[linux-lvm] vgcreate on 1.5TB volume

[linux-lvm] vgcreate on 1.5TB volume

[Austin Gonyou]

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I want to get as much of this volume useable as possible in one LV. (if
not all, I thought vgcreate -Ay -s8M would work, but I get 512MB LV max
message)


What is the best way to get all 1.5TB in one LV?

TIA
-- 
Austin Gonyou <austin@coremetrics.com>
Coremetrics, Inc.

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Re: [linux-lvm] vgcreate on 1.5TB volume

[José Luis Domingo López]

On Monday, 14 October 2002, at 16:04:32 -0500,
Austin Gonyou wrote:

> I want to get as much of this volume useable as possible in one LV. (if
> not all, I thought vgcreate -Ay -s8M would work, but I get 512MB LV max
> message)
> 
A default physical extent (PE) size of 4 MB when creating a VG gives you
a maximun LV size of 65536*4 MB = 256 GB. If you increase your PE size
by a factor of 16 (any factor multiple of two should work) you get a
maximun LV size of 16 times 256 GB, that is, 4 TB.

Current unpatched kernels for 32-bit architectures have a hard limit at
around 2 TB, so maybe you can even try with a PE size of 8 MB. The only
apparent drawback of a larger PE is LV sizes get rounded to the nearest
PE-size boundary, so you can "waste" up to PE MB for each LV.

Hope this helps (and is correct ;-)

-- 
Jose Luis Domingo Lopez
Linux Registered User #189436     Debian Linux Woody (Linux 2.4.18-586tsc)

Re: [linux-lvm] vgcreate on 1.5TB volume

[José Luis Domingo López]

On Tuesday, 15 October 2002, at 00:20:50 +0200,
Jos� Luis Domingo L�pez wrote:

> Current unpatched kernels for 32-bit architectures have a hard limit at
> around 2 TB, so maybe you can even try with a PE size of 8 MB. The only
> apparent drawback of a larger PE is LV sizes get rounded to the nearest
> PE-size boundary, so you can "waste" up to PE MB for each LV.
> 
Argh, my brain seems to have been lost somewhere between the two first
paragraphs of my earlier post. Instead of "...you can even try with a PE
size of 8 MB." I should have said "...you can even try with a PE size 8
times the size of the default (32 MB)."

So 65536*32 MB = 2 TB , just what I wanted to mean and was unable to
write in the previous post.

Sorry for the inconvenience.

-- 
Jose Luis Domingo Lopez
Linux Registered User #189436     Debian Linux Woody (Linux 2.4.18-586tsc)

Re: [linux-lvm] vgcreate on 1.5TB volume

[Steven Lembark]

> What is the best way to get all 1.5TB in one LV?

What are you using the space for? Nearly anything that would
handle that much space can divide the space up into multiple
areas (e.g., oracle tablespaces) that allow more reasonably
sized filesystems.


--
Steven Lembark                               2930 W. Palmer
Workhorse Computing                       Chicago, IL 60647
                                            +1 800 762 1582

Re: [linux-lvm] vgcreate on 1.5TB volume

[NagyZ]

On Mon, 14 Oct 2002, Steven Lembark wrote:

> 
> > What is the best way to get all 1.5TB in one LV?
> 
> What are you using the space for? 

> Nearly anything that would
> handle that much space can divide the space up into multiple
> areas (e.g., oracle tablespaces) that allow more reasonably
> sized filesystems.

glftpd.. :)
i have nearly 2TB VG..

we planning to upgrade some drivers.. is there any way to get more than 
2TB as max? i need ~8-10TB.. is there any way to do that?

thnx

NagyZ

Re: [linux-lvm] vgcreate on 1.5TB volume

[Austin Gonyou]

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Sorry for the late response. This will be a backup/software mirroring
volume for our large DB.


On Mon, 2002-10-14 at 19:40, Steven Lembark wrote:
> > What is the best way to get all 1.5TB in one LV?
> 
> What are you using the space for? Nearly anything that would
> handle that much space can divide the space up into multiple
> areas (e.g., oracle tablespaces) that allow more reasonably
> sized filesystems.
> 
> 
> --
> Steven Lembark                               2930 W. Palmer
> Workhorse Computing                       Chicago, IL 60647
>                                             +1 800 762 1582
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
-- 
Austin Gonyou <austin@coremetrics.com>
Coremetrics, Inc.

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Re: [linux-lvm] vgcreate on 1.5TB volume

[Austin Gonyou]

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I ended up having to do vgcreate -s32M, that got me a 2TB LV Max. 

ALso, there is an issue which I'd like to discuss here on this list. It
is about LVM1 and kernel stack clobbering. It's pretty terrible, and all
roads, so far, seem to point at LVM.

Austin

On Mon, 2002-10-14 at 19:40, Steven Lembark wrote:
> > What is the best way to get all 1.5TB in one LV?
> 
> What are you using the space for? Nearly anything that would
> handle that much space can divide the space up into multiple
> areas (e.g., oracle tablespaces) that allow more reasonably
> sized filesystems.
> 
> 
> --
> Steven Lembark                               2930 W. Palmer
> Workhorse Computing                       Chicago, IL 60647
>                                             +1 800 762 1582
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
-- 
Austin Gonyou <austin@coremetrics.com>
Coremetrics, Inc.

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