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Re: [linux-lvm] How do you create large numbers of LVs? (In the 1000s) Is it even possible?



I think the problem you are seeing is similar to the one found in bugzilla (164198). Would you be willing to add some notes there? It will give you a place to track the progress...

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=164198

 brassow

On Jul 28, 2005, at 2:18 PM, Ming Zhang wrote:

On Thu, 2005-07-28 at 12:09 -0700, Nathaniel Stahl wrote:
We'd like to be able to create a large number of LVs (potentially
numbering in the low thousands).  I get failure after LV 226 or so,
though - "VG VolGroup01 metadata writing failed".

RedHat claims this should be possible with LVM2 on the following web page:

http://www.redhat.com/magazine/009jul05/features/lvm2/

I admit to being a little suprised at the 2^32 max LV claim - I was
figuring 2^20 as the theoretical max given 2.6's 32 bit device numbering
scheme (20 bits for minor, 12 bits for major).


The LVM2 code, at least version 2.00.25 as distributed in FC3, appears
to have a check that the minor number is strictly less than 256.
Removing this check allows for the creation of working LVs using minors
greater than 256, but LV creation fails with the error "VG VolGroup01
metadata writing failed" creating the 227th LV. Even with the minor
limit in place - I can't create more than 226 LVs.

i asked this question before. there is a hard coded limitation in lvm metadata, so the real number is like this, limited around 2xx. the limitation will be removed in near future. how near? i do not know. :)



Is there a patch that allows this limit to be broken? Should I be using
a newer version of the tools? If not currently possible, is this
something that will be in the near future?


Thanks for any help/advice you can give.

-Nate Stahl

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