It sounds like you might be the man to start this job off. Have you tried
looking for contributors/assistance on any of the other lists, like Storage,
for example? Some of the systems people might be able to give you a hand. I
don't have the skills to help you directly, but I'd like to offer
> -Aggregate data left over from previously read stripe with next stripe
> >
> > -Write new stripe in similar fashion as above
> >
> > -Update "stripe access method" address
> >
> > -Wash, rinse, repeat
> >
> > -Write relocated stripe 00 back
Hello Adam,
Tuesday, July 31, 2007, 12:06:40 AM, you wrote:
AL> How do other systems work? Do they take the pool offline while they migrate
AL> data to the new device in the RAID stripe or do they do this online? How
AL> would you propose this work with ZFS?
You can expand stripe size or change
> > You just have to add a stripe at a time rather than
> a
> > single disk at a time.
> >
> > Adam
>
> What does it mean to "add a stripe"? Does that mean
> I can add one disk or do I have to add two disks?
I expect he means adding another raid-z vdev to the zpool, i.e. more
than one disk.
Ob
o beginning of array
>
> -Remove additional logic to check for "access method" for array
>
>
> How one would perform such an operation in ZFS is left as an exercise for
> the reader :)
>
> -=dave
>
> - Original Message -
> From: "Adam L
> Do they take the pool offline while they migrate data to the new device in
> the RAID stripe or do they do this online?
I think they (readynas, drobo, Linux mdadm) can do it online, but either way,
getting the job done is what matters most. I'm talking about small consumer
systems here, so
Adding a new "stripe" refers to adding a new top level raidz vdev to
the pool. Instead of adding a single disk to an existing raidz
grouping (which isn't going to buy you much in the first place), you
add a new raidz group. Here's an example using simple file vdevs:
zion:~ root# zpool cre
> You just have to add a stripe at a time rather than a
> single disk at a time.
>
> Adam
What does it mean to "add a stripe"? Does that mean I can add one disk or do I
have to add two disks?
Thanks,
-Ryan
--
This messages posted from opensolaris.org
-
From: "Adam Leventhal"
To: "MC"
Cc:
Sent: Monday, July 30, 2007 4:06 PM
Subject: Re: [zfs-code] Raid-Z expansion
>> RAIDz does not let you do this: Start from one disk, add another disk
>> to mirror the data, add another disk to make it a RAIDz array, and
> RAIDz does not let you do this: Start from one disk, add another disk
> to mirror the data, add another disk to make it a RAIDz array, and add
> another disk to increase the size of the RAIDz array.
That's true: today you can't expand a RAID-Z stripe or 'promote' a mirror
to be a RAID-Z stripe.
On Sun, Jul 29, 2007 at 03:54:37PM -0700, Ryan Rhodes wrote:
> I want one storage pool (mount), because I don't want to navigate through
> different drives/mounts to go through my movies/music/whatever. I want to
> at least be able to add drives later of the same size and still have one
> pool.
Ju
I've read a lot of posts on this forum by people interested in using ZFS where
they would use a NAS or a home server with RAID today, and I'm sure they have
the same questions I do about expansion/recovery.
I think the use case is that we want ZFS for the transactional features and
because it d
> You can do that with ZFS today.
I appreciate what you are saying, but we are talking about different things.
RAIDz does not let you do this: Start from one disk, add another disk to
mirror the data, add another disk to make it a RAIDz array, and add another
disk to increase the size of the
> Another use case of mine is that I want to start a new storage server
> with 3 disks, but I anticipate running out of space by an unknown amount,
> so I want to be able to add a couple more disks when I need to.
You can do that with ZFS today. The conceptual difference is that
instead of growin
> As has been mentioned on this forum, this would
> require a significant change
> to the way RAID-Z works. To my knowledge there is no
> such project at present.
> Do you have a use case where this is required?
>
> Adam
>
> On Sat, Jul 07, 2007 at 03:37:19PM -0400, Echo B
> wrote:
> > Apologies
As has been mentioned on this forum, this would require a significant change
to the way RAID-Z works. To my knowledge there is no such project at present.
Do you have a use case where this is required?
Adam
On Sat, Jul 07, 2007 at 03:37:19PM -0400, Echo B wrote:
> Apologies for the blank message
Apologies for the blank message (if it came through).
I have heard here and there that there might be in development a plan
to make it such that a raid-z can grow its "raid-z'ness" to
accommodate a new disk added to it.
Example:
I have 4Disks in a raid-z[12] configuration. I am uncomfortably low o
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