[Linux-cluster] Finding out properties of GFS formatted partition

[Christopher Probst]

Bob,

I would like to thank you for the time you took in helping me. I have implemented a GUI around what you wrote and it works fine. Thank you very much.

Christopher

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> Subject: Re: [Linux-cluster] Finding out properties of GFS formatted partition
> From: rpeterso at redhat.com
> To: linux-cluster at redhat.com
> Date: Sat, 19 Jan 2008 08:55:14 -0600
> 
> On Fri, 2008-01-18 at 18:47 +0000, Christopher Probst wrote:
>> Hello,
>> 
>> This is my first post/question on this mailing list, so I am sorry if
>> the question sound naive. I have a GFS formatted partition(dev/hdb1)
>> that is assigned to a cluster. I would like to know, if I can extract
>> the following info of a particular GFS formatted partition
>> 
>> 1) Cluster name it is assigned to
>> 2) Number of journals;
>> 3) lock method used.
>> 
>> Is there any way to do this without getting a mount point involved?
>> 
>> Thank you in advance
>> Christopher
> 
> Hi Christopher,
> 
> 1. Cluster name is easy:
>    gfs_tool sb /dev/sdb1 table
> 2. Number of journals is a bit more difficult.  If the FS is mounted
>    you can do:    gfs_tool df 
>    However, since you said "without getting a mount point involved" I'll
>    assume that it's not mounted.  You can still find out the number of
>    journals.  In RHEL5, Centos5 and equivalent, you can do this:
>    gfs2_edit -p jindex /dev/sdb1
>    (The gfs2_edit program recognizes gfs1 file systems as well as gfs2)
>    I'll warn you that the output is not very user-friendly.
> 
>    In RHEL4, Centos4 and equivalent there's no "good" way unless the
>    file system is mounted (again, use gfs_tool df).  There is a "not
>    so good" way, which is to use "gfs_edit" to poke around, but you've
>    got to know what you're doing.  You basically have to jump from the
>    superblock to the jindex and see how many entries are there.
>    Unlike gfs2_edit, gfs_edit is primitive and has no print option.
> 
>    It may not be relevant at this point in time, but for gfs2 starting
>    when RHEL5.2 is released (I think), I also added:
>    "gfs2_tool journals ".
> 3. Lock method is easy:
>    gfs_tool sb /dev/sdb1 table
> 
> Regards,
> 
> Bob Peterson
> Red Hat GFS
> 
> 
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