Date: Tue, 1 Mar 2016 11:38:09 +0100 From: =?UTF-8?Q?Gustau_P=c3=a9rez?= <gustau.perez@gmail.com> To: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com>, FreeBSD XEN <freebsd-xen@freebsd.org> Subject: Re: Porting the block-iscsi hotplug script Message-ID: <56D57110.2060406@gmail.com> In-Reply-To: <56D434FC.8030905@citrix.com> References: <553DEB97.5000300@entel.upc.edu> <5540A053.4080409@entel.upc.edu> <5540F3FC.80606@citrix.com> <5541FC8A.8080009@citrix.com> <5542365D.10403@entel.upc.edu> <55423ECD.6000404@citrix.com> <5556F21D.2050005@entel.upc.edu> <555EEFBA.5080902@citrix.com> <555EF542.3090002@citrix.com> <555F9B3F.1000600@entel.upc.edu> <55602512.1090702@citrix.com> <56C6FA2F.8040900@gmail.com> <56CAC8CB.8030107@gmail.com> <56CADEDA.4050007@citrix.com> <56CB0057.1060509@gmail.com> <56CB041E.1020009@citrix.com> <56CB2D90.5080809@gmail.com> <56CB34BA.6060809@citrix.com> <56CC24BD.6050609@gmail.com> <56CC32E5.5010101@citrix.com> <56CC7637.3080408@gmail.com> <56CF5668.6090605@citrix.com> <56D0091F.80408@gmail.com> <56D02863.7040100@citrix.com> <56D03D95.9090509@gmail.com> <56D04E5F.8070901@citrix.com> <56D42A28.8050701@gmail.com> <56D434FC.8030905@citrix.com>
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El 29/02/16 a les 13:09, Roger Pau Monné ha escrit:
> As we spoke previously, HVM domains don't support hotplug scripts. Or
> are you trying to get them to work? (ie: you have performed other
> changes in order to enable this?)
You're completely right about the HVM domain support for hotpluging.
The thing, when I first tried xen to see if it was stable, I did the
test with an HVM domain and xen complained about the block script not
being available. So I assumed that even the domain was an HVM, the
hotplug was being called.
>> * I see the device has a type (phy, file, iscsi) in the definition of
>> the domain, but I'm not sure how to check its type in the block
>> script (I can check if the file is a block device or a regular file,
>> but what about iscsi?, check if the target param is set?)
> This is confusing, and refers to the backend that's used to handle the
> disk. In your case backend in always 'phy', which means blkback. The
> 'phy' backend is the only one that supports hotplug scripts.
>
> In the past, some prefixes (like iscsi) where shortcuts for block
> scripts, so the line:
>
> iscsi:<iscsi params>
>
> Was equivalent to:
>
> script=block-iscsi,target=<iscsi params>
>
> This is not recommended anymore, so just forget about the prefixes.
Thank you for the explanation. I would said to me this may some some
love, but perhaps I'm wrong.
>> * Also. I have a domain defined with two disks. In the block script I
>> try to execute xenstore-ls and I'd expect to see two disks there,
>> but there's only the first one. I assume this is because the block
>> script is called for each disk in the domain definition
> Yes, the block script is called for each disk, the first argument (the
> xenstore backend path) is going to be different for each invocation.
I'd assume this would lead to two different branches (or paths) in
the xenstore tree.
>
>> Finally, I ended having a disk defined in the xenstore
>> (/var/db/xenstore) which I can't remove. I removed xen-tools and removed
>> /var/db/xen{store} but it keeps complaining. I'd have expected that the
>> store was under /var/db/ but perhaps I'm missing something.
> Weird, you should be able to remove the disk entries in xenstore by
> using xenstore-rm <xenstore-path>. Rebooting the host will also
> completely clear the xenstore database. Can you paste the error message
> that you are seeing?
>
I tried deleting the xen-tools package and then deleting
/var/db/xen*. After that I rebooted (there was two xenstore processes,
I'd say one is the kernel side process and the other the user space
process, whose binary is installed by the xen-tools port). Finally I
installed the xen-tools. But the error remains. The error can be found
at [1].
I know this is an HVM domain, but I would say those are two
completely unrelated problems.
Thanks for your support,
Gustau
[1] http://pastebin.com/2xa2g0wx
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