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[gentoo-cluster] clvm/lvm2/device-mapper

[Ulrich David]

Hi,

I'm quite confuse with lvm2 an clvm packages on gentoo amd64.

I have 2 xen-hosts domains0 using the same volume group (vg) including  
logical volumes (lv) for the domainsU. The physical volume is on 2 SAN  
(using raid1 lvm on logical volumes) with dual path. I use multipath- 
tools to access the right path (access are active/enabled only).

So my domains0 have 4 access on storage system (2 on each volume, one  
volume on each SAN). With multipath-tools I choose only one path per  
volume. With LVM I have created some raid1 logical volumes on the 2  
san-volumes I see on my hosts domain0. Each xen domainsU has access to  
one lvm logical volume, but I need to have these logical volumes ready  
to use on the second xen-server domain0 (for failback). So I need to  
use a locking system to use my lvm volume group on the 2 domain0, right?

If I want to install clvm, the package is masked and "flagged in read  
me" as "redondant" with lvm2. In lvm2 I can't get "clvm" flag to work  
(it is in parentheses).
My packages versions are the stables ones :
sys-fs/lvm2-2.02.36
sys-fs/multipath-tools-0.4.7-r2 (0.4.8 doesn't work)
sys-kernel/xen-sources-2.6.18-r12

Do I need clvm? What must I do to having it working?

Another question. With recent versions of lvm2, I need to uninstall  
device-mapper. How can I do it when multipath-tools depends on device- 
mapper??

Best regards

David

Re: [gentoo-cluster] clvm/lvm2/device-mapper

[Robin H. Johnson]

On Mon, Oct 19, 2009 at 03:42:16PM +0200, Ulrich David wrote:
> If I want to install clvm, the package is masked and "flagged in
> read me" as "redondant" with lvm2. In lvm2 I can't get "clvm" flag
> to work (it is in parentheses).
> My packages versions are the stables ones :
> sys-fs/lvm2-2.02.36
> sys-kernel/xen-sources-2.6.18-r12
> 
> Do I need clvm? What must I do to having it working?
There was NEVER a stable package release of sys-fs/clvm.

Correspondingly, you must use the ~arch releases of sys-fs/lvm2 for good
CLVM support.

Additionally, the clvm use flag is use.mask'd for nearly all
architectures, because nobody has tested it.
x86 is the only arch that has it unmasked:
/usr/portage/profiles/arch/x86/use.mask:-clvm

> sys-fs/multipath-tools-0.4.7-r2 (0.4.8 doesn't work)
Could you elaborate on how it doesn't work? What is your SAN hardware?

> Another question. With recent versions of lvm2, I need to uninstall
> device-mapper. How can I do it when multipath-tools depends on
> device-mapper??
Upstream LVM2 merged device-mapper into LVM2, that's why the dep has a
|| block.

-- 
Robin Hugh Johnson
Gentoo Linux: Developer, Trustee & Infrastructure Lead
E-Mail     : robbat2@gentoo.org
GnuPG FP   : 11AC BA4F 4778 E3F6 E4ED  F38E B27B 944E 3488 4E85

Re: [gentoo-cluster] clvm/lvm2/device-mapper

[Ulrich David]

Hi,

Le 19 oct. 2009 à 22:42, Robin H. Johnson a écrit :

> On Mon, Oct 19, 2009 at 03:42:16PM +0200, Ulrich David wrote:
>> If I want to install clvm, the package is masked and "flagged in
>> read me" as "redondant" with lvm2. In lvm2 I can't get "clvm" flag
>> to work (it is in parentheses).
>> My packages versions are the stables ones :
>> sys-fs/lvm2-2.02.36
>> sys-kernel/xen-sources-2.6.18-r12
>> 
>> Do I need clvm? What must I do to having it working?
> There was NEVER a stable package release of sys-fs/clvm.
> 
> Correspondingly, you must use the ~arch releases of sys-fs/lvm2 for good
> CLVM support.
> 
> Additionally, the clvm use flag is use.mask'd for nearly all
> architectures, because nobody has tested it.
> x86 is the only arch that has it unmasked:
> /usr/portage/profiles/arch/x86/use.mask:-clvm

I just need to rebound on my initial question. I now want to install lvm2 with "cluster aware" tools (clvm). I want to use a lock on my lvm volumes which could be mount by multiple hosts (but only one at a time).
I unmask clvm in the profile file of amd64. But when I install lvm2 with clvm use flag I don't have a useable clvm :

iceage0 ~ # /etc/init.d/clvmd start
 * Caching service dependencies ...
 *  Can't find service 'cman' needed by 'clvmd';  continuing...                                                                                                                                  [ ok ]
cman
 * ERROR:  Some services needed are missing.  Run
 *         './clvmd broken' for a list of those
 *         services.  clvmd was not started.
iceage0 ~ # /etc/init.d/clvmd status
 * status:  stopped

If I unmask cman, the result is :


iceage0 ~ # emerge -pv lvm2

These are the packages that would be merged, in order:

Calculating dependencies... done!

emerge: there are no ebuilds to satisfy "=sys-cluster/cman-2*".
(dependency required by "sys-fs/lvm2-2.02.51-r2" [ebuild])
(dependency required by "lvm2" [argument])

no cman-2 in portage...

I have noticed that with clvm flag, configuration option for lvm2 are :
 * econf: updating LVM2.2.02.51/autoconf/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --enable-readline --disable-selinux --enable-pkgconfig --libdir=/usr/lib64 --enable-dmeventd --enable-cmdlib --enable-applib --enable-fsadm --enable-static_link --with-mirrors=internal --with-snapshots=internal --with-lvm1=internal --with-cluster=internal --with-clvmd=none --with-pool=internal --sbindir=/sbin --with-staticdir=/sbin CLDFLAGS=-Wl,-O1

==> --with-clvmd=none is that normal?

> 
>> sys-fs/multipath-tools-0.4.7-r2 (0.4.8 doesn't work)

I have added a very "usefull" (for me) bug report for multipath-tools :
http://bugs.gentoo.org/show_bug.cgi?id=293615

multipath hangs IOs instead of marking a volume as unusable... If I unmap a volume, multipath try changing the path all the time. So a raid1 on 2 volumes is not useable.

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[Guy Harrison]