Re: [Xen-API] xcp-xapi devscan.py kernel support

[George Shuklin <george.shuklin@xxxxxxxxx>]

You should be 146% sure no other hosts will access storage in that case. 
If some background process (f.e. VHD coalesing) will collide with others 
hosts activity on SR, you will trash some random peice of data (may be 
including LVM metadata).
17.01.2013 22:34, Andrey ÐÐÑÐÑ:
> Thank you for the patch, will try to apply it.
>
> In our configuration we don't need shared lvm SR because we have one 
> server with dual-path directly attached  P2000 SAN. I also have 
> configured multipath for the LUNs. So may be we can create local LVM 
> SR then for the multipath devices?
> 17.01.2013 18:19, Simon Beaumont ÐÐÑÐÑ:
> > > -----Original Message-----
> > > From: xen-api-bounces@xxxxxxxxxxxxx 
> > > [mailto:xen-api-bounces@xxxxxxxxxxxxx] On
> > > Behalf Of Andrey
> > > Sent: 17 January 2013 12:56 PM
> > > To: xen-api@xxxxxxxxxxxxx
> > > Subject: [Xen-API] xcp-xapi devscan.py kernel support
> > >
> > > I installed xcp-xapi on the Debian Wheezy and can't get LVMoHBA to 
> > > work:
> > > stderr: Traceback (most recent call last):
> > >     File "/usr/lib/xcp/sm/LVMoHBASR", line 220, in <module>
> > >       SRCommand.run(LVHDoHBASR, DRIVER_INFO)
> > >     File "/usr/lib/xcp/sm/SRCommand.py", line 261, in run
> > >       sr = driver(cmd, cmd.sr_uuid)
> > >     File "/usr/lib/xcp/sm/SR.py", line 136, in __init__
> > >       self.load(sr_uuid)
> > >     File "/usr/lib/xcp/sm/LVMoHBASR", line 94, in load
> > >       print >>sys.stderr,self.hbasr.print_devs()
> > >     File "/usr/lib/xcp/sm/HBASR.py", line 224, in print_devs
> > >       self._init_hbadict()
> > >     File "/usr/lib/xcp/sm/HBASR.py", line 61, in _init_hbadict
> > >       dict = devscan.adapters(filterstr=self.type)
> > >     File "/usr/lib/xcp/sm/devscan.py", line 168, in adapters
> > > glob.glob(os.path.join(path,"device","block:*"))[0]).split(':')[1]
> > > IndexError: list index out of range
> > >
> > >
> > > Can you please send devscan.py patch to support lvmohba in kernel 3.X.
> > I have attached the patch in question. It uses the right sysfs paths 
> > after detecting the kernel version. It might not apply to your 
> > version but it may help you make the change you require.
> > > Also will in this case other lvmohba features will work smoothly in 
> > > that case
> > > on Debian, especially multipath?
> > It's unlikely you'll get LVM to work with your setup since we use a 
> > patched version that accepts another option (--master) which affords 
> > us a different locking mechanism to allow shared SRs. This option 
> > doesn't exist in the upstream Debian LVM.
> > It may(!) be possible to get it to work if you remove the --master 
> > option from the calls to lvm in the source and ensure that you are 
> > only using these SRs in single-host pools. Again, your mileage may vary.
> > Hope this helps,
> >
> > -Si
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