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Re: [Linux-cluster] GFS2 loses data under kernel 2.6.24...



Hi,

Does this patch fix it for you?

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=9656b2c14c6ee0806c90a6be41dec71117fc8f50

or you can just upgrade to the latest upstream Linus kernel. It was a
result of the write_end function not working in exactly the same way as
the older commit_write used to,

Steve.

On Fri, 2008-02-08 at 00:01 -0500, Glen Dosey wrote:
> I experienced this today at work on a RHEL5 system and have verified it
> today at home on Fedora 8. Perhaps I am doing something foolish ....
> 
> I have a fully patched RHEL5 x86_64 system which works fine with the Red
> Hat supplied cluster stuff, except the NFS server performance is abysmal
> (~640Mb/s NFS). After pulling my hair trying to fix NFS I decided to
> just grab the latest kernel which fixed the problem (~980Mb/s NFS). But
> it introduced another much more serious problem, which I've duplicated
> on my FC8 x86_64 system at home. 
> 
> I already have all the cman/clvmd/openais/gfs[2]-utils packages
> installed through the package manager. I downloaded kernel 2.6.24 from
> kernel.org and did a straight `make -j4 rpm ` and installed the
> resulting rpm in both instances. Both systems worked fine with
> RHEL/Fedora kernels, but here's what happens under 2.6.24
> 
> [root eclipse test]# dd if=/dev/zero of=test3.dd bs=512M count=1
> 1+0 records in
> 1+0 records out
> 536870912 bytes (537 MB) copied, 7.95285 s, 67.5 MB/s
> [root eclipse test]# ll
> total 2101312
> -rw-r--r-- 1 root root          0 2008-02-07 23:25 test2.dd
> -rw-r--r-- 1 root root  536870912 2008-02-07 23:42 test3.dd
> -rw-r--r-- 1 root root 1073741824 2008-02-07 22:54 test.dd
> [root eclipse test]# cd ..
> [root eclipse mnt]# umount /mnt/test/
> [root eclipse mnt]# mount /mnt/test/
> [root eclipse mnt]# mount | grep test
> /dev/mapper/disk00-test on /mnt/test type gfs2
> (rw,hostdata=jid=0:id=524289:first=1)
> [root eclipse mnt]# cd /mnt/test/
> [root eclipse test]# ll
> total 2101312
> -rw-r--r-- 1 root root          0 2008-02-07 23:25 test2.dd
> -rw-r--r-- 1 root root          0 2008-02-07 23:42 test3.dd
> -rw-r--r-- 1 root root 1073741824 2008-02-07 22:54 test.dd
> 
> Files that have data just go zero size after an umount and remount. I've
> tried a variety of file sizes and tried it with file containing data as
> well (not all zeros). This worked under the RHEL kernels, so is there
> something I'm doing wrong ?
> 
> Both systems are running cman and are a quorate 2 node cluster (where
> the second node doesn't exist). At work it's a 1TB shared filesystem but
> here at home it's just a local disk, so there's nothing else with any
> access to it.
> 
> If someone could maybe point out what I'm doing wrong I'd appreciate it,
> or just let me know this won't work for whatever reason. I haven't even
> touched on getting the GFS1 modules to build into this.
> 
> Thanks,
> Glen
> 
> 
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