Re: [gentoo-server] Issues with GFS2.

["\"Todd M. Hébert\"" <todd@iil.ie>]

Brian,
I would appreciate greatly if you could send those config details.

It's really the elements around locking & fencing that seems to be causing issues. (although I don't think I really need fencing.)

Thanks in advance!

--Todd (todd at iil.ie)

Brian Kroth wrote:
> I noticed that problem once as well, but it was while issuing the "rm *" command
> on the shared space from cssh to 5 machines at once, which seems more
> understandable that you'd see a problem doing it that way.  However, it should
> be able to handle that and I haven't been able to reproduce it yet, so I
> couldn't track down what actually caused it.  I can send you my config details
> if you'd like to compare.
> 
> Brian
> 
> "Todd M. Hébert" <todd@iil.ie>:
>> Thanks Brian, there was some great info.. and even greater ebuilds.
>>
>> I've gotten things working.. but with some caveats.  Locking isn't working 
>> properly.
>>
>> I can get filesystems mounted on both servers just fine.. I can copy a file 
>> into the shared space on one server, copy it out on the other, even delete 
>> them.  (copy from a, delete from b, copy from b, delete from a.)
>>
>> BUT... as soon as I copy in several files and issue a rm /<mount-point>/*
>>
>> everything stops working for that mount. (Other mounts will continue to 
>> work until a similar command is issued)
>>
>> It appears that anything trying to access a LIST of files causes a serious 
>> problem, and everything related to the affected mount just freezes.
>>
>> The /var/log/messages file shows that it freezes because it's waiting for 
>> locks on the files to clear.
>>
>> I'm getting no compiling errors.
>>
>> Has anyone seen similar problems or even found a way to fix this?
>>
>> Thanks in advance for any further help!
>>
>> --Todd
>>
>> (P.S. please excuse the company information at the bottom.. it's required 
>> under Irish law.)
>>
>> Brian Kroth wrote:
>>> I have also been dealing with this.  There aren't any gfs2 tools in
>>> portage yet, and as I'm doing a new install I didn't want to go with an
>>> "old" gfs, especially since the kernel module doesn't work with newer
>>> kernels anymore.  I ended up writing my own ebuilds.  Have a look at these
>>> links below for more info.  The offsite link in the forum post is more up
>>> to date (better init scripts).  If you're upgrading from gfs please let me
>>> know how that goes with the new ebuilds.  I think they should work just
>>> fine, but I haven't tested it yet.
>>> Thanks,
>>> Brian
>>> http://bugs.gentoo.org/show_bug.cgi?id=184850
>>> http://forums.gentoo.org/viewtopic-p-4732772.html#4732772
>>> https://mywebspace.wisc.edu/bpkroth/web/gentoo/fs-cluster-ebuilds/fs-cluster_ebuilds.tar.bz2
>>> BTW, I long time ago I posted a question regarding OCFS2 vs. GFS2.  In my
>>> research I decided OCFS2 didn't have all the features I wanted (quotas,
>>> acls, cluster flock, etc.) but I did run some simple benchmarks of how
>>> they respond with multiple clients.  Basically just "iozone -a" on 5 
>>> machines at
>>> once.  Here's another link in case anyone's interested.  Sorry for the
>>> format, but I had a student make them "pretty" and he used MS Excel 2007.
>>> https://mywebspace.wisc.edu/bpkroth/web/fs-cluster/fs-cluster-iozone-results.xls
>>> "Todd M. Hébert" <todd@iil.ie>:
>>>> Hello all, I'm hoping someone has dealt with this by now.
>>>>
>>>> The kernel seems only to support GFS2, but the user-space tools seem to 
>>>> only support GFS (GFS1?) 
>>>> So.. I am able to format GFS filesystems in userspace, but I cannot mount 
>>>> them because the kernel doesn't understand them. (and the separate GFS 
>>>> kernel module will not compile,.. maybe because the one in the kernel 
>>>> source that handles GFS2 uses some of the same necessary bits?)
>>>>
>>>> I need to find a way to get either GFS or GFS2 working properly. (I'd 
>>>> think GFS2 would be preferable.)
>>>>
>>>> I'm using the 2007.0 profile, and I already have the cluster elements 
>>>> configured, and only need to format & mount the filesystems at this 
>>>> point.
>>>>
>>>> Can anyone point me to a resource that will help me get this last bit 
>>>> sorted?
>>>>
>>>> Thanks,
>>>>
>>>> --Todd
>>>>
>>>> (P.S. Pardon anything below this line.. it is required under Irish law. 
>>>> --TMH)
>>>>


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