zfs discuss - Jul 2010 - spreading data after adding devices to pool

I use ZFS (on FreeBSD) for my home NAS. I started on 4 drives then added 4 and
have now added another 4, bringing the total up to 12 drives on 3 raidzs in 1
pool.

I was just wondering if there was any advantage or disadvantage to spreading the
data across the 3 raidz, as two are currently full and one is completely empty.

If it would improve performance to spread the data, is there any easy way to do
it?
-- 
This message posted from opensolaris.org

You could move the data elsewhere using zfs send and recv, destroy the
original datasets and then recreate them.  This would stripe the data across
the vdevs.  Of course, when BP-rewrite becomes available it should be
possible to simply redistribute blocks amongst the various vdevs without
having to go through destroying/creating.

On Fri, Jul 9, 2010 at 6:57 AM, George Helyar <ghelyar at gmail.com>
wrote:
> I use ZFS (on FreeBSD) for my home NAS. I started on 4 drives then added 4
> and have now added another 4, bringing the total up to 12 drives on 3
raidzs
> in 1 pool.
>
> I was just wondering if there was any advantage or disadvantage to
> spreading the data across the 3 raidz, as two are currently full and one is
> completely empty.
>
> If it would improve performance to spread the data, is there any easy way
> to do it?
> --
> This message posted from opensolaris.org
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
>


-- 
Matt Urbanowski
Graduate Student
5-51 Medical Sciences Building
Dept. Of Cell Biology
University of Alberta
Edmonton, Alberta, Canada
T6G 2H7
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Anyone knows where in the pipeline BP rewrite is, or how long this pipeline is? 




You could move the data elsewhere using zfs send and recv, destroy the original
datasets and then recreate them. This would stripe the data across the vdevs. Of
course, when BP-rewrite becomes available it should be possible to simply
redistribute blocks amongst the various vdevs without having to go through
destroying/creating.


On Fri, Jul 9, 2010 at 6:57 AM, George Helyar < ghelyar at gmail.com >
wrote:


I use ZFS (on FreeBSD) for my home NAS. I started on 4 drives then added 4 and
have now added another 4, bringing the total up to 12 drives on 3 raidzs in 1
pool.

I was just wondering if there was any advantage or disadvantage to spreading the
data across the 3 raidz, as two are currently full and one is completely empty.

If it would improve performance to spread the data, is there any easy way to do
it?
-- 
This message posted from opensolaris.org 
_______________________________________________ 
zfs-discuss mailing list 
zfs-discuss at opensolaris.org 
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss 



-- 
Matt Urbanowski 
Graduate Student 
5-51 Medical Sciences Building 
Dept. Of Cell Biology 
University of Alberta 
Edmonton, Alberta, Canada 
T6G 2H7 


_______________________________________________ 
zfs-discuss mailing list 
zfs-discuss at opensolaris.org 
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss 



-- 
Vennlige hilsener / Best regards 

roy 
-- 
Roy Sigurd Karlsbakk 
(+47) 97542685 
roy at karlsbakk.net 
http://blogg.karlsbakk.net/ 
-- 
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er
et element?rt imperativ for alle pedagoger ? unng? eksessiv anvendelse av
idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og
relevante synonymer p? norsk.
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+1

I badly need this.

On 09/07/2010, at 19.40, Roy Sigurd Karlsbakk wrote:
> Anyone knows where in the pipeline BP rewrite is, or how long this pipeline
is?
> 
> You could move the data elsewhere using zfs send and recv, destroy the
original datasets and then recreate them.  This would stripe the data across the
vdevs.  Of course, when BP-rewrite becomes available it should be possible to
simply redistribute blocks amongst the various vdevs without having to go
through destroying/creating.
> 
> 
> 
> 
> -- 
> Vennlige hilsener / Best regards
> 
> roy
> --
> Roy Sigurd Karlsbakk
> (+47) 97542685
> roy at karlsbakk.net
> http://blogg.karlsbakk.net/
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