On Aug 6, 2010, at 12:18 PM, Alxen4 wrote:
> Thank you very much for the answer
>
> Yea,that what I was afraid of.
>
> There is something I really cannot understand about zpool structuring...
>
> What is a role these 4 drives play in that tank pool with current
> configuration ?
They are members of a dynamic stripe. Looking at the top-level vdevs,
you have:
raidz3
disk
disk
disk
> If they are not part of raidz3 array what is a point for Solaris to accept
> that configuration ?
By default, zpool will not let you add unprotected top-level vdevs to a
protected (raidz3) top-level vdev as a dynamic stripe. To do this, you
have to also use the "-f" (force) flag.
> I realize that I made mistake by doing 'zpool add' instead of 'zpool
> attach',but still...
Yes, especially the 'zpool add -f' part.
>
> Like let's say I write data into the tank pool.How would the data to be
> distributed on the pool ? Would it go to raidz3 part of it AND to 4 stand
> alone drives or to raidz3 part only ?
The former.
> If it goes to raidz3 part only why it's not possible to remove these 4 drives
> from the pool ?
The data is unprotected. Think of the dynamic stripe as RAID-0.
> Also could you please provide some examples for multiple raidz vdevs ?
A dynamic stripe of multiple raidz vdevs looks something like:
http://hub.opensolaris.org/bin/download/Community+Group+zfs/docs/zfsadmin.pdf
page 81 (thanks Cindy!)
-- richard
--
ZFS and performance consulting
http://www.RichardElling.com
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