On 04/29/10 10:21 AM, devsk wrote:
I had a pool which I created using zfs-fuse, which is using March code base
(exact version, I don't know; if someone can tell me the command to find the
zpool format version, I would be grateful).
Try [zfs|zpool] upgrade.
These commands will tell you the current supported version and the
version of each pool/filesystem. If the command makes you nervous, run
it as a normal user!
I exported it and now I tried to import it in OpenSolaris, which is running Feb
bits because it says 134 Feb 2010 in uname output (2009-06 updated with pkg
image-update). It fails to import it because of incompatible version.
b134 will be using pool version >= 22.
Backward compatibility is a given and I know Solaris will never compromise on
that and Sun has been industry leader in that. What about forward
compatibility? I would think zfs pool format would be stable by now.
No, newer pool support newer features. Imagine the arse ache you would
experience importing a dedup poll to a system then didn't support it!
So, what happened here? I know I am going to get shouted at for saying this but
this tells me that ZFS is still not on-disk stable in the same vein as BTRFS is
not on-disk stable. But it gets better. I can mount and use BTRFS FSs which
were created after 2.6.32 (which was a long ago) in a 2.6.32 kernel i.e. I can
boot my older kernel if I need to and still access the newer FS and files in
it, without breaking anything. Of course, the newer kernels work with FSs
created in older kernels.
You can create pools and filesystems with older versions if you want
them to be backwards compatible. I have done this when I was sending
data to a backup server running an older Solaris version.
May be I am doing something wrong. May be it is just about using '-f' flag and
things will work out and nothing will break. Is it? I look fwd to guidance from
the community on this.
Post back the output of the upgrade commands an the errors you get when
importing the pool.
--
Ian.
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