zfs discuss - Oct 2010 - how to replace failed vdev on non redundant pool?

Hello,

I would like to know how to replace a failed vdev in a non redundant pool?

I am using fiber attached disks, and cannot simply place the disk back into
the machine, since it is virtual.

I have the latest kernel from sept 2010 that includes all of the new ZFS
upgrades.

Please, can you help me?
-
Cassandra
(609) 243-2413
Unix Administrator


"From a little spark may burst a mighty flame."
-Dante Alighieri
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If the pool is non-redundant and your vdev has failed, you have lost your data.
Just rebuild the pool, but consider a redundant configuration.

On Oct 15, 2010, at 3:26 PM, Cassandra Pugh wrote:
> Hello, 
> 
> I would like to know how to replace a failed vdev in a non redundant pool?
> 
> I am using fiber attached disks, and cannot simply place the disk back into
the machine, since it is virtual.
> 
> I have the latest kernel from sept 2010 that includes all of the new ZFS
upgrades.
> 
> Please, can you help me?
> -
> Cassandra
> (609) 243-2413
> Unix Administrator
> 
> 
> "From a little spark may burst a mighty flame."
> -Dante Alighieri 
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Scott Meilicke

> From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
> bounces at opensolaris.org] On Behalf Of Cassandra Pugh
> 
> I would like to know how to replace a failed vdev in a non redundant
> pool?
Non redundant ... Failed ... What do you expect?  This seems like a really
simple answer...  You can''t.  Unless perhaps I''ve
misunderstood the
question, or the question wasn''t asked right or something...

well, I was expecting/hoping that this command would work as expected:

zpool create testpool vdeva vdevb vdevc

*zpool replace testpool vdevc vdevd.*

# zpool status reports the disk is reslivered.

On a (non-mirror or raid) test pool i just created, this command works.
However, when the disk failed, all I/o was suspended, and I could not
replace it as above.
Even if I forced the command with -f.

If this were a raidz pool, would the zpool replace command even work?

-
Cassandra
(609) 243-2413
Unix Administrator


"From a little spark may burst a mighty flame."
-Dante Alighieri


On Fri, Oct 15, 2010 at 10:06 PM, Edward Ned Harvey <shill at
nedharvey.com>wrote:
> > From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
> > bounces at opensolaris.org] On Behalf Of Cassandra Pugh
> >
> > I would like to know how to replace a failed vdev in a non redundant
> > pool?
>
> Non redundant ... Failed ... What do you expect?  This seems like a really
> simple answer...  You can''t.  Unless perhaps I''ve
misunderstood the
> question, or the question wasn''t asked right or something...
>
>
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Am 20.10.10 17:53, schrieb Cassandra Pugh:
> well, I was expecting/hoping that this command would work as expected:
>
> zpool create testpool vdeva vdevb vdevc
>
> *zpool replace testpool vdevc vdevd.*
>
> # zpool status reports the disk is reslivered.
This obviously worked since the device you were about to replace was 
still accessible, which isn''t the case if a device inside a vdev fails 
and the vdev itself it not redundant.
>
> On a (non-mirror or raid) test pool i just created, this command works.
> However, when the disk failed, all I/o was suspended, and I could not 
> replace it as above.
> Even if I forced the command with -f.
>
> If this were a raidz pool, would the zpool replace command even work?
Yes this would work in raidz pool, since you have a redundancy of 1, so 
one device may go offline, before the vdev fails.


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Stephan Budach
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