[Linux-cluster] GFS and Storage greater than 2 TB

[Markus Miller]

For what I read, the maximum device size with kernel 2.6 is 16 TB.

-----Mensaje original-----
De: Jacob Joseph [mailto:jmjoseph at andrew.cmu.edu]
Enviado el: Friday, January 01, 2005 3:57 AM
Para: linux clustering
Asunto: Re: [Linux-cluster] GFS and Storage greater than 2 TB


Does this limit still exist with the cvs GFS on a 2.6 kernel?

-Jacob

Markus Miller wrote:
> Thank you for the answer. That is all I needed to know.
> 
> -----Mensaje original-----
> De: Rick Stevens [mailto:rstevens at vitalstream.com]
> Enviado el: Thursday, December 30, 2004 5:03 PM
> Para: linux clistering
> Asunto: Re: [Linux-cluster] GFS and Storage greater than 2 TB
> 
> 
> Markus Miller wrote:
> 
>>Hi,
>>
>>researching I found a posting to this list made by Kevin Anderson (Date: Tue, 19 Oct 2004 17:56:24 -0500) where he states the following:
>>
>>---snip---
>>Maximum size of each GFS filesystem for RHEL3 (2.4.x kernel) is 2 TB,
>>you can have multiple filesystems of that level.  So, to get access to
>>10TB of data requires a minimum of 5 separate filesystems/storage
>>combinations.
>>---snip---
>>
>>What do I have to do to achive this? Do I have to configure several GFS clusters in the cluster.ccs file (each of a máximum size of 2 TB)? Or do I have to configure one GFS cluster with serveral filesystems each with a maximum size of 2 TB? The GFS Admin Guide is not very precise, but what's really confusing me is the statement on page 12: "2 TB maximum, for total of all storage connected to a GFS cluster."
>>
>>At the moment we are evaluating to buy servers and storage, therefore I do not have any equipment to do the testing myself. 
>>
>>Any coment is highly apreciated.
> 
> 
> It's the GFS filesystem that has the limit (actually, it's the 2.4
> kernel).  Essentially, "gfs_mkfs" can only handle a maximum of 2TB.
> 
> What he means above is that you have to have five separate partitions
> of 2TB each and each with a GFS filesystem on them.  You have to mount
> those five filesystems separately.  If you're using VG/LVM, with a VG
> as "vggroup" and LVs in that group as "test1" through "test5":
> 
> 	mount -t gfs /dev/mapper/vggroup-test1 /mnt/gfs1
> 	mount -t gfs /dev/mapper/vggroup-test2 /mnt/gfs2
> 	mount -t gfs /dev/mapper/vggroup-test3 /mnt/gfs3
> 	mount -t gfs /dev/mapper/vggroup-test4 /mnt/gfs4
> 	mount -t gfs /dev/mapper/vggroup-test5 /mnt/gfs5
> 
> How you use them after that is up to you.  Just remember that a given
> GFS filesystem under kernel 2.4 is limited to 2TB maximum
> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
> - VitalStream, Inc.                       http://www.vitalstream.com -
> -                                                                    -
> -        Brain:  The organ with which we think that we think.        -
> ----------------------------------------------------------------------
> 
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