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Bail0ng
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PostPosted: Wed Dec 18, 2013 12:07 pm    Post subject: fun with zfs Reply with quote

Code:

zpool create -o ashift=12 -O normalization=formD -m none kvm mirror /dev/sdg /dev/sdh
zfs create -V 50G kvm/gentoo-base


breaks kvm...
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mounty1
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PostPosted: Tue Feb 11, 2014 10:55 pm    Post subject: Re: fun with zfs Reply with quote

Bail0ng wrote:
Code:

zpool create -o ashift=12 -O normalization=formD -m none kvm mirror /dev/sdg /dev/sdh
zfs create -V 50G kvm/gentoo-base


breaks kvm...
In what way ? On what OS ? If Gentoo+FUSE, well, get yourself onto OmniOS instead if you want proper ZFS support with timely integration of upstream fixes. http://omnios.omniti.com
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Michael Mounteney
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Bail0ng
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PostPosted: Wed Feb 12, 2014 8:13 am    Post subject: Reply with quote

It's zfs on linux, and creating a zvol with the name kvm/gentoo-base creates

Code:
/dev/kvm/gentoo-base


but kvm creates itself a /dev/kvm device node, which conflicts with the zvol... So it's a simple naming issue....
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mounty1
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PostPosted: Wed Feb 12, 2014 9:38 pm    Post subject: Reply with quote

Bail0ng wrote:
but kvm creates itself a /dev/kvm device node, which conflicts with the zvol... So it's a simple naming issue....

Ah, fair point. On OmniOS, ZFS volumes are under /dev/zvol/, presumably to avoid the problem you describe.
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Michael Mounteney
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Bail0ng
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PostPosted: Thu Feb 13, 2014 8:24 am    Post subject: Reply with quote

Well, I don't understand what devices in /dev are created by zfs and why, however I have a pool called rpool with different zvols and it looks like that:

Code:

bailong@hetzner ~ $ ls -lsa /dev/
total 13
0 drwxr-xr-x 17 root root     4060 Feb  7 14:02 .
9 drwxr-xr-x 20 root root       21 Feb  6 18:13 ..
0 drwxr-xr-x  2 root root      220 Feb  7 14:02 rpool


In this directory I have the zvols:

Code:

bailong@hetzner ~ $ ls -lsa /dev/rpool/
total 0
0 drwxr-xr-x  2 root root  220 Feb  7 14:02 .
0 drwxr-xr-x 17 root root 4060 Feb  7 14:02 ..
0 lrwxrwxrwx  1 root root    7 Feb  7 14:07 mail -> ../zd80
0 lrwxrwxrwx  1 root root    7 Feb  7 14:07 mail_swap -> ../zd96


But I also have /dev/zvol:

Code:

bailong@hetzner ~ $ ls -lsa /dev/zvol/rpool/
total 0
0 drwxr-xr-x 2 root root 220 Feb  7 14:02 .
0 drwxr-xr-x 3 root root  60 Feb  6 18:13 ..
0 lrwxrwxrwx 1 root root  10 Feb  7 14:07 mail -> ../../zd80
0 lrwxrwxrwx 1 root root  10 Feb  7 14:07 mail_swap -> ../../zd96
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mounty1
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PostPosted: Fri Feb 14, 2014 12:38 am    Post subject: Nasty Reply with quote

Looks like a very silly bug in the implementation. Regrettably, the history of GNU/Linux is that what might seem like a show-stopping bug to one user can take weeks to be noticed and fixed upstream. Presumably, the fact that you are still participating in this thread shows that nearly two months after your initial post, it's still unfixed.
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Michael Mounteney
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Bail0ng
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PostPosted: Fri Feb 14, 2014 8:51 am    Post subject: Reply with quote

Well, I don't know if this is a bug, however this forum is no bug reporting tool so even if it is a bug I'd have to report it on the corresponding bugtracker. It's no show-stopping problem for me, using a different name for my zpool is an easy fix and I posted it here in case other people experience the same issue.
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ashley12
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PostPosted: Thu Apr 10, 2014 5:57 pm    Post subject: why? Reply with quote

how could i know that? On what OS ?
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