RE: Global Filesystem Limits

["Markus Miller" <mmiller cruzverde cl>]

Hi Ben,

you right, Kernel 2.6 sopports much larger devices, but it will take more than a couple of weeks unitl oracle certifies its database on RH 4. I also do not know if GFS will be awailable right away for RH 4.

Anyway, if there would be only a limitation of 2 TB per device and if I could use serveral GFS in our cluster it would be ok. But if I could use only 2 TB as a total for the GFS Server, this would be fatal.

So, does anybody have any experience with GFS and large storage?

Thanks and regards,
Markus

-----Mensaje original-----
De: Benjamin J. Weiss [mailto:benjamin birdvet org]
Enviado el: Wednesday, December 29, 2004 6:01 PM
Para: General Red Hat Linux discussion list
Asunto: Re: Global Filesystem Limits


Markus Miller wrote:

>Hi,
>
>we are going to buy a new database cluster. The two servers will be connected to a Dell CX700 (EMC Clarion) with about 4 TB of available storage. We want to uses Red Hat Global File System to avoid using RAW device. 
>
>Reviewing the GFS Admin Guide on page 12 it says:
>---snip---
>2 TB maximum, for total of all storage connected to a GFS cluster. Linux 2.4 kernels do not support devices larger than 2 TB; therefore the total size of storage available to GFS cannot exceed 2 TB.
>---snip---
>
>I did some research in Internet and definitely the Kernel 2.4 does not sopport devices larger than 2 TB. This makes me think that each LUN presented to the server must be smaller than 2 TB and I would suppose that I could create various GFS with sizes smaller than 2 TB. Is that correct, or does the capacity of the storage itself has to be smaller than 2 TB to be used by GFS?
>
>  
>
Why not wait for a couple of weeks?  RHEL 4 is in beta, and it uses the 
2.6 kernel.  I don't know what it's max device size is, but I know that 
it's bigger than 2TB.

Ben

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