          raidz1    DEGRADED     0     0     0
            c4d0    ONLINE       0     0     0
            c4d1    ONLINE       0     0     0
            c5d1    ONLINE       0     0     0
            c2t0d0  ONLINE       0     0     0
            c3t1d0  ONLINE       0     0     0
            c2t1d0  ONLINE       0     0     0
            c4d0    UNAVAIL      0     0     0  cannot open

errors: No known data errors
 
 
This message posted from opensolaris.org

Hi All,
   
  Is it possible to create a ZPool on SVM volumes ? What are the limitations for
this ?
   
  on a solaris machine, how many number of zpools we can create ? Is there any
limitation on number of zpools per system ?
   
  -Mastahn

       
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dudekula mastan wrote:
> Is it possible to create a ZPool on SVM volumes ? What are the 
> limitations for this ?
Not as far as I am aware. libdiskmgmt gets in the
way - it protects you.
> on a solaris machine, how many number of zpools we can create ? Is there 
> any limitation on number of zpools per system ?
for all practical purposes, it''s unlimited.


James C. McPherson
--
Solaris kernel software engineer, system admin and troubleshooter
               http://www.jmcp.homeunix.com/blog
Find me on LinkedIn @ http://www.linkedin.com/in/jamescmcpherson

On Tue, 12 Jun 2007, Tim Cook wrote:
> This pool should have 7 drives total, which it does, but for some reason
> c4d0 is displayed twice.  Once as online (which it is), and once as
> unavail (which it is not).
What''s the name of the 7th drive?  Did you take all the drives from the
old system and plug them into the new system, or are the drives still in
place where the zpool was originally created?


Regards,
markm

> dudekula mastan wrote:
> > Is it possible to create a ZPool on SVM volumes ? What are the 
> > limitations for this ?
> 
> Not as far as I am aware. libdiskmgmt gets in the
> way - it protects you.
Should be able to.  We''ve had some threads about ZFS on top of SVM.

http://www.opensolaris.org/jive/thread.jspa?messageID=103954


-- 
Darren Dunham                                           ddunham at taos.com
Senior Technical Consultant         TAOS            http://www.taos.com/
Got some Dr Pepper?                           San Francisco, CA bay area
         < This line left intentionally blank to confuse you. >

> dudekula mastan wrote:
>> Is it possible to create a ZPool on SVM volumes ? What are the
limitations
>> for this ?
>
> Not as far as I am aware. libdiskmgmt gets in the
> way - it protects you.
This is incorrect.  If you attempt to use the same underlying disks, then 
libdiskmgmt will protect you.

But if you use the SVM block volumes, you can certainly do this:
> 9:00 elpaso [~] {4:0}% zpool status riogrande
>   pool: riogrande
>  state: ONLINE
> status: The pool is formatted using an older on-disk format.  The pool can
>         still be used, but some features are unavailable.
> action: Upgrade the pool using ''zpool upgrade''.  Once
this is done, the
>         pool will no longer be accessible on older software versions.
>  scrub: none requested
> config:
>
>         NAME                    STATE     READ WRITE CKSUM
>         riogrande               ONLINE       0     0     0
>           /dev/md/gate/dsk/d50  ONLINE       0     0     0
>           /dev/md/gate/dsk/d51  ONLINE       0     0     0
>           /dev/md/gate/dsk/d52  ONLINE       0     0     0
>           /dev/md/gate/dsk/d53  ONLINE       0     0     0
>           /dev/md/gate/dsk/d54  ONLINE       0     0     0
>           /dev/md/gate/dsk/d55  ONLINE       0     0     0
> 
> errors: No known data errors
> 9:00 elpaso [~] {5:0}%
....in this example, the SVM volumes are part of a named diskset.  That is 
NOT required, and this will also work correctly on volumes from the local 
diskset.

The interaction of ZFS and SVM creates no new, interesting limitations, 
beyond those that pertain to ZFS or SVM in isolation.

As a practical measure, you should probably not be duplicating levels of 
striping or redundancy in both layers.

--Mark