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

[Petr Rockai]

Takahiro Yasui <tyasui at 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.

Yours,
   Petr.