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Re: ext3 filesystem corruption - more info



Hi -

I did answer but forgot to cc all, apologies.
Here's the communication I had with Andreas Dilger ....
Andreas Dilger wrote:
On Apr 11, 2006  14:25 -0400, Sev Binello wrote:
  
Does this imply you have a 6TB ext3 filesystem?
      
 No, it is divided into 6 filesystems, the largest ~ 1.8TB
    

I wouldn't exactly trust the 2.4 kernel for devices larger than 2TB.
Some SCSI drivers also had problems over 2TB due to signed/unsigned
issues.  Is the 6TB of storage split into < 2TB LUNs by the hardware,
or is it a single 6TB block device (with CONFIG_LBD) that is partitioned
by Linux?  The latter case would be in "not very well tested" waters.

  
The 6TB are split on the raid hardware into 6 LUNS.
So Linux sees them as devices smaller than 2TB,

Would it be a problem if the two 1.8TB systems appeared on one host ?

Thanks
-Sev


Damian Menscher wrote:
I've seen similar errors when attempting to have a >2TB filesystem on a 32-bit RHEL3 machine.  We have since implemented a 3.5TB filesystem on a 64-bit RHEL4 machine.

It would help if you could answer the question Andreas Dilger posed:

"Does this imply you have a 6TB ext3 filesystem?"

Damian

On Wed, 12 Apr 2006, Sev Binello wrote:


Hi -

In case this helps,
we got the following messages from EXT3 before the filesystem went
Does anyone recognize these.....

//seems to mount okay
   Mar 25 17:52:30 acnlin82 kernel: EXT3 FS 2.4-0.9.19, 19 August 2002 on sd(8,33),
internal journal
   Mar 25 17:52:30 acnlin82 kernel: EXT3-fs: recovery complete.
   Mar 26 00:04:01 acnlin82 kernel: EXT3-fs: mounted filesystem with ordered data
mode.

//soon as nfs clients start get a TON of errors like this
Mar 26 00:07:19 acnlin82 kernel: EXT3-fs error (device sd(8,49)): ext3_free_blocks:
Freeing blocks not in datazone - block =    3443589120, count = 1
Mar 26 00:07:19 acnlin82 kernel: EXT3-fs error (device sd(8,49)): ext3_free_blocks:
Freeing blocks not in datazone - block = 2113834232, count = 1
Mar 26 00:07:22 acnlin82 kernel: EXT3-fs error (device sd(8,49)): ext3_free_blocks:
bit already cleared for block 49125

//interspersed with some of these
Mar 26 00:10:56 acnlin82 kernel: attempt to access beyond end of device
Mar 26 00:10:56 acnlin82 kernel: 08:31: rw=0, want=1891463980, limit=1722264358
Mar 26 00:10:56 acnlin82 kernel: attempt to access beyond end of device
Mar 26 00:10:56 acnlin82 kernel: 08:31: rw=0, want=1824250576, limit=1722264358
Mar 26 00:10:56 acnlin82 kernel: attempt to access beyond end of device

Then we had to reboot and basically filesystem is shot

Thanks
-Sev

Sev Binello wrote:
      Hi -

         We have had 3 rather major occurances of ext3 filesystem corruption
      lately,
         i.e. so bad we couldn't event mount, and fsck didn't help.

         I am looking for pointers, that could help us investigate the root
      cause.

         In general...
           We are running  RedHat WS 3 Update 6,   2.4.21-40.2.ELsmp or
      2.4.21-37.ELsmp

         We have a small SAN  system that looks like this
                    3 NFS servers each containing 2 Qlocic hba's connected to 2
      qlogic switches
               connected to an nstor (now xyratex) 6TB raid system containing 2
      (active-active) controllers.

       On the first 2 occasions one of the controllers was failed over.
       On a 3rd occasion both SAN  switches lost power, and the hosts and raid
      lost communication.


       On all occasions the qlocic failover driver tried to start up on the
      alternate HBA.

       On the first 2 instances we sort of tried to blame the controller.
       On the 3rd, that was harder to do since the raid system and the hosts
      stayed up
       but lost communication.

       I can provide more detail if anyone as any info on how to proceed.

      Thanks
      -Sev



 --
Sev Binello
Brookhaven National Laboratory
Upton, New York
631-344-5647
sev bnl gov



Damian Menscher


-- 

Sev Binello
Brookhaven National Laboratory
Upton, New York
631-344-5647
sev bnl gov

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