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Re: [lvm-devel] [BUG-REPORT] mirror legs in the same PV with --alloc anywhere



Hi Petr,



On Wed, 2010-05-05 at 16:13 +0200, Petr Rockai wrote:
> Takahiro Yasui <tyasui redhat com> writes:
> > On 04/23/10 17:09, brem belguebli wrote:
> >> On Fri, 2010-04-23 at 14:54 -0400, Takahiro Yasui wrote:
> >>> On 04/23/10 12:01, brem belguebli wrote:
> >>>> I've read in the RHEL 5.5 technical datasheet that the shipped LVM
> >>>> version 2.02.56 was alraedy capable of mirrored log.
> >>>
> >>> As far as I see lvm2 code, I don't think lvm2 in RHEL5.5 has
> >>> mirrored log feature. I'm not sure which document you referred to.
> >>> Could you tell me the exact name of "RHEL 5.5 technical datasheet"?
> >> 
> >> http://www.redhat.com/f/pdf/rhel/RHEL_5_5_TechOverview_wp_web.pdf
> >> page 4, LVM
> >> 
> >> " LVM ��� the Logical Volume Management storage suite has been augmented
> >> to provide hot sparing
> >>  for mirror journals, enabling automatic replacement or removal of
> >> failed logging devices.
> >> "
> >
> > Thanks for the information, but I am not sure if this sentence is
> > telling 'mirrored log.' What I can say is the lvm2-2.02.56-8 doesn't
> > have 'mirrored log' feature. I hope someone may give you a explanation...
> For all I can tell, this means that if the log fails, it is
> automatically replaced when there's a hotspare. Which is true, but it
> does not imply mirroring.
> 
I have never seen this documented anywhere, could you provide any link
to this hotspare based log replacement?
> Yours,
>    Petr.
> 
Thanks 

Brem
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