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@xxxxxxxxxxxxxxx] 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@xxxxxxxxxxxxxxx - - VitalStream, Inc. http://www.vitalstream.com - - - - Brain: The organ with which we think that we think. - ----------------------------------------------------------------------
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